This document discusses the important physical, chemical, and biological properties for successful fish pond culture. It covers factors like temperature, depth, turbidity, light, dissolved oxygen, pH, carbon dioxide, hardness, alkalinity, ammonia, phosphorus, and dissolved solids. Maintaining optimal ranges for these various properties can ensure high fish productivity, prevent disease outbreaks, and support healthy aquatic ecosystems in the pond. The document emphasizes how closely managing water quality, food production, and fish health are interlinked for sustainable aquaculture.
The transfer of fish seed from the hatchery or place of collection to the rearing pond is called transport of fish seed. The seed fish include fry and fingerlings.
Carps form the mainstay of aquaculture in India contributing over 85% of the total aquaculture production There are 61,259 species of vertebrates recognized world; over 30,700 are fish species of which 8,411 ore fresh water while 11,650 are marine. In India 2,163 spp. are fin fishes have been recorded from upland cold water (157; 7.26%) warm water of the plain (54; 20.99%), Brackish water (182; 8.41%) and marine environment (1,370; 63.43%). Some of these species are cultured at commercial level which covering a lot varieties of fin fishes The three Indian major carps, namely Catla (Catla catla), Rohu (Labeo rohita) and Mrigal (Cirrhinus mrigal) contribute the bulk of production to the extent of 75 to85 percent of the total fresh water fish production, the three exotic carp such as Silver carp (Hypophthalmichthys molitrix) and Common carp (Cyprinus carpio ), Grass carp (Ctenopharyngodon idella )form the second important group to incorporate several other medium and minor carp and into the carp poly culture system several method were used because of their region specific consumer preference and higher market demand.
History
Carp culture in India was restricted only to a homestead backyard pond activity in west Bengal and Odisha until late 1950 s with seed from riverine sources as the only input resulting low level of production the technological breakthrough breeding of carp through hypophysation in 1957 freshwater aquaculture of the country the country till 1984 virtually laid the foundation of scientific carp farming in the country.
Important characteristics of Indian major carps:-
Indian major carp grow fast and can reproduce even in artificial ponds. They feed upon phytoplankton, zooplankton, decaying organic matter, aquatic plant etc. stomach is absent in the alimentary canal of the major carps. Three types of Indian major carps are cultured in
Introduction
Fish Health Management GOALS
Principles of fish health management
Factors affecting fish health
Common symptoms of diseases
General preventive measures
Proper Health Management through Manipulating the disease triangle
Conclusion
References
These topic contains global scenario of aquaculture, demand consumption scenario and present status of aquaculture in India. These presentation also contain constraints, future prospects and challenges in aquaculture. Different aquaculture practices throughout the world.
cultured shrimp are getting affected by various disease.some of them are acute and some chronic. and the curing is very harder for a farmer so it is better suggested for safety precaution and proper hygiene while culturing.and the affected shrimp in cured with antibiotics is not accepted by anyone in the export business. so, let yourself find out the various shrimp disease their cure and proper management in this seminar.
Nursery Pond Management
Objectives:
To obtain required amount of desirable species at desired time at desired price all the year round.
After completing these stages of management the nursery pond is prepared for rearing fry and fingerlings.
The next stage is to select culturable species for stocking in the prepared pond and other management.
If we prepare a good nursery pond we will get a good production .
The transfer of fish seed from the hatchery or place of collection to the rearing pond is called transport of fish seed. The seed fish include fry and fingerlings.
Carps form the mainstay of aquaculture in India contributing over 85% of the total aquaculture production There are 61,259 species of vertebrates recognized world; over 30,700 are fish species of which 8,411 ore fresh water while 11,650 are marine. In India 2,163 spp. are fin fishes have been recorded from upland cold water (157; 7.26%) warm water of the plain (54; 20.99%), Brackish water (182; 8.41%) and marine environment (1,370; 63.43%). Some of these species are cultured at commercial level which covering a lot varieties of fin fishes The three Indian major carps, namely Catla (Catla catla), Rohu (Labeo rohita) and Mrigal (Cirrhinus mrigal) contribute the bulk of production to the extent of 75 to85 percent of the total fresh water fish production, the three exotic carp such as Silver carp (Hypophthalmichthys molitrix) and Common carp (Cyprinus carpio ), Grass carp (Ctenopharyngodon idella )form the second important group to incorporate several other medium and minor carp and into the carp poly culture system several method were used because of their region specific consumer preference and higher market demand.
History
Carp culture in India was restricted only to a homestead backyard pond activity in west Bengal and Odisha until late 1950 s with seed from riverine sources as the only input resulting low level of production the technological breakthrough breeding of carp through hypophysation in 1957 freshwater aquaculture of the country the country till 1984 virtually laid the foundation of scientific carp farming in the country.
Important characteristics of Indian major carps:-
Indian major carp grow fast and can reproduce even in artificial ponds. They feed upon phytoplankton, zooplankton, decaying organic matter, aquatic plant etc. stomach is absent in the alimentary canal of the major carps. Three types of Indian major carps are cultured in
Introduction
Fish Health Management GOALS
Principles of fish health management
Factors affecting fish health
Common symptoms of diseases
General preventive measures
Proper Health Management through Manipulating the disease triangle
Conclusion
References
These topic contains global scenario of aquaculture, demand consumption scenario and present status of aquaculture in India. These presentation also contain constraints, future prospects and challenges in aquaculture. Different aquaculture practices throughout the world.
cultured shrimp are getting affected by various disease.some of them are acute and some chronic. and the curing is very harder for a farmer so it is better suggested for safety precaution and proper hygiene while culturing.and the affected shrimp in cured with antibiotics is not accepted by anyone in the export business. so, let yourself find out the various shrimp disease their cure and proper management in this seminar.
Nursery Pond Management
Objectives:
To obtain required amount of desirable species at desired time at desired price all the year round.
After completing these stages of management the nursery pond is prepared for rearing fry and fingerlings.
The next stage is to select culturable species for stocking in the prepared pond and other management.
If we prepare a good nursery pond we will get a good production .
How to Split Bills in the Odoo 17 POS ModuleCeline George
Bills have a main role in point of sale procedure. It will help to track sales, handling payments and giving receipts to customers. Bill splitting also has an important role in POS. For example, If some friends come together for dinner and if they want to divide the bill then it is possible by POS bill splitting. This slide will show how to split bills in odoo 17 POS.
The Indian economy is classified into different sectors to simplify the analysis and understanding of economic activities. For Class 10, it's essential to grasp the sectors of the Indian economy, understand their characteristics, and recognize their importance. This guide will provide detailed notes on the Sectors of the Indian Economy Class 10, using specific long-tail keywords to enhance comprehension.
For more information, visit-www.vavaclasses.com
Students, digital devices and success - Andreas Schleicher - 27 May 2024..pptxEduSkills OECD
Andreas Schleicher presents at the OECD webinar ‘Digital devices in schools: detrimental distraction or secret to success?’ on 27 May 2024. The presentation was based on findings from PISA 2022 results and the webinar helped launch the PISA in Focus ‘Managing screen time: How to protect and equip students against distraction’ https://www.oecd-ilibrary.org/education/managing-screen-time_7c225af4-en and the OECD Education Policy Perspective ‘Students, digital devices and success’ can be found here - https://oe.cd/il/5yV
This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
2024.06.01 Introducing a competency framework for languag learning materials ...
Water quality parameters
1. COURSE TITLE: AQUATIC ENVIRONMENT MANAGEMENT
COURSE CODE: AQC503
BY
Madhusmita Kalita
AEM-MA-704
IMPORTANT PHYSICAL, CHEMICAL
AND BIOLOGICAL PROPERTIES FOR
FISH POND CULTURE
2. INTRODUCTION
Successful pond culture operations mainly depend on
maintenance of a healthy aquatic environment and
production of sufficient fish food organisms in ponds.
Physical, chemical and biological factors play an
important role in governing the production of fish
food organisms and fish production in the pond.
If the water quality is maintained with utmost care, the
occurrence of many fish diseases can also be
prevented.
A healthy water is a boon to fish culture
3. PHYSICAL FACTORS
Temperature
Temperature influence all metabolic and physiological activities and
life processes such as feeding, reproduction, movement and
distribution of aquatic organisms.
Temperature also affects the speed of chemical changes in soil and
water. The oxygen content of water decreases with rise in
temperature.
Most of the tropical fish cann’t survive below 100C. Tilapia cann’t
survive below 80C.
Indian major carps are able to tolerate a wide range of temperature
(20 to 370C), below 16oC and above 400C prove fatal to them. Many
exotic species can’t survive at higher temperature.
4. • Fishes native to cold water (e.g. Silver Carp) are unable to
survive on the plains due to higher water temperature in
summer months.
• Both silver carp and grass carp prefers temperature below 30o
C. Hence, a knowledge of the range of temperature variation is
necessary before introducing fishes for culture in a pond.
• Observation shown that instead of an annual turnover, as found
in temperate climates, a daily turnover takes place in tropical
ponds.
• During the nights, circulation takes place, bringing about a
mixing of the water. This turnover is of extreme importance in
the circulation of oxygen and nutrients in pond water.
5. Water Depth
Depth determines the temperature, circulation pattern of water and
the extent of photosynthetic activity.
In shallow ponds, sunlight penetrates up to the pond bottom and
facilitates an increase in the productivity.
A depth of 1-2 meters is considered optimal for biological
productivity of a pond. If the depth is very less, water gets
overheated and thus has an adverse effect on the survival of the
fish.
In arid and semi-arid areas, water depth should be more than 2
meters.
The excess water from pond can be removed through pumping or
through the use of outlet in the embankment.
If the water depth is reduced then from a nearby source it should be
filling up.
6. Turbidity (Transparency)-1
1
Transparency --------------
Turbidity
Turbidity of water The amount of suspended organic and inorganic matter.
Turbidity and transparency both are optical properties of light
Transparency cause light to be transmitted in straight line through the
sample.
while turbidity causes light to be scattered thereby restricts its penetration
and reduce photosynthetic activity.
Suspended particles causing turbidity may also adsorb considerable amount
of nutrient elements like phosphate, K, N2 in their ionic form and making
them unavailable for plankton production,
7. Turbidity due to profusion of plankton is an indication of pond’s high
fertility
But that caused by silt or mud beyond a limit (up to 4% by volume) is
harmful to fish and fish food organisms.
Turbidity due to high concentration of silt, mud or algal growth causes death
of fishes due to choking of gills.
Suspended particles may be settled by application of lime
Algal bloom can be restricted by application of alum in case of unicellular
algae and copper sulphate in case of filamentous algae.
If the pond water is covered by floating weeds, Wolfia. sp (microweeds) or
Lemna minor, Lemna major, Spirodella for one week then also the algal
growth is checked due to lack of penetration of sunlight.
8. Light
Light is an important factor influencing productivity.
Penetration of light depends upon the available intensity of the incident
light, which varies with the geographical locations of the pond and turbidity
of water.
In shallow ponds, light reaches upto the bottom and causes heavy growth
of vegetation.
Light controls the flora and oxygen content of the water of the pond.
Shade provided by the surrounding vegetation affects the incidence of light
on the pond.
Advantage of shading effect in often taken in pisciculture effect for the
control of algal blooms and submerged weeds.
9. Water Colour
Water gets its colour due to phytoplankton, zooplankton, sand
particles, organic particles and metallic ions in the pond water.
Water used for fish culture should be clear, either colourless or
light green or blue in colour.
Water colour of golden or yellow brown indicates the abundant
diatoms.
Water becomes greenish in colour when phytoplankton is more,
develops a brown colour due to zooplankton and mud colour
due to more sand grains.
Water with black, blackish green, dark brown, red, yellow
colours are not good for culture. These colours are due to the
presence of more phytoplankton, bad pond bottom and acids in
the water.
The red colour of water is due to the presence of high levels of
iron and death of phytoplankton (phytoerythrin released).
10. Biological characteristics
Biological characteristics of an aquaculture pond refers to the
aquatic organisms that live within the pond. This includes both
plants and animals.
The relationship between aquatic plants and animals is known
as a trophic level or a food chain
Bacteria form the base of the food chain within an aquaculture
pond.
Bacteria break down organic matter to produce nutrients such as
phosphorus and nitrogen, and carbon dioxide (CO2).
11. These products are then utilised by phytoplankton, microscopic algae,
to produce oxygen via photosynthesis.
Oxygen and phytoplankton are then consumed by zooplankton which
are tiny aquatic organisms.
Fish then feed on zooplankton as well as larger aquatic plants and
supplementary feed that may be added to the aquaculture ponds.
Uneaten supplementary feed, dead aquatic organisms (including
planktonic organisms and aquaculture species) and animal wastes
will settle on the pond floor.
Bacteria will feed on this decaying organic matter and the cycle will
commence again.
12.
13. CHEMICAL FACTORS
Dissolved Oxygen
Sources of Oxygen (O2):
Absorption from air at the water surface.
Photosynthesis of chlorophyll bearing organism
inhabiting pond.
Consumption of Oxygen (O2):
Respiration of aquatic animals and plants in day and
night.
Decomposition of organic matter
14. Value of dissolved O2 depends on temperature, partial
pressure of O2 and water salinity, photosynthetic
activity.
When temperature increases dissolved O2 decreases.
When partial pressure of O2 in contact with water at
the surface increases amount of O2 dissolved in water
is also increases.
When concentrated of dissolved salts (salinity)
increases dissolved O2 concentration decreases. At
00C, fresh water contains slightly over 2.0 mg/l O2
than sea water (35% salinity).
Since O2 is a byproduct of the photosynthesis, it
increases with increase in the rate of photosynthesis.
15. To Mitigate the oxygen deficiency
Direct ways or Physical Methods :
Beating by stick on all sides of ponds;
Use Aerator
Introduce fresh oxygenated water from other areas to pond.
Pumping of water by water pump
Chemical methods:
i) Apply lime @ 60 – 70 Kg/ha.
ii) Apply KMnO4 @ 4 Kg/ha
iii). Use UltaSil-Aqua (Aqua Zeolite) of Neospark, Drugs and Chemical Private Ltd,
Hyderabad @ 10 to 40 Kg per acre.
iv). Use Aqua Clean of G M Chemicals, Ahmedabd @ 25 – 35 Kg per acre at every
20-25 days.
Oxygen deficiency in lakes and river cause migration of fish, attack of parasites,
fungus diseases and death due to suffocation.
16. pH levels
The pH is the measure of the hydrogen ion (H+) concentration in soil
or water.
The pH scale ranges from 0 to 14 with a pH of 7 being neutral. A pH
below 7 is acidic and an pH of above 7 is basic. A favorable pH range
is between 6.5 and 9 (optimum 7.5-8.5)however this will alter slightly
depending on the culture species
The pH in ponds will rise during the day as phytoplankton and other
aquatic plants remove CO2 from the water during photosynthesis.
The pH decreases at night because of respiration and production of
CO2 by all organisms.
Signs of sub-optimal pH include increase mucus on the gill surfaces
of fish, damage to the eye lens, abnormal swimming behavior, fin
fray, poor phytoplankton and zooplankton growth and can even cause
death.
17. Fig: Diurnal fluctuations of pH
will occur due to the amount of
aquatic life within a pond. With
higher algae concentrations, more
CO2 is removed from the system
and hence pH levels will rise. The
reverse will occur at night when
more CO2 is produced therefore
leading to a drop in pH levels.
18. Free CO2
Sources of CO2 in natural water
i) From atmosphere:
Through rain water contains 0.3 – 0.6 ppm.
Air in contact with water surface.
ii) Respiration of aquatic plants and animals .
iii) Decomposition of organic matter in water body.
Consumption of CO2
Photosynthesis by aquatic plants and phytoplankton
for production of carbohydrates.
19. Carbon dioxide is present in three forms bound CO3
- -, half
bound HCO3
- and free state CO2. When CO2 comes in contact
with water, it produce carbonic acid
H2O + CO2 = H2CO3
which displays its weak acidic character through dissociation
H2CO3 = H+ + HCO3
- = 2H+ + CO3
- -
Just before day-break, concentration of CO2 is highest and
water is therefore, most acidic.
It increases the acidity of water
20. Water alkalinity and hardness
Alkalinity refers to amount of carbonates and bicarbonates and
hydroxides in the water and water hardness refers to the
concentration of divalent metallic cations like calcium,
magnesium, strontium in water.
As calcium and magnesium bond with carbonates and
bicarbonates, alkalinity and water hardness are closely interrelated
and produce similar measured levels.
Waters are often categorised according to degrees of hardness as
follows:
0 – 75 mg/l soft
75 – 150 mg/l moderately hard
150 – 300 mg/l hard
over 300 mg/l very hard
It is recommended that alkalinity and hardness levels are
maintained around 50 to 300 mg/l which provides a good buffering
(stabilising) effect to pH swings that occur in ponds due to the
respiration of aquatic flora and fauna
21. Ammonia
Ammonia in ponds is produced from the decomposition of organic wastes
resulting in the breakdown of decaying organic matter such as algae, plants,
animals and uneaten food.
Ammonia is present in two forms in water – as a gas NH3 or as the
ammonium ion (NH4+).
Ammonia is toxic to culture animals in the gaseous form and can cause gill
irritation and respiratory problems.
Ammonia levels will depend on the temperature of the pond’s water and its
pH. For example at a higher temperature and pH, a greater number of
ammonium ions are converted into ammonia gas thus causes an increase in
toxic ammonia levels within the freshwater pond.
If high levels are ammonia are present within the pond’s water, a number of
measures can be taken. These include:
reduce or stop feeding,
flush the pond with fresh water,
reduce the stocking density,
aerate the pond,
in emergencies – reduce the pH level.
22. PHOSPHORUS
Phosphorus is recognized to the most critical single factor in the maintenance of
pond fertility.
It occurs in three forms:
1. The soluble inorganic phosphate phosphorus (PO4)
2. Soluble organic phosphorus and
3. The particulate organic phosphorus occurring in plankton, detritus and
sedimentation.
Out of these three forms, form PO4 i.e. soluble inorganic phosphate phosphorus
or dissolved phosphorus takes part in production.
It is required for cell division, preparation of fat, protein, high energy
compounds (ATP, ADP, AMP) etc in the body.
If pond soil is acidic, phosphorus become unavailable and stays in compound
form with Fe, Al, Mn, Zn,
For this reason, phosphate fertilizers are applied with lime in acidic soil.
But, if the condition is highly alkaline, the phosphate again remains in pond soil
as a compound form with Ca and Mg.
Availability of phosphorus is highest near neutral pH.
Slide-1
23. Dissolved Solids
The total concentration of dissolved solids in a water body is a useful
parameter in deserving chemical density as a fitness factor that
contributes to the productivity of the water.
Electrical conductivity, which gives the total amount of ionized
materials is an important measure of total dissolved solids present in
water and is usually expressed as micromhos.
Electrical conductivity above 400 Mmhos does not limit
productivity but productivity does not increase proportionately with
conductivity.
Dissolved solids may be organic or inorganic.
Inorganic dissolved solids are: metallic ions (eg. Ca, Mg, Na, K, Fe)
in combination with anions like Cl-, SO4
-2, CO3
-2, HCO3
-, OH-, PO4
-
3, NO3
-, NO2
- etc. and there may be trace elements like Ni, Co, Mn,
Zn, Cu, Cr, Al, Silica, etc.
Whereas, organic dissolved solids are: organic state of nitrogen,
phosphorus and sugars, acids, fats, vitamin etc.
24. Optimum water quality
requirement for a fish pond:
Sl. No. Parameter Fresh
Water
Brakish
Water
Sea Water
1 Colour Clear water
with greenish
hue<100 color
units
Clear water with
greenish
hue<100 color
units
Clear water with
greenish
hue<100 color
units
2 Transparency 20-35cm 26-35cm 26-35cm
3 Clay-turbidity <30ppm <30ppm <30ppm
4 TDS(ppm) <500 <500 <500
5 pH 6.7-9.5 7.0-8.7 7.0-8.5
6 TSS(ppm) 30-200 25-200 25-200
7 Hardness(pp 30-180 >50 >50
26. CONCLUSION
Water quality varies considerably at different geographical
locations.
Fish can use some water supplies considered impaired for
human use, even some saline waters have aquaculture
potential.
Water quality affects growth and well being of fish. Therefore,
water quality should be of great importance to the
aquaculture.
Water quality varies with time to time and therefore requires
regular monitoring.
It is equally important to know how to interpret the water
quality parameters that are measured to maintain the health
and well being of their fish stock.