The Growth of Oreochromis niloticus (2.6g initial average size) was studied in 100m2 earthen ponds for 180 days under tropical field environment. Varying fertilizing regimes consisting of Pennisetum purpureum (PP) and Musa sapientum (MS), two locally available weedy grasses were applied in duplicates in the experimental ponds, at the rate of 0.1-0.2 kg dry matter per m2 per day. Water quality parameters were monitored bimonthly between 8:00am-9:00am . Final average fish weight varied significantly (p<0.05) as follows: 43.85g, 35.5g, 59.5g, 24.9g and 50g, 2 respectively for PP, MS, MS+PP, T0 and T1. Corresponding daily growth were 2.2g/d, 0.1g/d, 0.3g/d, 0.1g/d and 0.2g/d. Survival rate equally varied significantly as follow: 60 %, 67 %, and 98 %, 70 % and 97 % respectively. During the study period, the results indicated the water quality were permissibole limits and can be used for livestock of Oreochromis niloticus .
This research was done in Pelabuhan Ratu Bay, about 60 km South Sukabumi Regency. The aim of this study is to determine the suitable area for floating net cage culture that can be developed. The method used in this study is spatial analysis using GIS technique. The data used include secondary and primary data from 2007 until 2008. Spatial analysis result shows, about 8,500 ha of location is suitable for the development of floating net cage culture or about 98% of the total research region worked.
Length-weight models and condition factors of fishes from Okpara Stream, Ouem...AI Publications
Length frequency distributions, length-weight models and condition factors of 21 dominant fish species of the Okpara stream (Oueme River) were examined in Northern-Benin in order to evaluate the well-being of these fish taxa. Samplings were made monthly from December 2015 to May 2017 with seines, gill nets hawks and a total of 9,302 individuals were collected. Fish abundance ranged from 53 individuals for Mormyrus rume to 2,818 for Hemichromis fasciatus. Standard length (SL) varied from 1.2 cm (Coptodon guineensis) to 51.8 cm (Chrysichthys nigrodigitatus). Length-weight regressions equations showed significant (p < 0.05) correlation coefficients (r) ranging between 0.4664 and 0.9949 with slopes (b) between 2.2262 and 3.7703 corresponding to isometric, positive allometric and negative allometric growths displayed by 4, 8 and 9 species, respectively. Condition factors K varied between 0.17 - 29.38 and species with higher well-being were Oreochromis niloticus with K=29.38, Hyperopisius bebe (K=20.14), Coptodon zillii (K=19.25), Mormyrus rume (K=17.13) and Sarotherodon galilaeus multifasciatus (K=16.16). A sustainable exploitation of these fishes requires an ecosystem restoration scheme including habitat protection, species conservation and an ecological follow-up of the Okpara stream.
This study aims to analyze the influence of physical and chemical factors on the
existence of Kurau Fish (Eleutheronema tetradactylum) in the Maro River Estuary of
Merauke Regency. Data collection was carried out by measuring the environmental
parameters directly, namely temperature, salinity and pH, while the fish catch data of
Kurau was obtained by calculating directly the number of catches per trip with the data
amount of 34 data. Environmental factor data and catch results were tested statistically
using regression models. The results showed that environmental factors that influence
the presence of Kurau Fish in the Maro River Estuary are water temperature and
salinity.
Oral Administration of Pulverized Wood Charcoal on Growth, Feed Utilization, ...ijtsrd
A 35 day feeding experiment was conducted to evaluate the effects of pulverized wood charcoal PWC on the growth, feed utilization, survival and waste excretion of red tilapia Oreochromis sp. . Ninety red tilapias with an initial weight of 7.32 ± 1.31 g were acclimatized and randomly introduced into 9 aquaria in 3 groups with 10 fish per aquarium. Different levels of PWC 0 T0 , 1 T1 , and 2 T2 were incorporated in the diets of red tilapia for four weeks. After the experiment, average body weight ABW , specific growth rate SGR , relative growth rate RGR weight gain WG , feed conversion ratio FCR and survival rate SR of the experimental fish were computed. No significant differences were observed on feed utilization, survival, and waste excretion of the fish. Furthermore, ABW and WG of the experimental fish did not show any significant difference, however, significantly higher P 0.05 SGR and RGR were observed from T1 compared to the other treatments. Consequently, this study showed that supplementation of 1 PWC in the diet is the most suitable in improving the growth performance of red tilapia. Jaypee. S. Samson ""Oral Administration of Pulverized Wood Charcoal on Growth, Feed Utilization, Survival and Waste Excretion of Red Tilapia (Oreochromis Sp)"" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-4 , June 2019, URL: https://www.ijtsrd.com/papers/ijtsrd23724.pdf
Paper URL: https://www.ijtsrd.com/biological-science/allied-sciences/23724/oral-administration-of-pulverized-wood-charcoal-on-growth-feed-utilization-survival-and-waste-excretion-of-red-tilapia-oreochromis-sp/jaypee-s-samson
This research was done in Pelabuhan Ratu Bay, about 60 km South Sukabumi Regency. The aim of this study is to determine the suitable area for floating net cage culture that can be developed. The method used in this study is spatial analysis using GIS technique. The data used include secondary and primary data from 2007 until 2008. Spatial analysis result shows, about 8,500 ha of location is suitable for the development of floating net cage culture or about 98% of the total research region worked.
Length-weight models and condition factors of fishes from Okpara Stream, Ouem...AI Publications
Length frequency distributions, length-weight models and condition factors of 21 dominant fish species of the Okpara stream (Oueme River) were examined in Northern-Benin in order to evaluate the well-being of these fish taxa. Samplings were made monthly from December 2015 to May 2017 with seines, gill nets hawks and a total of 9,302 individuals were collected. Fish abundance ranged from 53 individuals for Mormyrus rume to 2,818 for Hemichromis fasciatus. Standard length (SL) varied from 1.2 cm (Coptodon guineensis) to 51.8 cm (Chrysichthys nigrodigitatus). Length-weight regressions equations showed significant (p < 0.05) correlation coefficients (r) ranging between 0.4664 and 0.9949 with slopes (b) between 2.2262 and 3.7703 corresponding to isometric, positive allometric and negative allometric growths displayed by 4, 8 and 9 species, respectively. Condition factors K varied between 0.17 - 29.38 and species with higher well-being were Oreochromis niloticus with K=29.38, Hyperopisius bebe (K=20.14), Coptodon zillii (K=19.25), Mormyrus rume (K=17.13) and Sarotherodon galilaeus multifasciatus (K=16.16). A sustainable exploitation of these fishes requires an ecosystem restoration scheme including habitat protection, species conservation and an ecological follow-up of the Okpara stream.
This study aims to analyze the influence of physical and chemical factors on the
existence of Kurau Fish (Eleutheronema tetradactylum) in the Maro River Estuary of
Merauke Regency. Data collection was carried out by measuring the environmental
parameters directly, namely temperature, salinity and pH, while the fish catch data of
Kurau was obtained by calculating directly the number of catches per trip with the data
amount of 34 data. Environmental factor data and catch results were tested statistically
using regression models. The results showed that environmental factors that influence
the presence of Kurau Fish in the Maro River Estuary are water temperature and
salinity.
Oral Administration of Pulverized Wood Charcoal on Growth, Feed Utilization, ...ijtsrd
A 35 day feeding experiment was conducted to evaluate the effects of pulverized wood charcoal PWC on the growth, feed utilization, survival and waste excretion of red tilapia Oreochromis sp. . Ninety red tilapias with an initial weight of 7.32 ± 1.31 g were acclimatized and randomly introduced into 9 aquaria in 3 groups with 10 fish per aquarium. Different levels of PWC 0 T0 , 1 T1 , and 2 T2 were incorporated in the diets of red tilapia for four weeks. After the experiment, average body weight ABW , specific growth rate SGR , relative growth rate RGR weight gain WG , feed conversion ratio FCR and survival rate SR of the experimental fish were computed. No significant differences were observed on feed utilization, survival, and waste excretion of the fish. Furthermore, ABW and WG of the experimental fish did not show any significant difference, however, significantly higher P 0.05 SGR and RGR were observed from T1 compared to the other treatments. Consequently, this study showed that supplementation of 1 PWC in the diet is the most suitable in improving the growth performance of red tilapia. Jaypee. S. Samson ""Oral Administration of Pulverized Wood Charcoal on Growth, Feed Utilization, Survival and Waste Excretion of Red Tilapia (Oreochromis Sp)"" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-4 , June 2019, URL: https://www.ijtsrd.com/papers/ijtsrd23724.pdf
Paper URL: https://www.ijtsrd.com/biological-science/allied-sciences/23724/oral-administration-of-pulverized-wood-charcoal-on-growth-feed-utilization-survival-and-waste-excretion-of-red-tilapia-oreochromis-sp/jaypee-s-samson
Evaluation of the oyster farming potential of the Cintra bay (southern Morocco)Origins publication
The bay of Cintra is a marine ecosystem located in the southern Moroccan Atlantic known for its
biological richness and therefore for its high fishery productivity. This bay was chosen as a new destination for the
development of aquaculture in the southern regions of Morocco. To highlight its potential in terms of oyster
farming, a first rearing trial of triploid cupped oysters (Crassostrea gigas) as well as parallel monitoring of the
phytoplankton population and ecological parameters were undertaken. The results obtained showed that the oysters
adapt well to the conditions of the new environment where mortality was negligible, or even absent after a month
of launching. In terms of biological performance, the growth of individuals is continuous during the annual cycle
and after eight months the weight could reach 30.5 g which is a minimum weight for marketing. The AFNOR and
Lawrence and Scott indices showed a good physiological state and a better commercial quality of the oysters. The
filling rate of these oysters, with an average weight of 39.7g when lifting, is very high according to the Lawrence and
Scott index (126.3) and the average AFNOR index (around 21.8) rank them in the “Special” category.
This study is an attempt to understand the population characteristics such as Length-weight relationships, age, growth, mortality, length at age and exploitation rate of Frigate tuna, Auxis thazard occurring in the North west coast of India. The data collected from various fish landing centers from 2008 to 2012 were considered for this study. The mean fork length and weight 32.35 cm and 1.040 kg were observed respectively. The length-weight relationship W=2.4321x10-1 FL 2.27658, and r2 0.9576 was obtained. The value of ‘b’ found to be less than 3 and hence this species is showing negative allometric growth. The growth parameters on von Bertalanffy for L∞ estimated as 47.03, K was 1.30 and to was -0.23. The Phi-prime value (⏀) of 3.33 was derived. The length at age observed at the end of 1 to 4 years was 27.0, 42.0, 50.0 and 55.0 cm year-1 respectively. The natural mortality (M) 1.00 year-1, total mortality (Z) of 4.43 year-1 and fishing mortality (F) 3.43 year-1 were derived with the mean temperature of 27°C. The exploitation ratio(E) and exploitation rate(U) was 0.77. The results derived in the present study with regard to population characteristics of frigate tuna in the coastal waters of North west coast of India indicate catching of this species in the area to be minimized Key-words- Length-weight relationships, Mortality, Length at age, Exploitation ratio, Exploitation rate
Assessment on Accumulation of Heavy Metals and its Effect on Liver Tissues of...ijtsrd
Heavy metal pollution is a very serious issue in the present world and is caused by release of toxic substances from industrial and domestic sources into the sea water leading to harm marine organisms. Marine fishes are commonly consumed for its nutritional benefits and thus lead to transfer toxic metals into the food chain. Harpodon nehereus is a common and local fish from west coast of Maharashtra with high consumption rate among local population. Fish organs particularly liver being major site of detoxification shows structural alterations on exposure to pollution stress from their surrounding environment. Histopathological examination provides an indication of organ impairment to evaluate the health status of selected fish and the degree of pollution in marine environment. The present research effort was done to evaluate the concentration of heavy metals and to study histopathological alterations in liver tissues of largely consumed fish Harpodon nehereus collected from Sassoon dock, west Coast of Maharashtra, India. The research was carried out during the post-monsoon season of the year. High accumulation of lead 11.8 ± 8.34 mg kg , copper 20.46 ± 11.06 mg kg and Zinc 286.26 ± 114.5 mg kg were observed in liver tissues. Further histopathological study of present investigation reveals heavy damages in liver tissues of Harpodon nehereus representing that the selected fish is under high threat of pollution stress. Archana Oza | Leena Muralidharan "Assessment on Accumulation of Heavy Metals and its Effect on Liver Tissues of Harpodon Nehereus from Mumbai Coast of Maharashtra, India" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-2 , February 2019, URL: https://www.ijtsrd.com/papers/ijtsrd20250.pdf
Paper URL: https://www.ijtsrd.com/biological-science/zoology/20250/assessment-on-accumulation-of-heavy-metals-and-its-effect-on-liver-tissues-of-harpodon-nehereus-from-mumbai-coast-of-maharashtra-india/archana-oza
Application of analytical techniques to preserve the biodiversity and ecologi...CIFOR-ICRAF
Presented by Dr. Tran Thi Nhu Trang, Faculty of Environmental and Food Engineering, NTTU, on 10 November 2020 at "International workshop: Enhancing wetland management and sustainable development"
Prezentare la THE FIFTH ANNUAL ZOOLOGICAL CONGRESS OF "GRIGORE ANTIPA" MUSEUM 20-23 November 2013 "Ion Heliade Rădulescu" Amphitheatre of the Romanian Academy, Bucharest, Romania
Environmental conditions and zooplankton community structure in five ponds in...Innspub Net
The degradation of surface water quality in Cameroon is linked to the absence of a functional waste management strategy. For such a strategy to be efficient, a general understanding of aquatic ecosystems will be of importance, these management strategies are particularly lacking in the eastern part of the country. To better understand and appreciate the ecosystems in the town of Bertoua, five ponds where chosen for the physicochemical and zooplankton communities analysis. Sampling on these ponds was conducted from March 2016 to April 2017 on a monthly basis. Samples for physicochemical analysis were collected at 20cm below water surface at the middle of each pond and measured were done following the recommendations of Rodier and Alpha. Biological samples were collected by filtering 50 liters of water through a 64µm mesh opening sieve. Identification was done using standard methods and identification keys. One-way ANOVA analysis was conducted to assess the potential differences between the different ponds base monthly observations. Although they are all hypereutrophic, with regard to the values of the physicochemical parameters, the five ponds showed no significant difference between them but, the structure of the zooplankton community remains very diverse. 118 zooplankton species have been identified in the five ponds. The distribution of zooplankton in these hydrosystems was mainly governed by the presence of organic matter. This study sheds light on the status and biological diversity of ponds in eastern Cameroon, data on which to rely to develop management strategies.
Distribution of zooplankton community in Toli shad (Tenualosa toli) habitats,...AbdullaAlAsif1
Distribution of zooplankton community in Toli shad (Tenualosa toli) habitats, Sarawak, Malaysia. Biodiversitas 21: 4022-4033. The river ecosystems of Sarawak has been identified as important-spawning ground for economically important Toli shad (Tenualosa toli) fisheries. In these river ecosystems, zooplankton serves as a secondary producer to the different types of fish larvae including Toli shad. The productivity and biomass of zooplankton are important factors to control the production of higher trophic level organisms like fish larvae and fishes in different stages including T. toli larvae. In this viewpoint, the composition and abundance of zooplankton were investigated at 5 (five) sampling stations (considered to be spawning and nursing areas of Toli shad) at Batang Lupar and Batang Sadong estuaries from July 2016 to June 2017. A total of 29 zooplankton taxa were recorded that belong to 14 major groups comprised of Copepoda (Arthropoda), Crustacean nauplii (Arthropoda), Fish larvae (Chordata), Mollusca (Mollusca), Luciferidae (Arthropoda), Cnidaria (Cnidaria), Ostracoda (Arthropoda), Cirripedia (Arthropoda), Polychaete larvae (Annelida), Chaetognatha (Chaetognatha), Appendicularia (Chordata), Amphipoda (Arthropoda), Echinodermata larvae (Echinodermata) and Cladoceran (Arthropoda). Copepod was dominant group of zooplankton (82.40-94.41%) at all stations, contributing 477.37-25921.89 ind/m3 and 88.38% of total abundance. The second highest was crustacean larvae (2.45-9.38%) in all stations, contributing 0-2391.7 ind/m3 and 5.88% of total abundance. Zooplankton abundance was higher at downstream station 1 (8460.72 ind/m³) followed by station 2 (5479.80 indi/m³), station 3 (4571.95 ind/m³), station 4 (4394.20 ind/m³) and upstream station 5 (4156.73 ind/m³). Canonical Correspondence Analysis showed that the abundance of copepods was highly influenced by total turbidity and nitrate in the riverine and estuarine ecosystems. Abundance of zooplankton was relatively higher (9549.31 ind/m³) during the post-monsoon and lower (3534.56 ind/m³) during the southwest monsoon.
Abundance Plankton and Analysis Stomach Content and Trophic Level in Makassar...Agriculture Journal IJOEAR
The research aims to know the condition of environmental parameters both from biological factors and physical factors of the Makassar Strait during the East season. The usability of the research ie can be to build and simulate dynamic models of fisheries systems. Data Collection has been carried since May 2019 to November 2019. Data collection on environmental parameters (temperature, salinity, pH, dissolved oxygen, flow velocity) and nutrients (nitrates and phosphates), phytoplankton and zooplankton abundance, , and gastric contents analysis were carried out, Method for analysing was used analysis of variance (ANOVA) to compare environmental parameters, nutrients and abundance of plankton between the three districts observed. The relationship between the abundance of plankton with environmental parameters was analyzed by using multiple linear regression analysis. Determination of trophic level is based on analysis of gastric contents using the TrophLab 2K program. Results of analysis of variance (ANOVA) between observation stations grouped in 6 months of observation showed that salinity was significantly different between locations and months of observation, temperature and pH were significantly different between months but did not differ according to location of observation, whereas DO levels did not show differences either between locations. The results of identification of phytoplankton types obtained during this research were dominated by diatoms. The type of zooplankton obtained is generally dominated by copepods. The result of gastric surgery is 10 dominant and economically valuable fish's species belonging to planktivor, omnivor and carnivor fish, and based on ecosystems including pelagic and demersal fish.
Evaluation of the oyster farming potential of the Cintra bay (southern Morocco)Origins publication
The bay of Cintra is a marine ecosystem located in the southern Moroccan Atlantic known for its
biological richness and therefore for its high fishery productivity. This bay was chosen as a new destination for the
development of aquaculture in the southern regions of Morocco. To highlight its potential in terms of oyster
farming, a first rearing trial of triploid cupped oysters (Crassostrea gigas) as well as parallel monitoring of the
phytoplankton population and ecological parameters were undertaken. The results obtained showed that the oysters
adapt well to the conditions of the new environment where mortality was negligible, or even absent after a month
of launching. In terms of biological performance, the growth of individuals is continuous during the annual cycle
and after eight months the weight could reach 30.5 g which is a minimum weight for marketing. The AFNOR and
Lawrence and Scott indices showed a good physiological state and a better commercial quality of the oysters. The
filling rate of these oysters, with an average weight of 39.7g when lifting, is very high according to the Lawrence and
Scott index (126.3) and the average AFNOR index (around 21.8) rank them in the “Special” category.
This study is an attempt to understand the population characteristics such as Length-weight relationships, age, growth, mortality, length at age and exploitation rate of Frigate tuna, Auxis thazard occurring in the North west coast of India. The data collected from various fish landing centers from 2008 to 2012 were considered for this study. The mean fork length and weight 32.35 cm and 1.040 kg were observed respectively. The length-weight relationship W=2.4321x10-1 FL 2.27658, and r2 0.9576 was obtained. The value of ‘b’ found to be less than 3 and hence this species is showing negative allometric growth. The growth parameters on von Bertalanffy for L∞ estimated as 47.03, K was 1.30 and to was -0.23. The Phi-prime value (⏀) of 3.33 was derived. The length at age observed at the end of 1 to 4 years was 27.0, 42.0, 50.0 and 55.0 cm year-1 respectively. The natural mortality (M) 1.00 year-1, total mortality (Z) of 4.43 year-1 and fishing mortality (F) 3.43 year-1 were derived with the mean temperature of 27°C. The exploitation ratio(E) and exploitation rate(U) was 0.77. The results derived in the present study with regard to population characteristics of frigate tuna in the coastal waters of North west coast of India indicate catching of this species in the area to be minimized Key-words- Length-weight relationships, Mortality, Length at age, Exploitation ratio, Exploitation rate
Assessment on Accumulation of Heavy Metals and its Effect on Liver Tissues of...ijtsrd
Heavy metal pollution is a very serious issue in the present world and is caused by release of toxic substances from industrial and domestic sources into the sea water leading to harm marine organisms. Marine fishes are commonly consumed for its nutritional benefits and thus lead to transfer toxic metals into the food chain. Harpodon nehereus is a common and local fish from west coast of Maharashtra with high consumption rate among local population. Fish organs particularly liver being major site of detoxification shows structural alterations on exposure to pollution stress from their surrounding environment. Histopathological examination provides an indication of organ impairment to evaluate the health status of selected fish and the degree of pollution in marine environment. The present research effort was done to evaluate the concentration of heavy metals and to study histopathological alterations in liver tissues of largely consumed fish Harpodon nehereus collected from Sassoon dock, west Coast of Maharashtra, India. The research was carried out during the post-monsoon season of the year. High accumulation of lead 11.8 ± 8.34 mg kg , copper 20.46 ± 11.06 mg kg and Zinc 286.26 ± 114.5 mg kg were observed in liver tissues. Further histopathological study of present investigation reveals heavy damages in liver tissues of Harpodon nehereus representing that the selected fish is under high threat of pollution stress. Archana Oza | Leena Muralidharan "Assessment on Accumulation of Heavy Metals and its Effect on Liver Tissues of Harpodon Nehereus from Mumbai Coast of Maharashtra, India" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-2 , February 2019, URL: https://www.ijtsrd.com/papers/ijtsrd20250.pdf
Paper URL: https://www.ijtsrd.com/biological-science/zoology/20250/assessment-on-accumulation-of-heavy-metals-and-its-effect-on-liver-tissues-of-harpodon-nehereus-from-mumbai-coast-of-maharashtra-india/archana-oza
Application of analytical techniques to preserve the biodiversity and ecologi...CIFOR-ICRAF
Presented by Dr. Tran Thi Nhu Trang, Faculty of Environmental and Food Engineering, NTTU, on 10 November 2020 at "International workshop: Enhancing wetland management and sustainable development"
Prezentare la THE FIFTH ANNUAL ZOOLOGICAL CONGRESS OF "GRIGORE ANTIPA" MUSEUM 20-23 November 2013 "Ion Heliade Rădulescu" Amphitheatre of the Romanian Academy, Bucharest, Romania
Similar to Effect of some abiotic factors on the growth of Oreochromis niloticus Linnaeus, 1758 (Perciformes: Cichlidae) in tropical ecosystems (Cameroon)
Environmental conditions and zooplankton community structure in five ponds in...Innspub Net
The degradation of surface water quality in Cameroon is linked to the absence of a functional waste management strategy. For such a strategy to be efficient, a general understanding of aquatic ecosystems will be of importance, these management strategies are particularly lacking in the eastern part of the country. To better understand and appreciate the ecosystems in the town of Bertoua, five ponds where chosen for the physicochemical and zooplankton communities analysis. Sampling on these ponds was conducted from March 2016 to April 2017 on a monthly basis. Samples for physicochemical analysis were collected at 20cm below water surface at the middle of each pond and measured were done following the recommendations of Rodier and Alpha. Biological samples were collected by filtering 50 liters of water through a 64µm mesh opening sieve. Identification was done using standard methods and identification keys. One-way ANOVA analysis was conducted to assess the potential differences between the different ponds base monthly observations. Although they are all hypereutrophic, with regard to the values of the physicochemical parameters, the five ponds showed no significant difference between them but, the structure of the zooplankton community remains very diverse. 118 zooplankton species have been identified in the five ponds. The distribution of zooplankton in these hydrosystems was mainly governed by the presence of organic matter. This study sheds light on the status and biological diversity of ponds in eastern Cameroon, data on which to rely to develop management strategies.
Distribution of zooplankton community in Toli shad (Tenualosa toli) habitats,...AbdullaAlAsif1
Distribution of zooplankton community in Toli shad (Tenualosa toli) habitats, Sarawak, Malaysia. Biodiversitas 21: 4022-4033. The river ecosystems of Sarawak has been identified as important-spawning ground for economically important Toli shad (Tenualosa toli) fisheries. In these river ecosystems, zooplankton serves as a secondary producer to the different types of fish larvae including Toli shad. The productivity and biomass of zooplankton are important factors to control the production of higher trophic level organisms like fish larvae and fishes in different stages including T. toli larvae. In this viewpoint, the composition and abundance of zooplankton were investigated at 5 (five) sampling stations (considered to be spawning and nursing areas of Toli shad) at Batang Lupar and Batang Sadong estuaries from July 2016 to June 2017. A total of 29 zooplankton taxa were recorded that belong to 14 major groups comprised of Copepoda (Arthropoda), Crustacean nauplii (Arthropoda), Fish larvae (Chordata), Mollusca (Mollusca), Luciferidae (Arthropoda), Cnidaria (Cnidaria), Ostracoda (Arthropoda), Cirripedia (Arthropoda), Polychaete larvae (Annelida), Chaetognatha (Chaetognatha), Appendicularia (Chordata), Amphipoda (Arthropoda), Echinodermata larvae (Echinodermata) and Cladoceran (Arthropoda). Copepod was dominant group of zooplankton (82.40-94.41%) at all stations, contributing 477.37-25921.89 ind/m3 and 88.38% of total abundance. The second highest was crustacean larvae (2.45-9.38%) in all stations, contributing 0-2391.7 ind/m3 and 5.88% of total abundance. Zooplankton abundance was higher at downstream station 1 (8460.72 ind/m³) followed by station 2 (5479.80 indi/m³), station 3 (4571.95 ind/m³), station 4 (4394.20 ind/m³) and upstream station 5 (4156.73 ind/m³). Canonical Correspondence Analysis showed that the abundance of copepods was highly influenced by total turbidity and nitrate in the riverine and estuarine ecosystems. Abundance of zooplankton was relatively higher (9549.31 ind/m³) during the post-monsoon and lower (3534.56 ind/m³) during the southwest monsoon.
Abundance Plankton and Analysis Stomach Content and Trophic Level in Makassar...Agriculture Journal IJOEAR
The research aims to know the condition of environmental parameters both from biological factors and physical factors of the Makassar Strait during the East season. The usability of the research ie can be to build and simulate dynamic models of fisheries systems. Data Collection has been carried since May 2019 to November 2019. Data collection on environmental parameters (temperature, salinity, pH, dissolved oxygen, flow velocity) and nutrients (nitrates and phosphates), phytoplankton and zooplankton abundance, , and gastric contents analysis were carried out, Method for analysing was used analysis of variance (ANOVA) to compare environmental parameters, nutrients and abundance of plankton between the three districts observed. The relationship between the abundance of plankton with environmental parameters was analyzed by using multiple linear regression analysis. Determination of trophic level is based on analysis of gastric contents using the TrophLab 2K program. Results of analysis of variance (ANOVA) between observation stations grouped in 6 months of observation showed that salinity was significantly different between locations and months of observation, temperature and pH were significantly different between months but did not differ according to location of observation, whereas DO levels did not show differences either between locations. The results of identification of phytoplankton types obtained during this research were dominated by diatoms. The type of zooplankton obtained is generally dominated by copepods. The result of gastric surgery is 10 dominant and economically valuable fish's species belonging to planktivor, omnivor and carnivor fish, and based on ecosystems including pelagic and demersal fish.
Assessment of pesticides residues in fish (Tilapia guineensis) in the Couffo ...IJEAB
In Benin, the main cash crop is the cotton of which the level of production is largely insufficient to satisfy the national and international market. The main food crops (corn, cassava, yam, bean, rice, etc.) permit to cover the food needed globally, but remain again extensively on this side of the potentialities offered by the ecological conditions of the country. In the process to increase the agricultural production, the herbicides, insecticides and the fertilizers are used now in higher quantity that in the past. The aim of this work was to assess the level of contamination of fish (Tilapia guineensis) in the Couffo River in Djidja (Benin) by the pesticides. Nine (09) samples of fish (Tilapia guineensis) have been collected in nine (09) points along the Couffo River. The analysis of these fish has been done by gas chromatography after extraction and purification. In fish, the detected concentrations in average ranged between 0.123 µg/kg and 0.191 µg/kg for the glyphosate, from 0.095 to 0.128 µg/kg for the profenofos, between 0.112 and 0.125 µg/kg for the acetamiprid and 0.127 and 0.139 µg/kg. To assess the risk to public health, pesticides intake by fish consumption was estimated and compared with Estimated Daily Intake (EDI) values reported by the Codex Alimentarius. This comparison showed that fish consumption does not pose a risk for public health.
Effect of water parameters on temporal distribution and abundance of zooplank...AbdullaAlAsif1
Seasonal abundance of zooplankton in relation to different physico-chemical conditions of Kaptai lake has been studied. A total of four major groups of zooplankton were identified from study area of Kaptai lake during three seasons observation at pre-monsoon, monsoon and Post-monsoon. These four groups were categorized into rotifers, copepods, cladocerans and others (fish larvae, shrimp larvae, insects, mosquito larvae etc.). The mean abundance of group rotifers, copepods, cladoceras and others were 103, 84.67, 38.33 and 41.83 ind. L-1 respectively. The highest group was rotifers in terms of abundance and composition where compositions were recorded 38 % at three season's observation. The lowest group was cladoceras in term of abundance and composition where compositions were recorded 14 %. The air temperature, water temperature, transparency, water pH, DO, BOD5, PO 4-P, NO 2-N, SiO 3-Si, TSS, TDS, Alkalinity ranged between 21 and 27.5C, 23.5 and 31.5C, 0.8 and 3 m, 7.1 and 7.5, 5.72 and 8.58 mg/l, 8.55 and 12.87 mg/l, 3.22 and 4.13 µg/l, 0.992 and 1.19 µg/l, 161.18 and 201.15 µg/l, 0.28 and 0.48 g/l, 0.18 and 0.68 g/l, 40 and 60 ppm, respectively. Margalef richness index (d), Pielou's evenness index (J'), Shannon-Wiener diversity index (H'), Simpson dominance index (λ) are analyzed by Primer V6 software to quantify the collected species. Through same software SIMPER, Cluster analysis also done to compare similarity between season.
Standard water quality requirements and management strategies for fish farmin...eSAT Journals
A study on standard water quality requirements and management strategies suitable for fish farming is presented. The water quality criteria studied based on physical, chemical and biological properties of water include temperature, turbidity, total suspended solids (TSS), total dissolved solid (TDS), nitrate- nitrogen, pH, biochemical oxygen demand (BOD) and total hardness. Water samples from Otamiri River in Imo state, Nigeria, were analyzed based on the afore-mentioned criteria to assess its suitability as a source of water for fish farming. The results of the analysis compared with international standards revealed that the river temperature of 26.90C, nitrate-nitrogen value of 0.015 mg/l and total suspended solids of 18.60 mg/l fall within the acceptable range for fish farming. However, the pH of 5.82, total hardness of 5.8 mg/l, total dissolved solids of 13.60 mg/l and biochemical oxygen demand of 0.6 mg/l all differed slightly from the standard recommended values. This study will aid fish farmers on the necessary treatment needed to effectively use water from this source for fish farming.
Keywords: Water quality criteria, Otamiri River, biochemical oxygen demand, total suspended and total dissolved solids.
Physico-chemical parameters and macrobenthic invertebrates of the intertidal ...Angelo Mark Walag
Physico-chemical parameters and macrobenthic invertebrates of the intertidal zone of Gusa, Cagayan de Oro City, Philippines were assessed from March to May 2014. Water temperature, pH, salinity, dissolved oxygen, biological oxygen demand, and type of substrate were determined in the study were within the normal range. A modified transect-quadrat method was used in an approximately 14,000 m2 of study area. Seven hundred twenty seven individuals belonging to 15 species were found in the area. These organisms belong to four phyla namely: Mollusca, Arthropoda, Echinodermata, and Annelida. The three most abundant organisms found were Coenobita clypeatus, Ophiothrix longipeda, and Cypraea poraria with relative abundance of 73.86%, 4.13% and 3.71% respectively. Most of the macrobenthic fauna identified exhibited a clumped pattern of distribution, while the rest are randomly distributed. The species diversity of the area is 1.19 which is very low compared to reports from related studies.
Physico Chemical and Bacteriological Quality of Water Sources in the Coast of...ijtsrd
The study of water sources used by the population of Ndian for drinking with the exception of the Ekondo Titi beach was carried out by investigating 51 water sources. Due to the lack of pipe borne water in this area, the population is compelled to consume water from unprotected shallow aquifers and surface water sources, there by exposing the population to infections form of water borne diseases. In this perspective, the present study was aimed to check the suitability of these water sources for drinking. The bacteriological quality of the water sources was performed using the Most Probable Number MPN technique. Temperature, pH, electrical conductivity EC and total dissolved solids TDS were also determined. The pH values reflect slightly acidic, neutral and basic water sources. Sixty percent 60 of the ground water samples where slightly acidic 5.5 6.4 and out of the WHO 2011 guideline limit 6.5 8.5 for drinking water. This situation puts the inhabitants at risk to stomach ulcer. The electrical conductivity values 3.00 274 us cm for groundwater sources represents water experiencing slight mineralization. Based on the total coliform bacteria, 96 of water sources were polluted to grossly polluted 75 2400 MPN 100 ml and 4 excellent following the acceptable maximum limits prescribed by the World Health Organization Standards which exposes the population to water borne diseases such as typhoid, cholera and dysentery. The bacteria contamination of the water sources may result from the waste of pit toilets that intersect the water tables of shallow unconfined aquifers and also from poor sanitation practices carried out along stream channels and springs. Proper water treatment at household levels is highly recommended. Engome R. Wotany | Samuel N. Ayonghe | Mengnjo J. Wirmvem | Wilson Y. Fantong "Physico-Chemical and Bacteriological Quality of Water Sources in the Coast of Ndian, South West Region, Cameroon: Health Implications" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-5 , August 2019, URL: https://www.ijtsrd.com/papers/ijtsrd26626.pdfPaper URL: https://www.ijtsrd.com/other-scientific-research-area/geology/26626/physico-chemical-and-bacteriological-quality-of-water-sources-in-the-coast-of-ndian-south-west-region-cameroon-health-implications/engome-r-wotany
Changes in benthic communities in the Middle Atlas springs (Morocco) and thei...Innspub Net
The sources of the Moroccan Middle Atlas suffer not only the effects of anthropogenic pressures, but also those of climate change whose impact is difficult to predict. Our goal is to better understand the succession of processions fauna of the upper Guigou. It is a compendium comparative between the benthic fauna collected towards the end of the years 70 (1979) in the sources Arbalou Abrchane, Tit Zil and the Wadi Guigou. As well as those harvested in the same sites, thirty-four years after. This revealed a significant drop in dissolved oxygen concentration decreased from 7.4 (mg/l) in 1979 to 2.52 (mg/l) in 2015. We have also raised an increase in the workload in chlorides and major elements. Benthic fauna, a significant change in population since 1979, with the appearance and installation of more than a dozen of taxa were identified (Simulium pseudoquinum, Gammarus gauthieri, Phagocata sp., Dugesia gonocephala). Some of these species have become invasive, such as Amphipod crustaceans Gammarus gauthieri, either very abundant as Simulium pseudoquinum. We note the effect “medium” for the direct selection of the species. Other indirect effects due to the reduction of the three dimensional biogenic structures would have limited recognizably State niches by polluo-sensitive species (Ephemeroptera, Heteroptera, Coleoptera and Trichoptera) and could contribute to the total disappearance of all order plecoptera in favour of a dominance of the polluo-tolerant species (Oligochaetes). Over a period of 35 years, there is a deterioration of the health of the aquatic ecosystem studied, a State of art reflected by a decline of the benthic community that lives there.
Diversity of fish and macrobenthos at the coastal area of Tanjung Kidurong Po...AbdullaAlAsif1
The regular assessment of faunal diversity near the energy power plant has gained the interest of many researchers. The activity and the effluent discharged from the power plant have remarkably stressed the adjacent assemblage of the alpha biotic community surrounding the power plant. Hence, this study aimed to assess the alpha faunal diversity of fishes and benthos in the bordering areas of Tanjung Kidurong Combined Cycle Power Plant (TKCCP), Bintulu Sarawak. The investigation was conducted in the coastal area from 2019 to 2020. Different ecological indices such as the evenness index, Margalef richness, and Shannon-Weiner diversity index were implemented, along with the cluster analysis of other stations. A number of 141 fish individuals were recorded, containing 40 species of 19 families. In addition, 13182 individuals of benthos communities from six classes and 37 species were identified. A percentage of 78 comprised fishes, while 22% were identified as crustaceans. Among the benthos addressed, Foraminifera was the major group (74%), followed by bivalve (10%) and Scaphopoda (7%). Compared to SEB2, 3 & 4, SEB1, the nearest to the power plant, recorded the highest richness, number of species, and diversity indexes. Cluster analysis, PCA, and nMDS analysis suggested that SEB2, SEB3, SEB4 had similar biodiversity compositions. The study of benthos indicates that SEB1 possesses a distinguished value of diversity and evenness indexes. This study would provide future researchers with vital documentation to evaluate the impact of thermal discharge from the power plant on alpha biodiversity in Bintulu, Sarawak, Malaysia.
Assessment of size structures, length-weight models and condition factors of ...AI Publications
The Eleotridae is one of the fish family widely distributed in the Benin coastal waters where the species constitute an important component of artisanal fisheries. The current study evaluates length frequency distributions, length-weight models and condition factors of Eleotrid fishes in order to assess their wellbeing in the degrading coastal waters of Benin. Fish samplings were made during eighteen (18) consecutive months and morphometric data were recorded and analyzed using SPSS computer software. Larger Eleotrids were Eleotris vittata, E. senegalensis, E. daganensis and Bostrychus africanus while Dormitator lebretonis, the most abundant species displayed small sizes (standard length) ranging between 1.2 - 11.30 cm. Overall, all the species showed unimodal size distributions except Eleotris daganensis that exhibited a bimodal size distribution in Lake Nokoué. Length-weight models showed allometric growth with slopes b ranging between 2.4725 and 3.7296 along with significant correlation coefficients (r) varying between 0.7695 and 0.9965. Condition factors (K) varied significantly across the four (4) coastal waters and ranged between 0.79 (Dormitator lebretonis) and 3.60 (Eleotris daganensis). The sustainable exploitation of Eleotrid fishes in the Benin coastal waters requires a holistic approach of ecosystem management including ecological follow-up, habitat restauration and species valorization.
Proximate and mineral composition of the long-spined Sea Urchin (Diadema seto...AbdullaAlAsif1
Gonad of sea urchin is considered as food delicacy in many parts of the world due to high nutrition and mineral contents. Several species of sea urchins are available in Malaysia and reported from different habitat, including seagrass beds, coastal breakwater, coral reefs and other ecologically important habitats. The current study was undertaken to evaluate the proximate and mineral composition of long spined sea urchin (Diadema setosum) roe collected from breakwater of Terengganu, Malaysia in October 2019, November 2019 and January 2020. The samples were analysed for proximate including protein, lipid, moisture, and ash content of sea urchin roe. The macro, micro minerals and heavy metals were also evaluated including Ca, Fe, Zn, Cu, Co, Se, Mg, Ni, Pb, Al, and Cd. The result suggested that, long spined sea urchin (Diadema setosum) roe can be considered as good sources of food due to high percentage of protein (ranged between 36.21±0.44 and 50.14±4.63). The presence of heavy metal such as Ni, Pb, and Cd suggesting the breakwater environments were not good enough and the possible sources of heavy metals contamination in sea water environment must be stopped and eradicated. This study provides important information with regard to the proximate and mineral values of D. setosum, as well as the need for a better management of its habitat before D. setosum can be widely promoted as delicacy in this region.
Diversity and abundance of Macrobenthos in a subtropical estuary, BangladeshAbdullaAlAsif1
Soft bottom macrobenthos are important component of the marine and coastal trophic chain. There has been sparse information regarding the distribution of soft bottom macrobenthos form the coastal water of Bangladesh. Consequently, the present study was an effort to reveal the diversity and abundance of macrobenthos in the Feni Estuary in a seasonal pattern together with the hydrological factors. A total of 17 taxa families of soft-bottom invertebrates were found over the two sampling seasons. The current study yielded a total number of 34,726 ind./m 2 (mean 2480ind./m 2) including 18,909ind./m 2 in wet season (mean 2682ind./m 2) and 15,817 ind./m 2 in dry season (2259ind./m 2). The highest density of soft-bottom invertebrates was in the wet season while the lowest number in the dry season. A total of 5 groups of macrobenthos were found over the two sampling seasons. The dominant group was Polychaeta that contributed 43.60% of the total soft-bottom invertebrates. The values of biodiversity indices were higher in dry season compare to the wet season in most of the sampling station during the study period.
The role of abiotic factors in diurnal vertical distribution ofAlexander Decker
The International Institute for Science, Technology and Education (IISTE). Science, Technology and Medicine Journals Call for Academic Manuscripts
Similar to Effect of some abiotic factors on the growth of Oreochromis niloticus Linnaeus, 1758 (Perciformes: Cichlidae) in tropical ecosystems (Cameroon) (20)
Considering the effects of chemical herbicide application, biomarkers have
now become more widely considered for controlling weeds. Allelopathy demonstrates
the potential for this through the release of trace elements from decomposable plant
leaves, seeds, stems and strains. In order to investigate the effects of aqueous extract
of sunflower on the germination and morphological characteristics of Rumex acetosa,
Lepidium draba and Convolvulus arvensis seedlings as three common weeds in sugar
beet fields, a research experiment was carried out in the laboratory of Islamic Azad
University, Neishabour, in 2016 as a factorial in the form of completely randomized
design with four replications. The experimental treatments were aqueous extract of
sunflower (zero, 25%, 50%, 75% and 100%), the type of weed in three levels (Rumex
acetosa, Lepidium draba and Convolvulus arvensis), respectively. The results showed
that the highest percentage and rate of germination were observed in non-use of
sunflower extract (irrigation with distilled water), which in Rumex acetosa 97 and 33
percent were higher respectively, in comparison to Lepidium draba and Convolvulus
arvensis. In the study of stem fresh weight, fresh and dry weight of roots, it showed
that the field bindweed plant was more resistant compared to Rumex acetosa,
Lepidium draba. The lowest germination and seedling traits were obtained in 100% of
sunflower aqueous extract, which affected the weeds of the Ivy and Blacks, and the
sorrel was more resistant. According to the results, sunflower extract as a strong
combination for weed control can have promising results for sustainable agriculture.
In order to have data on the consumption of okra in Ivory Coast, a survey was
carried out in a school in the town of Adjamé among young people aged between 15
and 35 years. The survey showed that all respondents knew okra 57.80% of
respondents appreciate okra fresh, 39.20% dry and 03% do not appreciate at all the
okra. It also showed that 18.60% of respondents appreciate the sauce gombo, 20.80%
gouagouassou the sauce, the 13.80% Kopé sauce, 39.20% djoumblé the sauce, sauces
made 0.8% made from sheets of okra. 06.80% do not like these sauces. All people
surveyed know the varieties of "Gombo baoule" and "Gombo dioula." In conclusion,
the existing prejudices about fresh okra are the dried okra is more popular among
young people in Côte d'Ivoire.
Five diets (diets incorporated with folic acid, vitamin B, vitamin C, vitamin/
mineral mix and control) were used to determine their effects on survival, digestive
enzyme activity, protein profiling and growth of striped snakehead Channa striatus
fingerlings. All vitamin diets showed significant difference in enzyme activity like
protease, amylase and lipase, when compared to that of control. The fingerlings fed
with vitamin C diet showed significantly (P<0.05) better performance in terms of
survival rate, weight gain and Specific Growth Rate (SGR) when compared to the rest
of the four diets. The electrophoretic studies revealed that high molecular weight
fractions were added up in muscle tissue of C. striatus fed with vitamin and mineral
supplemented diets.
Mining is considered as a difficult and harmful job as it is done in a very
difficult physical and environmental condition. In addition to that, miners are exposed
to the dangers, damages and even death because of the bad condition of mines. The
dangers of mines are different in accordance with the kind of mine which may be
underground or surfaces. The dangers may be a bit different in different cities and
mines. Main harmful factors in mining are the physical damages, hyperthermia,
hearing loss, lung diseases, musculoskeletal diseases and facing with dangerous gases
and beams. The purpose of this essay is to examine the effect of physical, chemical
and biological harmful factor on miners. This survey has adopted descriptive method
and data are collected by library method. The results showed that the exposure of
chemical factors such as dust, methane and silica, and physical factors such as noise,
radiation, and biological factors may have great danger for miners.
The intensive study was conuducted for the prevalence and distribution of
Armigeres obturbans for the first time in the rural area surrounding Rajkot City. Seven
villages were identified for the study species identification, larval density, adult
density and distribution of breeding sites of the species. Results showed that adult
density of Ar. obturbans during monsoon was highest and post monsoon period was
most favourable for the species. Also the breeding sites of the species were recorded
more during this period. While during winter season majority of temporary breeding
sites dries out because of temperature decrease. Therefore, the temperature and
rainfall are the two variables that showed major effect on the breeding activities of
this species.
In order to assess the Myxosporeans fauna of Cameroon fresh water fishes so
as to find the fight strategies, 655 specimens (350 Oreochromis niloticus and 305
Barbus callipterus) were sampled in Mapé river (Sanaga basin) and examined.
Standard methods were used for the sampling of fishes, conservation and microscopy.
Morphometric characteristics of the spores were used for species identification. Two
new species belonging to the genus Myxobolus Büstchli, 1882 were described namely
Myxobolus tchoumbouei n. sp in Barbus callipterus which formed cysts within various
organs (fins, skin and operculum); Myxobolus mapei n. sp parasite of kidneys and liver
in Oreochromis niloticus and Barbus callipterus. Myxobolus tchoumbouei exhibited
very long spores (19.19 x 8.89 μm), pear-shaped with rounded anterior end
sometimes flattened. Polar capsules were dissymmetrical. They measured 7.60 x 3.00
μm for the bigger and 7.06 x 2.62 μm for the smaller. Myxobolus mapei n. sp had
ellipsoidal spores (13.50 x 6.83 μm) with unequal polar capsules. The larger polar
capsule (6.44 X 2.88 μm) was about 1.5 times longer than the smaller one (4.13 X 1.61
μm) and filled half of the spiral cavity. The awareness about these parasites is useful
to find fighting strategies.
Hyaluronic acid (HA) is also known by the name hyaluronan. The necessity for
using this fabulous material lead to investigate non-pathogenic strains which produce
this material. The most non-pathogenic strain is S. thermophilus. The lack of literature
on microbial production of this substance by the strain prompted us to examine the
microbial production of HA from it and also to examine optimization of culture
conditions where HA is produced. The bacteria Streptococcus salivarius sub.
thermophilus was obtained from the Bank of Scientific and Industrial Research of Iran
(PTCC 1738). To separate S. thermophilus strains from yogurts, three types of yogurts
were used. They were cultured by pour-plate and surface methods on STA medium. To
identify the isolated strains, biochemical tests and Polymerase Chain Reaction (PCR)
were used. Bacterial strains isolated from yoghurts were identified as S. thermophilus
MN-BM-A02, S. thermophilus JIM8232 and S. thermophilus MN-ZLW-002. To separate
the capsule strains, each strain was cultured on STB medium and then they were
centrifuged. In order to purify the samples, ethanol and charcoal were used. To
optimize production, variety of sources of carbon, nitrogen, temperature and pH were
studied.
The qualitative and quantitative dynamics of the copepod community in
Hendijan harbor was studied through zooplankton samples collected seasonally in
summer 2010 (July- August), autumn 2010 (October), winter 2011 (December-
February) and spring 2011(April). The copepods community was represented by 27
species, belonging to calanoida (16 species), cyclopoida (5 species), Poecilostomatoida
(3 species) and harpacticoida (3 species). The highest abundance of copepods was in
summer (14402±3352 Ind/m3) while the lowest was in winter (852±155 ind/m3). Of
the adult forms, Acartiella faoensis was the most abundant species, forming 19% of
the total copepods, followed by Paracalanus parvus (17%), Corycaeus andrewsi (13%)
and Clausocalanus arcuicornis (8%). Most of copepod species displayed distinct
seasonal occurrence relative to environmental conditions. The spearman’s correlation
revealed that temperature and salinity were the most important factor controlling the
size of copepods density in Hendijan harbor. The cluster analysis demonstrated
different types of association between copepods species. The highest value of
Shannon’s diversity index, Margalef index and Pielou’s evenness was noticed in
summer. These results revealed that the summer is different from other seasons of
the year and in this season the ecological situation is better and more stable than
other seasons in Hendijan shores waters.
The main purpose of this research was to investigate the women pregnancy healthy status and behaviors in Eastern-Azerbaijan province referred to the treatment health centers in 2012. The present study was a cross-section study. So 30
married women between 15-49 years old have been taken up randomly for family adjustment and mother health and pregnancy care. A questionnaire including the demographic features and other questions about the status and behavior of the
pregnancy health affairs were used to collect the results. The obtained data of these questionnaires were analyzed by SPSS software. The results that showed 63.8% had itching or the vaginal stimuli and 34.9% (52 ones) had bad-smelling secretions and
36.9% (55 ones) had intense pain around the abdominal area. The investigation of these infectious diseases through sexual path showed that about 0.5% (3 ones) are challenging with these mentioned disorders. The results of the barrenness showed that about 8.7% (52 ones) tried to get pregnant but they did not get pregnant.
To evaluate the effect of humic acid fertilizer on potato tubers in 2010, trials were conducted in the Province of Iran. The experiment was conducted on a split plot with randomized complete block design having three replications. Main plots consisted of four levels of humic acid (0, 1, 2, 3 times) solution in water irrigation and sub-factor consisted of three varieties of potato (Marfona, Satina, and Born). During planting the application of humic acid at the rate of nine liters per hectare per load at the beginning and start of creating tuber formation respectively were done. Analysis of variance showed that the smallest and largest tuber weight, number of tubers per plant and yield per plant were not significant. Effect of humic acid on the smallest mean tumor weight at 1% and the number of tubers and yield per plant showed significant difference at 5% level. The largest tuber weight was also not significantly different. Interaction of humic acid fertilizer in any of the measured parameters showed no significant difference in potatoes. Comparison by Duncan test showed that the application of humic acid in all the three stages of growth had shown great impact on tuber weight. The highest number of tubers per plant has been associated with the use of humic acid (27 l/ha). The number of tubers per hectare with the application of 18 litres of humic acid showed no significant difference. The amount of humic acid applied were 18 and 27 litres per hectare, and increased performance is in the range of 13 and 29% respectively.
The purpose of this research was to investigate the students' attitude and consciousness degree regarding the pregnancy health in 2013 in Eastern-Azerbaijan Province. So, 300 students in different semesters have been taken up as accidentally from Tabriz, Marand, Bonab, Maragheh and Ahar have been taken up in this study. The WHO illustrative questionnaire for interview-questionnaire designed by John Cleland surveys with young people has been applied in this study. The statistical data has been completed by the help of SPSS software and descriptive and t-test statistical cases. The results showed the attitude score from the family adjustment is significantly higher than the determined degree positively. The results showed the sexual diseases are significantly higher than the fixed determined degree positively. Also it showed there is no observed any significant difference between the degree of the conscious and the students' attitude based on their marital status The results did not show any significant difference regarding the degree of the attitude among students.
The main purpose of the present study was to determine the effect of regular home visits on the developmental indices of low birth weight infants. The present study was an on-site clinical investigation. 90 infants ranging between 1500 to 2500g born in Razi Hospital of Marand town having the entrance criteria to the present study were taken into consideration through the available sampling method and then they were divided into two intervention and control groups. The intervention group has received the whole routine cares since the first to fourth week and then they were visited at home for 45 minutes a week. The control group received the routine cares. The evolutionary indices of both groups were also completed monthly for three months by referring homes. The related data gathering tool was also subjected to the demographic information through registration list and the Persian version of the Low Weight Infant Inventory (LWII) (2 months) that have been completed by the researcher on the birthday, first, second and third months of the birth through the interview. SPSS-15 software and the application of the inferential and descriptive statistical tests (K2 and T-tests) were also applied in order to analyze the related data in this study. The significance level was considered as p<0.05.
More than half of these related research units of both groups had experience (61.5%) and control (55.8%) regarding all women in this study; the mean score of the low weight infants on the first month had not shown any statistical significant difference; but on the second months (p=0.04) and the third months (p=0.001), they had shown statistical significant difference progressively. The healthcare based on home-visit had influence on the recovery indices of the low weight infants. Hence, nurses and other health monitors of the infants should apply for the healthcare programs based on home-visit particularly in caring infants.
Protein was extracted from muscles of Channa striatus and attempts were
made to evaluate in vitro antibacterial activity against clinical bacterial isolates. The
higher concentration of protein (100μg/ml) extracts exhibited a pronounced activity
against Pseudomonas aeruginosa (21 mm), Proteus vulgaris (19 mm), Citrobacter sp
(19 mm), Klebsiella pneumoniae (18 mm), Micrococcus sp (17 mm), Bacillus subtilis (16
mm), Staphylococcus aureus (15 mm), E. coli (14 mm) and Serratia marcescens (5
mm). The minimum inhibitory concentration and minimum bactericidal concentration
were found to be 20-40 μg/ml and 80-100 μg/ml respectively for the extracts of
Channa striatus protein against test organisms. This study confirms that C. striatus fish
protein extracts possess antibacterial activity against a wide range of microbes and
justified that it could be used in the traditional medicine as a remedy for the
treatment of bacterial diseases.
Food security in a growing population with limited natural resources is one of
the most important issues of the world. Accumulation of heavy metals in food and
their concentrations increase and reaching to a risk limit can threaten human health.
The purpose of this study, is to study the heavy metals lead and cadmium in
vegetables, cultured on spinach and watercress at 10 Gardens of Ardabil. This study is
cross-sectional and 81 samples in water, soil, and spinach and watercress were
prepared during the months of June, July and August in 2015 and after preparation
according to the standard methods and using atomic absorption spectrophotometer
(Perkin Elmer) for the determination of heavy metals. SPSS software was used for data
analysis. The results showed that the mean level of lead and cadmium in all samples
were less than the EPA standard. Between studied orchards in terms of the amount of
cadmium and lead no statistically significant different was seen. The independent ttest
showed that in terms of cadmium between two species of spinach and watercress
there found a significant difference at the 5% level so that the amount of cadmium in
spinach was more than the watercress. Since the concentration of heavy metals in all
samples at second and third stages in July and August were zero, but in the first step
in June, the amount of heavy metals have been found in some samples showed that
all three samples of first cut had more contamination than second and third cut. And
in this case, the concentration of heavy metal pollution in hibernation at vegetable
gardens Ardabil is possible. The results of spinach cadmium amount in the first cut in
the three garden of viz.,3, 6 and 10 showed that in the garden (3), the amount of
cadmium in water is higher than the standard and is concentrated in spinach and the
gardens of 6 and 10 Cadmium in the soil of the gardens, is slightly higher that is
condensed in spinach thus it can be considered that spinach in terms of cadmium has
bioaccumulation.
Generally, the reconstitution of palaeo-geography and related environments
is based on the study of sediment markers such as grain size and clay mineralogy. In
this research, 90 surface and subsurface sediment samples from eight cores were
analyzed for grain size and clay mineralogy in southern part of Urmia lake coast and
adjacent areas. Abundant minerals are quartz, feldspars, calcite and dolomite. Heavy
minerals identified were epidote, hornblende and zircon. Clay minerals are Kaolinite
and Smectite mainly. Clay mineralogy and mean grain size of sediments in eight cores
of Urmia Lake; reflect climatic conditions in this region. Relatively coarse sediments
usually deposited during Urmia Lake low stands and relatively fine sediments
deposited during high stands. The mineralogy of the clay-size fraction was determined
by X-ray diffraction (XRD). Mineral assemblages display two climate conditions: Those
having large Kaolinite, quartz, and feldspar peaks but a small smectite peak
(interpreted to be cold times), and those with small Kaolinite, quartz and feldspar
peaks and a large smectite peak-(warm sediments). In addition, smectite content
correlate well with high mean grain size in Urmia Lake sediments, whereas sediments
rich in Kaolinite, quartz, and feldspar correlate well with finer mean grain size.
Chemical elements of the total sample are mainly of terrigenous origin, supplied by
“Discharge Rivers”, which discharges in Urmia Lake. Variations in clay mineralogy and
grain size didn’t indicate that the lake-level variations and nature of sediments
delivered to the lake vary in concert with global climate changes, recently. Human
activities such as Dams’ constructions and agriculture have probably induced
variations in the mobilization of chemical elements.
According to the Convention on the Law of the Sea 1982, constructing
artificial island is permitted and countries can construct artificial islands in their own
territory. Constructing artificial islands in the Persian Gulf area makes the countries in
the region, especially Iran, to pursue the issue with more sensitivity. According to data
dissemination principle of International Environmental Law, the countries that
construct artificial islands should notify other states regarding construction and
properties of their own artificial islands. Today, artificial island construction is being
increased and this has caused many environmental crises including increase of water
darkness and pollution and transport of coastal sediments. In this study, the
destructive results of constructing artificial islands in the Persian Gulf environment,
the effect of development of new land space from geopolitical view, and also
constructing artificial islands from the viewpoint of International Law of the seas have
been reviewed. Moreover, according to the fact that the notion of governance in
modern International Law have been modified regarding the use of environment and
sustainable development, the states will have limited right to construct artificial
islands.
The use of biotechnology in the propagation of plantain and
banana (Musa sp.) of great importance to induce, tolerant to plant genotypes for
diseases and high yield potentials. However, auxins and cytokinins should be used,
which are expensive and can sometimes cause changes in the regenerants obtained.
Both traditional growth regulators (auxins and cytokinins) and non-traditional growth
regulators (brassinosteroid analogues and mixtures oligogalacturonide) are used in
the in vitro propagation of crops, but mush progress has been hindering due to the
sufficient knowledge and impact of different phases prevailing in the
micropropagation of banana hybrid 'FHIA-18' (AAAB) is present hitherto. This work
was performed in order to evaluate the biological activity of an analogue of
brassinosteroids (Biobras-6) *ABr+ and a mixture of oligogalacturonide with the degree
of polymerization between 9 and 16 (Pectimorf) *mOLG+. The effect of ABr and mOLG
are determined as a substitute or complement of auxin (IBA or IAA) and cytokinin (6-
BAP) for the establishment of in vitro multiplication and rooting of plantlets and in the
acclimatization phase. Non-traditional regulators phenolization decrease the explant
growth in the establishment phase of in vitro propagation; but increased the number
of shoots per explants (above 3.5) and improved survival of vitro plant during the
acclimatization phase.
Kumaun Himalaya, in the Indian Himalayan region, has a rich diversity of
medicinal plants, which are widely used in traditional medicinal systems. The present
paper concludes the diversity, vernacular names, associated authorship, ethnomedicinal
uses and use pattern, life form; plant part used and accession number of the
medicinal flora together. The paper describes distribution and local/traditional uses of
the 256 medicinal plants representing 96 families, in which pteridophytes were 1%,
trees were 18%, shrubs were 25%, herbs were 52%). Various plant parts used in
formulations, such as: underground part- 33%, leaves- 24%, whole plant- 11%, bark-
7%, seeds- 7%, resin /latex/oil- 4%, stem/ shoot/ wood- 4%, flowers and
inflorescences- 5%, fruits and nuts- 5% were used in different ailments.
There is a great contamination of water, soil, air, soil erosion, pest resistance
and extensive use of chemical fertilizers cause a turn to induce agriculture for
producing safe and clean products. For this purpose, by using natural materials like
algae on the beach, organic and environmentally friendly fertilizer was prepared. In
this investigation effect of Seaweed Liquid Fertilizer (SLF) of Ulva fasciata at
concentrations of 0%, 2.5%, 5%, 7.5% and 10% on some parameters of wheat
(Triticum aestivum var. chamran) has been investigated. Based on the results, above
algae can be used as a food supplement solution in the form of foliar spray at 2.5%
concentration with a significant increase in morphological and biochemical indices.
Cardiovascular diseases are considered as one of the threats to human
health, especially, in individuals with overweight. The aim of this study was to
investigate the effect of eight-week aerobic exercises in 10 to 12 years old overweight
girls. In this study, 27 overweight female student whit 10-12 years old were selected
and were randomly divided into two groups; a) training group (n=17) and b) control
group (n=10). Training group participated into the aerobic training for 8 weeks, with
70-85 percent of heart rate reserve maximum, 3 times a week and 60 minutes in each
session. The variables such as BF, BMI, WHR and VO2max, were measured in two
groups before and after the training period. The average of variables such as BF, BMI
and VO2max were significantly different between two groups (P<0.05). But the
average of WHR were not significantly different between two groups. According to
these results, aerobic exercise in 10-12 years old overweight girls, can have beneficial
effects on some cardiovascular risk factors.
Earliest Galaxies in the JADES Origins Field: Luminosity Function and Cosmic ...Sérgio Sacani
We characterize the earliest galaxy population in the JADES Origins Field (JOF), the deepest
imaging field observed with JWST. We make use of the ancillary Hubble optical images (5 filters
spanning 0.4−0.9µm) and novel JWST images with 14 filters spanning 0.8−5µm, including 7 mediumband filters, and reaching total exposure times of up to 46 hours per filter. We combine all our data
at > 2.3µm to construct an ultradeep image, reaching as deep as ≈ 31.4 AB mag in the stack and
30.3-31.0 AB mag (5σ, r = 0.1” circular aperture) in individual filters. We measure photometric
redshifts and use robust selection criteria to identify a sample of eight galaxy candidates at redshifts
z = 11.5 − 15. These objects show compact half-light radii of R1/2 ∼ 50 − 200pc, stellar masses of
M⋆ ∼ 107−108M⊙, and star-formation rates of SFR ∼ 0.1−1 M⊙ yr−1
. Our search finds no candidates
at 15 < z < 20, placing upper limits at these redshifts. We develop a forward modeling approach to
infer the properties of the evolving luminosity function without binning in redshift or luminosity that
marginalizes over the photometric redshift uncertainty of our candidate galaxies and incorporates the
impact of non-detections. We find a z = 12 luminosity function in good agreement with prior results,
and that the luminosity function normalization and UV luminosity density decline by a factor of ∼ 2.5
from z = 12 to z = 14. We discuss the possible implications of our results in the context of theoretical
models for evolution of the dark matter halo mass function.
Richard's entangled aventures in wonderlandRichard Gill
Since the loophole-free Bell experiments of 2020 and the Nobel prizes in physics of 2022, critics of Bell's work have retreated to the fortress of super-determinism. Now, super-determinism is a derogatory word - it just means "determinism". Palmer, Hance and Hossenfelder argue that quantum mechanics and determinism are not incompatible, using a sophisticated mathematical construction based on a subtle thinning of allowed states and measurements in quantum mechanics, such that what is left appears to make Bell's argument fail, without altering the empirical predictions of quantum mechanics. I think however that it is a smoke screen, and the slogan "lost in math" comes to my mind. I will discuss some other recent disproofs of Bell's theorem using the language of causality based on causal graphs. Causal thinking is also central to law and justice. I will mention surprising connections to my work on serial killer nurse cases, in particular the Dutch case of Lucia de Berk and the current UK case of Lucy Letby.
Cancer cell metabolism: special Reference to Lactate PathwayAADYARAJPANDEY1
Normal Cell Metabolism:
Cellular respiration describes the series of steps that cells use to break down sugar and other chemicals to get the energy we need to function.
Energy is stored in the bonds of glucose and when glucose is broken down, much of that energy is released.
Cell utilize energy in the form of ATP.
The first step of respiration is called glycolysis. In a series of steps, glycolysis breaks glucose into two smaller molecules - a chemical called pyruvate. A small amount of ATP is formed during this process.
Most healthy cells continue the breakdown in a second process, called the Kreb's cycle. The Kreb's cycle allows cells to “burn” the pyruvates made in glycolysis to get more ATP.
The last step in the breakdown of glucose is called oxidative phosphorylation (Ox-Phos).
It takes place in specialized cell structures called mitochondria. This process produces a large amount of ATP. Importantly, cells need oxygen to complete oxidative phosphorylation.
If a cell completes only glycolysis, only 2 molecules of ATP are made per glucose. However, if the cell completes the entire respiration process (glycolysis - Kreb's - oxidative phosphorylation), about 36 molecules of ATP are created, giving it much more energy to use.
IN CANCER CELL:
Unlike healthy cells that "burn" the entire molecule of sugar to capture a large amount of energy as ATP, cancer cells are wasteful.
Cancer cells only partially break down sugar molecules. They overuse the first step of respiration, glycolysis. They frequently do not complete the second step, oxidative phosphorylation.
This results in only 2 molecules of ATP per each glucose molecule instead of the 36 or so ATPs healthy cells gain. As a result, cancer cells need to use a lot more sugar molecules to get enough energy to survive.
Unlike healthy cells that "burn" the entire molecule of sugar to capture a large amount of energy as ATP, cancer cells are wasteful.
Cancer cells only partially break down sugar molecules. They overuse the first step of respiration, glycolysis. They frequently do not complete the second step, oxidative phosphorylation.
This results in only 2 molecules of ATP per each glucose molecule instead of the 36 or so ATPs healthy cells gain. As a result, cancer cells need to use a lot more sugar molecules to get enough energy to survive.
introduction to WARBERG PHENOMENA:
WARBURG EFFECT Usually, cancer cells are highly glycolytic (glucose addiction) and take up more glucose than do normal cells from outside.
Otto Heinrich Warburg (; 8 October 1883 – 1 August 1970) In 1931 was awarded the Nobel Prize in Physiology for his "discovery of the nature and mode of action of the respiratory enzyme.
WARNBURG EFFECT : cancer cells under aerobic (well-oxygenated) conditions to metabolize glucose to lactate (aerobic glycolysis) is known as the Warburg effect. Warburg made the observation that tumor slices consume glucose and secrete lactate at a higher rate than normal tissues.
Deep Behavioral Phenotyping in Systems Neuroscience for Functional Atlasing a...Ana Luísa Pinho
Functional Magnetic Resonance Imaging (fMRI) provides means to characterize brain activations in response to behavior. However, cognitive neuroscience has been limited to group-level effects referring to the performance of specific tasks. To obtain the functional profile of elementary cognitive mechanisms, the combination of brain responses to many tasks is required. Yet, to date, both structural atlases and parcellation-based activations do not fully account for cognitive function and still present several limitations. Further, they do not adapt overall to individual characteristics. In this talk, I will give an account of deep-behavioral phenotyping strategies, namely data-driven methods in large task-fMRI datasets, to optimize functional brain-data collection and improve inference of effects-of-interest related to mental processes. Key to this approach is the employment of fast multi-functional paradigms rich on features that can be well parametrized and, consequently, facilitate the creation of psycho-physiological constructs to be modelled with imaging data. Particular emphasis will be given to music stimuli when studying high-order cognitive mechanisms, due to their ecological nature and quality to enable complex behavior compounded by discrete entities. I will also discuss how deep-behavioral phenotyping and individualized models applied to neuroimaging data can better account for the subject-specific organization of domain-general cognitive systems in the human brain. Finally, the accumulation of functional brain signatures brings the possibility to clarify relationships among tasks and create a univocal link between brain systems and mental functions through: (1) the development of ontologies proposing an organization of cognitive processes; and (2) brain-network taxonomies describing functional specialization. To this end, tools to improve commensurability in cognitive science are necessary, such as public repositories, ontology-based platforms and automated meta-analysis tools. I will thus discuss some brain-atlasing resources currently under development, and their applicability in cognitive as well as clinical neuroscience.
(May 29th, 2024) Advancements in Intravital Microscopy- Insights for Preclini...Scintica Instrumentation
Intravital microscopy (IVM) is a powerful tool utilized to study cellular behavior over time and space in vivo. Much of our understanding of cell biology has been accomplished using various in vitro and ex vivo methods; however, these studies do not necessarily reflect the natural dynamics of biological processes. Unlike traditional cell culture or fixed tissue imaging, IVM allows for the ultra-fast high-resolution imaging of cellular processes over time and space and were studied in its natural environment. Real-time visualization of biological processes in the context of an intact organism helps maintain physiological relevance and provide insights into the progression of disease, response to treatments or developmental processes.
In this webinar we give an overview of advanced applications of the IVM system in preclinical research. IVIM technology is a provider of all-in-one intravital microscopy systems and solutions optimized for in vivo imaging of live animal models at sub-micron resolution. The system’s unique features and user-friendly software enables researchers to probe fast dynamic biological processes such as immune cell tracking, cell-cell interaction as well as vascularization and tumor metastasis with exceptional detail. This webinar will also give an overview of IVM being utilized in drug development, offering a view into the intricate interaction between drugs/nanoparticles and tissues in vivo and allows for the evaluation of therapeutic intervention in a variety of tissues and organs. This interdisciplinary collaboration continues to drive the advancements of novel therapeutic strategies.
THE IMPORTANCE OF MARTIAN ATMOSPHERE SAMPLE RETURN.Sérgio Sacani
The return of a sample of near-surface atmosphere from Mars would facilitate answers to several first-order science questions surrounding the formation and evolution of the planet. One of the important aspects of terrestrial planet formation in general is the role that primary atmospheres played in influencing the chemistry and structure of the planets and their antecedents. Studies of the martian atmosphere can be used to investigate the role of a primary atmosphere in its history. Atmosphere samples would also inform our understanding of the near-surface chemistry of the planet, and ultimately the prospects for life. High-precision isotopic analyses of constituent gases are needed to address these questions, requiring that the analyses are made on returned samples rather than in situ.
Comparing Evolved Extractive Text Summary Scores of Bidirectional Encoder Rep...University of Maribor
Slides from:
11th International Conference on Electrical, Electronics and Computer Engineering (IcETRAN), Niš, 3-6 June 2024
Track: Artificial Intelligence
https://www.etran.rs/2024/en/home-english/
Observation of Io’s Resurfacing via Plume Deposition Using Ground-based Adapt...Sérgio Sacani
Since volcanic activity was first discovered on Io from Voyager images in 1979, changes
on Io’s surface have been monitored from both spacecraft and ground-based telescopes.
Here, we present the highest spatial resolution images of Io ever obtained from a groundbased telescope. These images, acquired by the SHARK-VIS instrument on the Large
Binocular Telescope, show evidence of a major resurfacing event on Io’s trailing hemisphere. When compared to the most recent spacecraft images, the SHARK-VIS images
show that a plume deposit from a powerful eruption at Pillan Patera has covered part
of the long-lived Pele plume deposit. Although this type of resurfacing event may be common on Io, few have been detected due to the rarity of spacecraft visits and the previously low spatial resolution available from Earth-based telescopes. The SHARK-VIS instrument ushers in a new era of high resolution imaging of Io’s surface using adaptive
optics at visible wavelengths.
Slide 1: Title Slide
Extrachromosomal Inheritance
Slide 2: Introduction to Extrachromosomal Inheritance
Definition: Extrachromosomal inheritance refers to the transmission of genetic material that is not found within the nucleus.
Key Components: Involves genes located in mitochondria, chloroplasts, and plasmids.
Slide 3: Mitochondrial Inheritance
Mitochondria: Organelles responsible for energy production.
Mitochondrial DNA (mtDNA): Circular DNA molecule found in mitochondria.
Inheritance Pattern: Maternally inherited, meaning it is passed from mothers to all their offspring.
Diseases: Examples include Leber’s hereditary optic neuropathy (LHON) and mitochondrial myopathy.
Slide 4: Chloroplast Inheritance
Chloroplasts: Organelles responsible for photosynthesis in plants.
Chloroplast DNA (cpDNA): Circular DNA molecule found in chloroplasts.
Inheritance Pattern: Often maternally inherited in most plants, but can vary in some species.
Examples: Variegation in plants, where leaf color patterns are determined by chloroplast DNA.
Slide 5: Plasmid Inheritance
Plasmids: Small, circular DNA molecules found in bacteria and some eukaryotes.
Features: Can carry antibiotic resistance genes and can be transferred between cells through processes like conjugation.
Significance: Important in biotechnology for gene cloning and genetic engineering.
Slide 6: Mechanisms of Extrachromosomal Inheritance
Non-Mendelian Patterns: Do not follow Mendel’s laws of inheritance.
Cytoplasmic Segregation: During cell division, organelles like mitochondria and chloroplasts are randomly distributed to daughter cells.
Heteroplasmy: Presence of more than one type of organellar genome within a cell, leading to variation in expression.
Slide 7: Examples of Extrachromosomal Inheritance
Four O’clock Plant (Mirabilis jalapa): Shows variegated leaves due to different cpDNA in leaf cells.
Petite Mutants in Yeast: Result from mutations in mitochondrial DNA affecting respiration.
Slide 8: Importance of Extrachromosomal Inheritance
Evolution: Provides insight into the evolution of eukaryotic cells.
Medicine: Understanding mitochondrial inheritance helps in diagnosing and treating mitochondrial diseases.
Agriculture: Chloroplast inheritance can be used in plant breeding and genetic modification.
Slide 9: Recent Research and Advances
Gene Editing: Techniques like CRISPR-Cas9 are being used to edit mitochondrial and chloroplast DNA.
Therapies: Development of mitochondrial replacement therapy (MRT) for preventing mitochondrial diseases.
Slide 10: Conclusion
Summary: Extrachromosomal inheritance involves the transmission of genetic material outside the nucleus and plays a crucial role in genetics, medicine, and biotechnology.
Future Directions: Continued research and technological advancements hold promise for new treatments and applications.
Slide 11: Questions and Discussion
Invite Audience: Open the floor for any questions or further discussion on the topic.
This pdf is about the Schizophrenia.
For more details visit on YouTube; @SELF-EXPLANATORY;
https://www.youtube.com/channel/UCAiarMZDNhe1A3Rnpr_WkzA/videos
Thanks...!
Mammalian Pineal Body Structure and Also Functions
Effect of some abiotic factors on the growth of Oreochromis niloticus Linnaeus, 1758 (Perciformes: Cichlidae) in tropical ecosystems (Cameroon)
1. Article Citation:
Mohamed Nsangou Nchoutndignigni, Sévilor Kekeunou, Gidéon Ajeagah, Benoit
Bapfubusa and Abraham Fomena
Effect of some abiotic factors on the growth of Oreochromis niloticus Linnaeus,
1758 (Perciformes:Cichlidae) in tropical ecosystems (Cameroon).
Journal of Research in Biology (2015) 5(4): 1738-1754
JournalofResearchinBiology
Effect of some abiotic factors on the growth of Oreochromis niloticus
Linnaeus, 1758 (Perciformes: Cichlidae) in tropical ecosystems (Cameroon)
Keywords:
Oreochromis niloticus, fish farming, pond, water quality, fertilization.
ABSTRACT:
The Growth of Oreochromis niloticus (2.6g initial average size) was
studied in 100m2
earthen ponds for 180 days under tropical field environment.
Varying fertilizing regimes consisting of Pennisetum purpureum (PP) and Musa
sapientum (MS), two locally available weedy grasses were applied in duplicates in
the experimental ponds, at the rate of 0.1-0.2 kg dry matter per m2
per day.
Water quality parameters were monitored bimonthly between 8:00am-9:00am .
Final average fish weight varied significantly (p<0.05) as follows: 43.85g, 35.5g,
59.5g, 24.9g and 50g, 2 respectively for PP, MS, MS+PP, T0 and T1. Corresponding
daily growth were 2.2g/d, 0.1g/d, 0.3g/d, 0.1g/d and 0.2g/d. Survival rate equally
varied significantly as follow: 60 %, 67 %, and 98 %, 70 % and 97 % respectively.
During the study period, the results indicated the water quality were permissibole
limits and can be used for livestock of Oreochromis niloticus .
1738-1754 | JRB | 2015 | Vol 5 | No 4
This article is governed by the Creative Commons Attribution License (http://
creativecommons.org/licenses/by/4.0), which gives permission for unrestricted use, non-
commercial, distribution and reproduction in all medium, provided the original work is properly
cited.
www.jresearchbiology.com
Journal of Research in Biology
An International
Scientific Research Journal
Authors:
Mohamed Nsangou
Nchoutndignigni1,2*
,
Sévilor Kekeunou2
,
Gidéon Ajeagah3
,
Benoit Bapfubusa2
,
Abraham Fomena4
Institution:
1. Laboratory of Zoology, Higher
Teacher Training College,
University of Yaoundé I,
Cameroon
2. Laboratory of Zoology, Faculty
of Science, University of
Yaoundé I, Cameroon
3. Laboratory of Hydrobiology
and Environment, Faculty of
Science, University of Yaoundé I,
Cameroon
4. Laboratory of Parasitology and
Ecology, Faculty of Science,
University of Yaounde I,
Cameroon
Corresponding author:
Mohamed Nsangou
Nchoutndignigni
Email Id:
Web Address:
http://jresearchbiology.com/
documents/RA0504.pdf
Dates:
Received: 12 Jan 2015 Accepted: 10 Mar 2015 Published: 05 June 2015
Journal of Research in Biology
An International Scientific Research Journal
ORIGINAL RESEARCH
ISSN No: Print: 2231 –6280; Online: 2231- 6299
2. INTRODUCTION
Aquaculture contributes significantly to the
economies and food security (FAO, 2006). China has
seen its annual production of aquaculture increasing from
7% in 1961 to 35% in 2010. Nevertheless, it remains a
marginal activity in sub-Saharan Africa . Growth in sub-
Saharan Africa increased from less than 1% in 1989 to
4% in 2011 (FAO, 2012). Food security is a major
problem for African countries (Hishamunda and Jolly,
1998). To establish a balanced diet of the populations,
FAO (2006) thinks that the intensification and
diversification of fish production systems would cope
with this problem. Fish is the main source of protein for
a considerable part of the population. It represents 40%
of the protein intake of animal origin in the diet and
covers 9.5% of total needs. In 2012, these imports fishes
were estimated at 160,000 tons valued for a total of 60
billion Francs CFA (MinEPIA, 2014) .To solve the
problem of demand for fish, the Cameroonian state must
develop fish farming which is proposed as an alternative.
The healthy aquatic ecosystem depends on the
physico–chemical and biological characteristics
(Venkatesharaju et al., 2010). To assess these
characteristics, monitoring of these parameters is
essential to identify magnitude and source of any
pollution load. These characteristics can identify certain
condition for the ecology of living organisms and
suggest appropriate conservation and management
strategies (Srivastara et al., 2009, Damotharan et al.,
2010; Prasanna and Ranjan, 2010). It’s in this context
that we undertook the study of the aquatic ecosystem
ponds. This study adds new elements to previous works
done by Snoussi (1984); Foto (1989); Cheggour et al.,
(2004); Bazairi et al., (2005); Fekhaoui (2005); El
Morhit et al., (2008).
The aim of this work is to study the physical and
chemical parameters that influence the growth of
Oreochromis niloticus in earthen ponds. Better
monitoring of the water quality of fish ponds provides
better growth and therefore a good harvest of fish,
making fishes available in the Cameroonian market
MATERIALS AND METHODS
Study site feature
Yaounde which is, the political capital of
Cameroon (Central Africa). It’s lies between North
latitude 3°52' and longitude 11°32', with an average
altitude of about 750m above sea level (Sanchoir,
1995). The landscape is hilly and the city lies on several
hills which are 25 to 50m high (Eno-Belinga and
Kabeyene 1982; Ekodeck, 1984). The experimental
ponds for our research are located at the University of
Yaoundé I (Fig. 10).
The climate is equatorial, characterized by two
dry seasons (a long dry season from January to March
and a short dry season from July to August) alternating
with two rainy seasons (small rainy season from
September to mid-November and a long rainy season
from mid-March to June) of relatively uneven and
variable duration from one year to another (Suchel,
1987). Soils are ferro-lateritic with pH value ranging
from 4.5 to 5.8 (Yongué-Fouateu, 1986).
Experimental ponds are supplied by derivated
water from Olézoa, a stream meeting Mingoa and Aké
on the right bank of Mfoundi situated in the southern part
of Yaounde. Annual average water temperature is close
to 25 °C.
Biological materials
1000 fry of Oreochromis niloticus averaging
2.6g (±0,6) were used in the experiment. These fish were
reproduced at the Aquaculture Station Melen-Yaounde,
from brooders collected from Sanaga rivers some 10
years earlier (Brummett et al., 2004). The plant
materials consisted of Pennisetum purpureum and Musa
sapientum which was collected in the swamp of the
University of Yaounde I Campus.
Nchoutndignigni et al., 2015
1739 Journal of Research in Biology (2015) 5(4): 1737-1754
3. Ponds:
Five ponds of 100 m2
with a depth of 0.7m for
ponds 1, 2 and 3, and a depth of 1m for ponds 4 and 5.
To these five ponds, we added a reservoir of water of
about 200m2
with a depth of 1m (Figure 10). It was
installed between the months of April and May in the
year 2010 on an area of about 500 m2
located within the
campus of the University of Yaounde I.
Monotoring tools:
A roll of nylon wire, posts (bamboo) to identify
forties, a measuring tape (0001m near) and an
ichtyometer (nearly 0001m) to measure the sizes of fish
and a portable electronic balance HX-T (0.01g) for
weight measurements . The standard method for the
examination of water and waste water (APHA, 1985)
was followed for the analysis of all physical and
chemical water parameters such as pH, dissolved
oxygen, water temperature, turbidity, nitrate, and
phosphate. These were measured using a thermometer, a
pH meter (Schott Geräte CG818), an oxymeter (Schott
Geräte HQ30d), a SECCHI disc (30cm diameter) and a
spectrophotometer.
Experimental treatments
During the experimental season (between June
and November 2013), 5 ponds were used (Ponds 1, 2, 3,
4 and 5). Pond 1 received P. purpureum (20kg/100 m2
),
pond 2 received 20kg/100m2
M. sapientum, pond 3
received 10kg/100m2
MS+10 kg/100m2
PP. Ponds 4 and
Journal of Research in Biology (2015) 5(4): 1737-1754 1740
Nchoutndignigni et al., 2015
Table1: Physico-chemical characteristics of ponds recorded during the second cycle, from June to November 2013
Treatment PP MS PP+MS T0 T1
Pond Pond 1 Pond 2 Pond 3 Pond 4 Pond 5
pH 07.030±00.50 07.13±00.40 06.80±00.30 06.90±0.30 07.02±0.30
Water temperature (°C) 23.500±00.20 23.60±01.45 24.50±00.90 23.20±1.10 25.70±0.80
Dissolved oxygen (mg/l) 04.430±01.00 03.80±01.60 06.20±00.50 03.60±1.00 03.50±1.40
SS (mg/l) 23.300±09.20 17.50±05.05 0028±02.90 43.50±4.20 08.60±1.03
Turbidity (UTN) 48.800±15.10 0076±12.80 54.30±11.70 47.90±7.60 20.60±0.80
Nitrate (mg/l) 00.580±00.20 00.23±00.30 00.07±00.08 00.07±0.08 00.20±0.40
Phosphate (mg/l) 00.440±00.08 00.42±00.07 00.35±00.30 00.39±0.20 00.30±0.03
Note: SS: Suspended Solids; pH: potential of hydrogen. (Mean ± SEM); PP: Pennisetum purpureum,
MS : Musa sapientum, T1 : positive control, T0 : negative control.
Treatment PP MS PP+MS T0
T1
(Droppings)
Pond Pond 1 Pond 2 Pond 3 Pond 4 Pond 5
Law (g) 02,60±00.6 02,6±00.40 20.8±00.30 02.70±00.70 02.60±,04.00
Faw(g) 43.85±0028 35,5±22.40 59.5±39.20 24.93±16.80 50.23±33.70
Ias (cm) 05.20±00.2 04,6±00.50 40.8±00.40 05.10±00.30 04.60±00.50
Fas (cm) 17.00±03.2 14,5±02.80 22.5±05.40 13.00±02.20 22.00±05.40
Dg (g/j) 00.20±00.1 00,1±00.01 00.3±00.02 00.10±00.01 00.20±00.02
Survival (%) 60.00±01.1 67.0±01.20 98.0±02.60 70.00±01.60 97.00±02.30
Table 2: Zootechnical performance of different ponds Oreochromis niloticus fed three diets during 180
days of experimentation the second cycle. The results are expressed as: Mean ± SEM.
PP :Pennisetum purpureum, MS : Musa sapientum, T1 : positive control, T0 : negative control; Dg: Daily
growth; Faw: Final average weight; Fas: Final average size. Iaw: Initial average weight; Ias: Initial average
size The heterogeneity between the average weight is not significant at 5%.
4. 5 are control ponds. One (pond 4) is a negative control,
which received no treatment while the pond 5 is a
positive control that received 20kg/100m2
of chicken
manure. The salary adjustments were made every fifteen
(15) days after sampling. The algal ponds with a boom
(greenish color) this implies a nutrient rich environment
and can be effective empoisoning.
Sampling of water
In situ measurements
The physico-chemical parameters such as
temperature, transparency, pH, respectively were
measured in situ by means of a mercury thermometer, a
Secchi disk (diameter = 30cm), and a portable pH meter
(Shott CG818).
Laboratory measurements
In the laboratory, solids suspensions, color and
turbidity were evaluated by spectrophotometry (HACH
DR/2010) using techniques given in APHA (1985);
Dissolved oxygen was measured using a pulse oximeter
(Schott Geräte HQ30d). These parameters were
monitored regularly every two weeks from 8:am-9:am .
Fish sampling
Every 15 days around 8:am-9:am , fish samples
were made after partial emptying of ponds. The capture
of 30 individuals per pond is made randomly with
replacement. It was made using a fishing net (10m long
and 1m wide), a dip net with fine mesh for fry and / or
gillnet (14/10m) and a trap for adult stages. Catch weight
1741 Journal of Research in Biology (2015) 5(4): 1737-1754
Fig.1. Evolution of potential hydrogen from water ponds during different cycle
testing between June and November 2013
Nchoutndignigni et al., 2015
5. and size were taken at each sampling. At the beginning
of the experiment, the biomass of fishes in each area was
determined to the nearest gram. At the end of the trial, all
fishes from each farm structure was counted and
weighed together to the nearest gram.
Statistical analysis:
Final mean weight (g), survival (%), daily
growth (g/d) were computed. Data were subjected to an
analysis of variance and Duncan multiple-range test was
used to evaluate specifies differences between treatments
(significance level: 0.05).
RESULTS AND DISCUSSION
Monitoring of water quality in the framework of
this study is illustrated by taking some abiotic parameters
(Table 1). At the end of the cycle (180 days), the pH
ranged from 6.8 to 7.13. When the temperature range is
from 23.5°C to 25.7°C, the variation of the oxygen level
is between 3.6 to 6.2 mg/l, disturbance of water bodies is
illustrated by the presence of suspended solids with a
variation of 8.6 to 43.5 mg/l, nitrate concentration is low
in the five area (0.07-0.58mg/l) and phosphorus (0.3-0.4
mg/l).
Journal of Research in Biology (2015) 5(4): 1737-1754 1742
Nchoutndignigni et al., 2015
Fig.2. Evolution of the temperature of the water in different ponds during cycle testing
between June and November 2013.
6. Physical variables
Hydrogen Potential (pH)
The pH of the water depends on the diffusion of
carbon dioxide from the atmosphere, the balance of
respiratory and photosynthetic metabolism and the origin
of the water (Hutchinson, 1987). The geological nature
of the medium traversed, discharges wastewater
(Dussart, 1966) . It is inseparable from the temperature
values(Nisbet and Verneau, 1970) and it has been
demonstrated that the mineralization of the organic
material causes a drop in pH (Goterman, 1995). It has a
direct effect on the availability of metal ions in the
marine environment and therefore the rate of
accumulation by organisms while changing the shape of
the metal and acting on the physiology of organisms
(Bryan, 1979). The pH of pond water recorded during the
study period was 6.1 in Pond 1 (for October 2013) and
7.6 in the same pond during the month of November
2013. This small variation is due to the buffering effect
of bicarbonate ions, clearly indicating the potability of
1743 Journal of Research in Biology (2015) 5(4): 1737-1754
Nchoutndignigni et al., 2015
Fig.3. Concentration of Dissolved Oxygen water ponds during different cycle testing between
June and November 2013.
7. water (Fig.1). However, as shown in Figure 2, the curve
of the spatio-temporal variation of pH for five ponds is
highly variable and does not follow a regular law. pH
values found in different ponds studied during our cycle
do not present a danger to Oreochromis niloticus. These
changes are not easy to interpret because they are the
result of great physical and biological difficult to
highlight number. The pH ranges that are directly lethal
to fish are those located below 5mg/1 (Bremond and
Perrodon, 1979).
The water temperature (T°)
The water temperature is between 20°C and 26°C
in the pond 1, between 22 and 25.5°C in the pond 2,
between 23.5°C and 25°C in the pond 3, between 22 and
Journal of Research in Biology (2015) 5(4): 1737-1754 1744
Nchoutndignigni et al., 2015
Fig.4. Evolution of suspended solids (SS) in water of different ponds during cycle testing between
June and November 2013
8. 25°C in the pond 4, and between 24°C and 25°C in 5
ponds. From these values the minimum value is 20°C
while the maximum value is of the order of 26°C.
Observed characteristics are also strongly influenced by
factors specific to the site or the pond. In these
conditions, it’s difficult to know whether the differences
are due to special events or seasonal variations.
However, if there is a significant seasonal variation, it
must affect all ponds, or at least the majority, regardless
of site-specific characteristics. This is actually what we
see observe in Fig. 2. Five ponds have large amplitude
between August, September and November because
these periods mark the sunshine in our site. However, we
record low values between the months of June and July
since rain contributes to the decrease in water
temperature. These changes are consistent with the
observed values in other water bodies (Levêque, 1988)
values. Temperature values observed during the
experiment are very favorable for the production of
Oreochromis niloticus (Kestemont et al, 1989).
Dissolved oxygen (DO)
In our five ponds, the dissolved oxygen content
is between 2.6 and 6.5 mg/l in pond 1, between 2 and
6mg/l in pond 2, between 5 and 7mg/l in pond 3 between
3 and 5.6mg/l in pond 4, and between 2.4 and 5.8 mg/l in
pond 5 (Fig. 3). From these values we use a variation of
1745 Journal of Research in Biology (2015) 5(4): 1737-1754
Nchoutndignigni et al., 2015
Fig.5. Evolution of the turbidity of different ponds during cycle testing between
June and November 2013.
9. the concentration of dissolved oxygen between 2mg/1
and 7mg/l. The evolution of the concentration of
dissolved oxygen is a function of the climate. However,
from mid-September till October, the amplitude is
exponential in most ponds, as the oxygen content
increases with the rain. It is important to note that its
amplitude is large with the decrease in turbidity and is
less important also with higher suspended solids.
Between 2 and 3 mg/l dissolved oxygen Oreochromis
niloticus presents no particular metabolic problems.
Different levels of dissolved oxygen are favorable to the
development of Oreochromis niloticus, but they stop
eating less than 1.5mg/l and die after a long exposure
(Balarin et al., 1979). Coche (1982) reports that at a
temperature of 26-30°C, special measures need to be
considered, if the concentration of O2 on the surface of
the water falls below 3 mg/l for several days. He advises
a reduction or even a complete stop feeding and
decreased storage density with and a maximum spacing
of cages (several meters from each other).
Suspended Solids (SS)
Ponds subject to our study, located in a swampy
area in relation to the relatively low erosive potential of
the basin, the waters are loaded with suspended solids.
The low load (14.5 mg/l) exceptionally recorded in
November 2013 (Fig. 4) is probably the result of a
cessation of rains, the suspended solids show a great
difference between the values recorded. The high
Journal of Research in Biology (2015) 5(4): 1737-1754 1746
Nchoutndignigni et al., 2015
Fig. 6. Phosphorus water ponds during different cycle testing between
June and November 2013.
10. amplitude recorded (45 mg/l) in the month of June 2013
is linked to very large seasonal variations and also the
tidal dynamics. The average increase of the suspended
solids can be attributed to sudden rainstorms. Other
authors have shown that the fluctuation of the suspended
solids is mainly due to contributions from the major
collectors of the city. In addition, agents such as dynamic
-tidal currents, also contribute to the increase in the
content of suspended solids by suspension of the thin
layer of sediment (Kaimoussi, 2002). In the case of our
study, the mean values of TSS are relatively low and the
evolution follows a normal distribution.
Turbidity
The turbidity is reduces transparency due to the presence
of undissolved solids suspended in water. In this study,
we observed a change in the value of the turbidity in the
different pools (Fig. 5). It varies between 25 and 70 UTN
in pond 1, between 60 and 70 UTN in the pond 2,
between 37 and 66 UTN in the pond 3, between 38 and
55 UTN in the pond 3, and between 20 and 22 UTN in
pond 5. However, it is noticeable that these values are
recorded relating to climate change. The turbidity of the
water in the pond 1 is of high amplitude during the
month of June 2013, because of regular rainfall. It falls
1747 Journal of Research in Biology (2015) 5(4): 1737-3754
Nchoutndignigni et al., 2015
Fig. 7. Evolution of the concentration of nitrate in water from different ponds during
cycle testing between June and November 2013.
11. in September and will go up in October. Turbidity, if
appropriate with increased rainfall. This variation is the
same in all ponds. It is essential to note that the turbidity
is correlated with solids suspensions. The results of
Dagaonkar and Saksena (1992) and Garg et al
(2006b) also reported high turbidity during rainy
season. Silt, clay and other suspended particles
contribute to the turbidity values, while during
winter and settlement of silt, clay results low turbidity
during the summer season. Nevertheless, it is essential
to note that the turbidity correlates with solids
suspensions and may be related to fertilization
(Dabbadie, 1996).
Chemical variables
Phosphate
Phosphate is an essential component of the
organic matter and it’s important nutrient for living
organisms. However it must be considered as a pollutant,
when present at high concentrations in the environment.
At the end of our study, the concentration of phosphorus
in ponds 1 and 2 is between 0.3 and 0.5 mg/l; between 0
and 1mg/l in pond 3 between 0.1 and 0.6mg/l, for ponds
and between 0 and 1mg/l for the pond 5(Fig. 6). This
finding is agreement with that of Udaipur lakes (Ranu,
2001, Chisty 2002). Concentrations in water around 0.5
mg/l is a pollution index (Rodier et al.,1996). According
to the values, the water bodies are indications of
pollution. Release of phosphate in aquatic ecosystems
are one of the most serious environmental problems
because, they help to accelerate the eutrophication of
these environments.
Nitrate (NO3
-
)
Nitrates represent the final stage of the oxidation
of nitrogen. Their presence in water is a evidence of a
good recovery from organic pollution. Human activity is
certain when concentrations exceeding 12 mg/l
(Perrodon and Bremond, 1979). Nitrates come primarily
from runoff in the watershed (nitrogen fertilizers).
Nitrate can also come from domestic sewage and
industrial wastewater. The evolution of nitrates is
dominated by two large seasonal variations in August
2013 and November 2013. At ponds, this depletion of the
areal concentration of nitrates is due to measures taken in
the security system of the dam safety present between the
rivers (Olezoa) and experimental ponds. We can say that,
the traces exist in ponds resulting from agricultural
practices located around the study site whereas lateral
inflows of nitrate leaches from agricultural land very
busy this element are not overlooked . Furthermore, the
results reveal low intake of nitrates between 0 and 1 mg/
l. The longitudinal profiles of the ions have the same
shape for all pools as shown in Figure 7. Other authors
found that nitrates can reach values higher values (24
mg/l), there by suggesting the presence of organic matter
Journal of Research in Biology (2015) 5(4): 1737-1754 1748
Nchoutndignigni et al., 2015
Fig. 8. Evolution of the average body weight of
Oreochromis niloticus with different experimental diets
(PP, MS, MS+PP, T1, T0)
Fig.9. Evolution of the average body length of
Oreochromis niloticus with different experimental diets
(PP, MS, MS+PP, T1, T0)
12. (Mergaoui et al., 2003). Gassama and Violette (2002)
explained the increase of nitrate by the input of nitrogen
fertilizers.
Zootechnical parameters and indices calculated
The test foods were accepted by the fish. In each
pond fertilized with a particular food, the values of
growth performance such as the average final weight
varied between 24.93g ± 16.8g and 59.5g ± 39g (Fig.8).
The size changes with a final average variability between
13cm ± 2.2cm and 22.5cm ± 5.4cm (Fig. 9). The daily
growth for when it is 0.1g/d ± 0.3 to 0.01g/d ± 0.02, and
the survival rate between 60% ±1.01 and 98% ± 2.6 are
recorded in Table 2. These observations show that these
areas are more environmentally friendly for farming
Oreochromis niloticus. By cons, in the pond 2 and 4,
growth remained low (0.1g/l). This low rate is partly due
to the chemical composition of the food eaten at the pond
2, which could cause a decline in their growth (Moriarty,
1973). Moreover, this low growth rate is related to the
average biomass (35.5 and 24.93g in ponds 2 and 4)
respectively observed at the end of cycle.
As a first approximation we can therefore
suggest that the food ingested by the fish takes the full
responsibility. These results are similar to observations
made by Kaushik et al. (1995) and could be likened to
the physiological adaptations exhibited by herbivorous
1749 Journal of Research in Biology (2015) 5(4): 1737-1754
Nchoutndignigni et al., 2015
Fig.10.Experimental device
14
3
Pond 4 with NtPond 3 with Ms+Pp
14
3
14
3
Pond 1 with Pp Pond 2 with Ms
c 14
3
5
2
22
2
3
14
2
Pond 5 with Cm
Legend. (1) Entry of water; (2) Water outlet; (3) Plate of the pond; (4): Composter; (5) Basin water retention;
Pp: Pennisetum purpureum; Ms Musa sapientum; Cm: Chicken manure; Nt: No treatment
13. fish, allowing them to optimize the quality of their food
in low food availability (Melard, 1986). These results are
also related to the low stocking densities and applied to
environmental conditions, especially temperature and
oxygen that appear to be conducive to efficient use of
available food. Similar observations described in the
natural environment, such as Chano lake in Ethiopia
(Getachew , 1993) confirm the lower trophic requirement
Oreochromis niloticus and its ability to take advantage of
food sources of varying quality.
Journal of Research in Biology (2015) 5(4): 1737-1754 1750
Nchoutndignigni et al., 2015
Fig.11. Localization of the study site
14. CONCLUSION
This study allowed us to obtain the optinal
parameters for the successful growth of oreochromis
niloticus: (1)pH (6.8 to 7.13), the temperature (23.2 to
25.7 °C), dissolved oxygen (4.43 to 6.2mg/l), turbidity
(20.6 to 76 NTU) and TSS (8.6 to 43.5g/l), Nitrates (0.07
to 0.5mg / l) and phosphates (0.3 to 0.4mg/l). (2) The
production parameters for growth performance of
Oreochromis niloticus are 43g, 35.5g, 59.5g, 24.93g and
50.23g with 60 %, 67 %, 98 % and 70 % and 97 %
respectively is 1,2,3,4 and 5 ponds. This study shows that
pond 3 revealed the best performance. This work,
although carried to completion, is far from having been
without difficulties . Pond fertilization and water quality
have a capital interest in the development of freshwater
fish. This work has undeniably, like any human
endeavor, weaknesses, imperfections and limitations . In
addition, it is necessary to improve the appearance of
fertilizing ponds with other forages. Future work will
bring an improvement to fish yields to better exploit for
exploiting the food self-sufficiency.
ACKNOWLEDGMENTS
The authors wish to thank Mr. DOUNIA, teacher
at the Higher Teacher Training College of Yaounde,
Laboratory of Zoology for his practical advice in the
analysis of the results of this work. We also thank the
Master and PhD students in the laboratory of
Hydrobiology environment who participated in the
sampling sessions as a part of our research work.
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