Shore based aquaculture or coastal brackish water aquaculture is practiced in many countries. There are various methods of traditional culture system based on the local conditions. Shrimp culture is the main attraction of this culture system. Some other fishes and other organisms like crabs, bivalves and seaweeds are also farmed. This type of culture system is mainly found in south East Asia.
Finfish breeding and hatchery management pdfKartik Mondal
Rivers were the major source of freshwater fish seed in India during 1950’s and 1960’s.
Over the years, the riverine contribution has declined and at present forms only a supplementary source, constituting less than 5% of the country’s total fish seed production.
The Ganga, the Brahmaputra and the Indus river systems in the North and the Peninsular East coast and the West coast river systems in the South are the important natural sources of fish seed.
Finfish breeding and hatchery management pdfKartik Mondal
Rivers were the major source of freshwater fish seed in India during 1950’s and 1960’s.
Over the years, the riverine contribution has declined and at present forms only a supplementary source, constituting less than 5% of the country’s total fish seed production.
The Ganga, the Brahmaputra and the Indus river systems in the North and the Peninsular East coast and the West coast river systems in the South are the important natural sources of fish seed.
Fertilized fish eggs are known as Fish seeds. In simple words, they are the baby fishes used for seeding new Ponds in fisheries. Fish seed transportation is a process by which transfer of fish seed from the hatchery or place of collection to the rearing ponds.
Generalized and specific definition of pond and the types relating their size, use, construction method were illustrated. Besides the culture system of fish and aquatic organisms and their types were also described.
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
Aquaculture is the most reliable sector to the providing world nutrias food. It is all depended on the cultivable species. Asian seabass is one of the candidate species for aquaculture because of the wide range of water quality tolerance, growth performance, and consumer preference. The Indian and Western Pacific Oceans are where Asian seabass is found in its natural habitat. It can be cultured in the earthen pond, floating or stationer cages, and recirculating system. Seed resources are available in rivers and lakes of fresh water, but aquaculture is the depending on the hatchery that produces seed because of the superior growth production. In the nursery phase, cannibalism is predominant in Asian seabass cultivation, which will improve via the grading of a shooter. Feeding is one of the important management for good growth performance and reducing cannibalism to give the optimum feed requirements. The growth rate of the Asian seabass is 400-600 g in 4 to 6 months. Asian seabass farmers are suffering from some infectious and non-infection diseases, it will improve via the good management practices of the culture promises. In this review paper, some key points of Asian seabass farming are covered for better understanding.
This slide is about a pearl spot fish which includes about its habit, habitat ,morphology, food and feeding, breeding behaviour, hatching, larval rearing, embryonic development, nutritive values, farming practices, seed production and pond preparation...
.DEFINITION OF FISH PHARMACOLOGY:
“Fish pharmacology is essential for undertaking treatment of fishes using any therapeutic chemicals or drugs.”
“Pharmacology is the study of the interaction of chemicals with living system.”
“Pharmacology” is morden science which correlated other biological sciences, eg., Biochemistry , Physiology Microbiology , Medicine , and Genetics.
“Pharmacology is the branch of biology concerned with the study of drug action.”
“Pharmacology is the study of drugs including their origins, history, uses, and properties. It mainly focuses on the actions of drugs on the body.”
“Pharmacology is the study of drugs and theire actions on the body”.
“Pharmacology is the study of substance that interact with living systems through chemical process, especially by binding to regulatory molecules &activating or inhibiting normal body process.
Fig. 1
3. HISTORY OF FISH PHARMACOLGY:
Pharmacology emerged as its own discipline in the 19th Century, branching off from research done in fields of science such as organic chemistry and physiology. Oswald Schmiedeberg, who was born in what is now Latvia in 1838, is considered the father of pharmacology. His doctoral thesis was on the measurement of chloroform levels in blood, and he went on to become a professor of pharmacology at the University of Strasburg, where he ran an institute of pharmacology. There, he studied chloroform, which was used as an anesthetic, chloral hydrate, a sedative and hypnotic, and muscarine, a compound isolated from the mushroom Amanita muscaria that stimulates the parasympathetic nervous system and has been used to treat various diseases such as glaucoma.
In 1890, John Jacob Abel became the first pharmacology chair in the United States, at the University of Michigan. He later went to Johns Hopkins University in Baltimore. Abel was the first to isolate the hormone epinephrine from the adrenal gland, isolate histamine from the pituitary gland, and make pure crystalline insulin. Animals such as dogs, cats, pigeons, and frogs were used to test pharmacological substances. Humans were even used as test subjects. Sometimes they suffered through severe adverse effects from these substances, such as when the German pharmacist Friedrich Serturner and three of his friends had poisoning for several days from an alkaloid that Serturner had isolated from opium. This alkaloid was later named morphine, after the Ancient Greek god of sleep, Morpheus.
Oswald Schmiedeberg was a brilliant scientist. He studied the pharmacology of various compounds, including chloroform, and published an important text called the Outline of Pharmacology. There, he studied chloroform, which was used as an anesthetic, chloral hydrate, a sedative and hypnotic, and muscarine, a compound isolated from the mush to the field, Schmiedeberg is now known as 'the father of pharmacology'.
Introduction of Fish and Fisheries of India.
• Freshwater Fish: Fish that spend most or all of their life in freshwaters, such as rivers and lakes, having a salinity of less than 0.5 ppt. Around 40% of all known species of
fish are found in freshwater.
They may be divided into Coldwater Fish (5-20 °C); examples: Mahseer, Trout, etc., and Warmwater Fish (25 35 °C); example: Carps, Catfish, Snakeheads, Featherbacks, etc.
• Brackishwater Fish: Fish that can tolerate a wide range of salinity (0.5 30.0 ppt)
and live in backwaters, estuaries and coastal waters.
Example: Mullet, Milkfish, Seabass, Pearlspot, Mudskipper, etc.
• Marine Fish: Fish that spend most or all of their life in seawater, such as Seas and
Oceans, having salinity above 30 ppt. There are about 240 species contributing to
the marine fisheries. Example: Sardines, Mackerel, Ribbonfish, Anchovies, Grouper, Cobia, Tuna, etc.
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.
A short description about magur fish.The walking catfish (Clarias batrachus) is a species of freshwater airbreathing catfish native to Southeast Asia, but also introduced outside its native range where it is considered an invasive species. It is named for its ability to "walk" across dry land, to find food or suitable environments. While it does not truly walk as most bipeds or quadrupeds do, it has the ability to use its pectoral fins to keep it upright as it makes a wiggling motion with snakelike movements.[2] This fish normally lives in slow-moving and often stagnant waters in ponds, swamps, streams and rivers, flooded rice paddies or temporary pools which may dry up
Fertilized fish eggs are known as Fish seeds. In simple words, they are the baby fishes used for seeding new Ponds in fisheries. Fish seed transportation is a process by which transfer of fish seed from the hatchery or place of collection to the rearing ponds.
Generalized and specific definition of pond and the types relating their size, use, construction method were illustrated. Besides the culture system of fish and aquatic organisms and their types were also described.
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
Aquaculture is the most reliable sector to the providing world nutrias food. It is all depended on the cultivable species. Asian seabass is one of the candidate species for aquaculture because of the wide range of water quality tolerance, growth performance, and consumer preference. The Indian and Western Pacific Oceans are where Asian seabass is found in its natural habitat. It can be cultured in the earthen pond, floating or stationer cages, and recirculating system. Seed resources are available in rivers and lakes of fresh water, but aquaculture is the depending on the hatchery that produces seed because of the superior growth production. In the nursery phase, cannibalism is predominant in Asian seabass cultivation, which will improve via the grading of a shooter. Feeding is one of the important management for good growth performance and reducing cannibalism to give the optimum feed requirements. The growth rate of the Asian seabass is 400-600 g in 4 to 6 months. Asian seabass farmers are suffering from some infectious and non-infection diseases, it will improve via the good management practices of the culture promises. In this review paper, some key points of Asian seabass farming are covered for better understanding.
This slide is about a pearl spot fish which includes about its habit, habitat ,morphology, food and feeding, breeding behaviour, hatching, larval rearing, embryonic development, nutritive values, farming practices, seed production and pond preparation...
.DEFINITION OF FISH PHARMACOLOGY:
“Fish pharmacology is essential for undertaking treatment of fishes using any therapeutic chemicals or drugs.”
“Pharmacology is the study of the interaction of chemicals with living system.”
“Pharmacology” is morden science which correlated other biological sciences, eg., Biochemistry , Physiology Microbiology , Medicine , and Genetics.
“Pharmacology is the branch of biology concerned with the study of drug action.”
“Pharmacology is the study of drugs including their origins, history, uses, and properties. It mainly focuses on the actions of drugs on the body.”
“Pharmacology is the study of drugs and theire actions on the body”.
“Pharmacology is the study of substance that interact with living systems through chemical process, especially by binding to regulatory molecules &activating or inhibiting normal body process.
Fig. 1
3. HISTORY OF FISH PHARMACOLGY:
Pharmacology emerged as its own discipline in the 19th Century, branching off from research done in fields of science such as organic chemistry and physiology. Oswald Schmiedeberg, who was born in what is now Latvia in 1838, is considered the father of pharmacology. His doctoral thesis was on the measurement of chloroform levels in blood, and he went on to become a professor of pharmacology at the University of Strasburg, where he ran an institute of pharmacology. There, he studied chloroform, which was used as an anesthetic, chloral hydrate, a sedative and hypnotic, and muscarine, a compound isolated from the mushroom Amanita muscaria that stimulates the parasympathetic nervous system and has been used to treat various diseases such as glaucoma.
In 1890, John Jacob Abel became the first pharmacology chair in the United States, at the University of Michigan. He later went to Johns Hopkins University in Baltimore. Abel was the first to isolate the hormone epinephrine from the adrenal gland, isolate histamine from the pituitary gland, and make pure crystalline insulin. Animals such as dogs, cats, pigeons, and frogs were used to test pharmacological substances. Humans were even used as test subjects. Sometimes they suffered through severe adverse effects from these substances, such as when the German pharmacist Friedrich Serturner and three of his friends had poisoning for several days from an alkaloid that Serturner had isolated from opium. This alkaloid was later named morphine, after the Ancient Greek god of sleep, Morpheus.
Oswald Schmiedeberg was a brilliant scientist. He studied the pharmacology of various compounds, including chloroform, and published an important text called the Outline of Pharmacology. There, he studied chloroform, which was used as an anesthetic, chloral hydrate, a sedative and hypnotic, and muscarine, a compound isolated from the mush to the field, Schmiedeberg is now known as 'the father of pharmacology'.
Introduction of Fish and Fisheries of India.
• Freshwater Fish: Fish that spend most or all of their life in freshwaters, such as rivers and lakes, having a salinity of less than 0.5 ppt. Around 40% of all known species of
fish are found in freshwater.
They may be divided into Coldwater Fish (5-20 °C); examples: Mahseer, Trout, etc., and Warmwater Fish (25 35 °C); example: Carps, Catfish, Snakeheads, Featherbacks, etc.
• Brackishwater Fish: Fish that can tolerate a wide range of salinity (0.5 30.0 ppt)
and live in backwaters, estuaries and coastal waters.
Example: Mullet, Milkfish, Seabass, Pearlspot, Mudskipper, etc.
• Marine Fish: Fish that spend most or all of their life in seawater, such as Seas and
Oceans, having salinity above 30 ppt. There are about 240 species contributing to
the marine fisheries. Example: Sardines, Mackerel, Ribbonfish, Anchovies, Grouper, Cobia, Tuna, etc.
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.
A short description about magur fish.The walking catfish (Clarias batrachus) is a species of freshwater airbreathing catfish native to Southeast Asia, but also introduced outside its native range where it is considered an invasive species. It is named for its ability to "walk" across dry land, to find food or suitable environments. While it does not truly walk as most bipeds or quadrupeds do, it has the ability to use its pectoral fins to keep it upright as it makes a wiggling motion with snakelike movements.[2] This fish normally lives in slow-moving and often stagnant waters in ponds, swamps, streams and rivers, flooded rice paddies or temporary pools which may dry up
Modern developments in transport technology are from two levels; one is from an understanding of internal physiological mechanisms of the fish and the optimal requirements, ensuring maximum survival of fish under transport and the other is from a study of the environmental parameters of the medium in which fish are transported. Under anaesthesia fish can be transported without water even, provided the skin and gills are kept moist under low temperature. The cryopreservation of fish sperm for use at any convenient time can be referred to here, though this would concern seed production more directly than live seed transport.
On the topic of production of fish.consists of topics fisheries,aquaculture,types of fisheries and aquaculture and other topics .pls you should delete the last slide
MULTI HAZARD AND DISASTER VULNERABILITY OF IN DIAKartik Mondal
In relation to hazards and disasters, vulnerability is a concept that links the relationship that people have with their environment to social forces and institutions and the cultural values that sustain and contest them. It's also the extent to which changes could harm a system or to which a community can be affected by the impact of a hazard. A natural disaster is a consequence when a natural calamity affects humans and/or the built environment. Human vulnerability, and often a lack of appropriate emergency management, leads to financial, environmental, or human impact. The resulting loss depends on the capacity of the population to support or resist the disaster: their resilience. This understanding is concentrated in the formulation: "disasters occur when hazards meet vulnerability".
A SEMINAR ON INDUCING AGENTS OF HYPOPHYSATIONKartik Mondal
The precise combination of environmental factors required for maturation, ovulation and spawning.
However, quite often, under farm conditions, the requisite environmental factors are either not available or do not persist for sufficient length of time for spontaneous maturation to occur.
The pioneering discovery of B.A. Houssay (1931) and Von Ihering (1935, 1937, Argentina) that fishes can be induced to spawn by injecting pituitary homogenates has somewhat mitigated the problem.
The principal advantage of this technique, referred to in aquaculture parlance as “Hypophysation.”
Pre-stocking management of nursery pond for IMCKartik Mondal
Pre stocking management is one of the important method of entire three tire fish farming system. Because, fish mortality is very high at the stage of spawn. The stocking density of nursery pond is 2 lacks/ha.
In Nursery pond fish nursed very well to prevent fish mortality.
Hill areas offer good scope for the development- of fisheries—both for commercial and sport purposes.
The coldwater fishery resources in India comprise high and mid-altitude lakes, rivers, streams, their tributaries and reservoirs dammed across such rivers.
The importance of coldwater fisheries lies in their unique biodiversity, valuable germplasm and maintenance of environmental quality in hills.
Coldwater fishes breed naturally but since some species have been listed as endangered, therefore artificial breeding is now being practiced to restore the diversity.
The pomfrets constitute about 2.32% of the total marine fish production in India. The bulk of the catch comes from Maharashtra and Gujarat States, which jointly contribute to about 61% of the total all India pomfret landings.
Among the demersal fishes, pomfrets belonging to the family Stromateidae are found in the catches all long the coast of India, particularly in Maharashtra and Gujarat States.
Almost all natural bodies of water bear fish life, the exceptions being very hot thermal ponds and extremely salt-alkaline lakes such as the Dead Sea and Great Salt Lake. The fishes belong to the most numerous and diversified group among vertebrates. They dominate the water bodies of the world through a variety of morphological, physiological and behavioral adaptations. They have been in existence for more than 450 million years. A total of 24618 species of fishes belonging to 482 families and 4258 genera have so far been described. About 58% of the fish species are marine while 41% are freshwater inhabitants and 1% migrants. In our Indian region alone, there are 2,500 species of which 930 are inhabitants of freshwater and the rest live in the seas. In other words, India harbours 11.5% of the fish fauna so far known in the world. There are over 800 living species of sharks and rays, 30 species of chimaeras and ratfishes, 6 species of lung fishes, 1 species of coelacanths, 36 species of long ray finned bichirs, sturgeons and paddlefishes. The Neopterygii are the rest of the known species of modem fishes. All these fishes inhabit various niches in the aquatic environment. The diversified habitats of fishes include open oceans, deep oceanic trenches, nearshore waters, saline coastal embayments, brackishwaters, estuaries, intermittent streams, tiny desert springs, vernal pools, cold mountain streams, lakes, ponds, etc.
Fishing is the art of catching fish and other aquatic animals. Many years ago man started using various type of gear used for hunting the terrestrial animals and for fishing also. It is very difficult to say which started first, but some time it is opined that fishing is younger. Reason behind it is easy to catch animals in the land than in the water. In olden days fishing was not having much importance as there was no demand for fish. Earlier fishing was restricted to a particular community but it is not so now. In order to meet the increased demand, fishing is now carried out industrially. Fishing technology not only concerns fishing gear, fishing methods and vessels but also concern Biological and Environmental factors
DESIGN AND CONSTRUCTION OF SHRIMP HATCHERYKartik Mondal
Shrimp is a valuable aquatic food resources high In protein and command good export markets. The tiger shrimp P.indicus and p.merguiensis are important candidate or aquafarming.The seed requirement presently meet from the wild and insufficient to meet growing demand. Hence there is a good potential for hatchery production of shrimp seed.
The success of a shrimp hatchery depend on:
1.The choice of suitable site
2.Effectiveness and efficiency of the hatchery design
3.Experience of hatchery technicians
4.Efficiency of operational management.
Aquarium plant: Utility and propagationKartik Mondal
Being at the base of food chain, plants are important in any ecosystem. Plants help to provide the biological balance, besides creating bio-topic aquarium.
The presence of different aquatic plant provides a number of houses to the fishes inside the aquarium.
Most fresh water aquariums can be set up with live plants and whenever possible, it is recommended to do so.
The Roman Empire A Historical Colossus.pdfkaushalkr1407
The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
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
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.
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
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.
Overview on Edible Vaccine: Pros & Cons with Mechanism
Bheri farming: shore based aquaculture
1. 1
Bheri farming: shore based aquaculture
Introduction: Shorebased aquaculture or coastalbrackish water
aquaculture is practiced in many countries. There are various methods of
traditional culture systembased on the local conditions. Shrimp culture is the
main attraction of this culture system. Someother fishes and other organisms
like crabs, bivalves and seaweeds are also farmed. This type of culture system
is mainly found in south EastAsia.
BHERI
In this systemof culture, tidal water is impounded in the inter-tidal
mudflats by raising bounds. Tidal water with all assorted fish,
crustaceans and other organisms’ seed is allowed to through sluice-gates
during spring tides.
Harvesting of marketable sized fishes and other organisms is done
regularly during spring tides
through traps placed near the
sluice-gate.
There is no need of manuring
and feeding. The average
production of this type of
systemis about500-750 kg/ha.
“Bheri” may be defined as an
embanked water body with a
depth of 2-5 feet and area of about 200-250 acres.
They are generally a storing tank wherethe fishes are grown without
supplying any supplementary food.
In India, theseare best developed in the state of West Bengal, which
may classify into brackish water and fresh water categories.
2. 2
Bheri Culture:-
For Bheri culture, rice fields of 0.1 ha area may be economical. Normally four
rice plots of 250m²
(25 x10 m) each may be formed in such an area. In each
plot, a ditch of 0.75 m width and 0.5 m depth is dug. The dikes enclosing the
rice plots may be 0.3 m high and 0.3 m wideand are strengthened by
embedding straw. The ditches haveconnections with the main supply or drain
canal, on either side of which, the rice plots are located, through inlet-outlet
structures of the dikes. The depth and width of the supply or drain canal may
be slightly smaller than that of the ditches. Suitable bamboo pipes and screens
are placed in the inlet and outlet structures to avoid the entry of predatory fish
and the escape of fish under culture. The ditches servenot only as a refuge
when the fish are not foraging among rice plants, but also serveas capture
channels in which the fish collect when water level goes down.
The fish species which are cultured in the bheries.
The fish species which could be cultured in rice fields must be capable of
tolerating shallow water (15 cm), high temperatures (up to 35ºC), low
dissolved oxygen and high turbidity.
Species such as Catla catla, Labeo rohita, Cirrhina mrigala, Cyprinuscarpio,
Chanoschanos, Oreochromismossambicus, Anabastestudineus, Mugil
spp., Clariasbatrachus, etc.
Catla catla Cirrhinus mrigala
3. 3
NONA BHERI:
• Saline water bheries are broadly known as ‘Nona bheries’.
• These are sizes from 50 – 2000 bighas.
THREE CATEGORIS OF NONA BHERI:-
Nona Bheri Fish Farm.
Anabus testudineus
Oreocromis mossambica
Labeo rohita
4. 4
(Purely for fish culture)
Nona Bheri paddy-cum fish
culture.
(Fish is primarily produced)
Nona Bheri Fish-Cum Paddy
culture.
(Paddy is primarily Produced)
BRACKISH WATER BHERi:
Low saline water bheries are known as brackish water bheries.
A traditional brackish-water fish and prawn culture used in paddy fields
in India.
Fry enter the fields at high tide and are prevented from leaving by fine
mesh nets at the sluices.
Mullets (Mugilidae) and cichlids (Cichlidae) are harvested in December
after growth fromOctober when the rice was harvested and the fields
turned over to fish culture.
Types of Brackish-water Bheri:-
Perennial Brackish-water Bheri
Fish cum Paddy culture Bheri
Paddy cum Fish culture Bheri.
5. 5
Perennial Brackish-water Bheri:-
Suitable areas, near tidal rivers or channels of their beds, wereprotected
frombeing flushed out by monsoon or tidal floods by putting
embankments around them keeping water level of 5 ft.
FromMarch or April onwards during suitablefloods tides salt water was
entered into the embankment fromthe adjoining areas through sluice
gate, with the help of small and narrow canals.
The bamboo gratings are kept in frontof sluice gate to prevent the
fishes in the ponds fromescaping when the gates are opened.
Larvaeand Fry of fishes as L.calcarifer, M.parsia and other brackish-
water species entered into the protected areas.
The young one thus entrapped wereusually allowed to remain in these
closed areas for 8-10 months till they attained marketable size.
Large scale fishing operations are carried out between September and
November.
Water is let-out, the fishes moveinto the canals and deeper areas of the
ponds wherethis are caught by means of Drag Nets.
Cast nets are operated in this type of fishing purpose.
The catches are sometimes kept in the live wells or cages known as
“Hapar”.
HYDROBIOLOGICAL CHARACTERISTICS OF PERENNIAL
BRACKISH WATER BHERI
POND TOPOGRAPHY:-
6feet-9feet. Averagedepth during rainy season.
6. 6
METEOROLOGICAL OBSERVATION:-June-September, normalrainfall
24.43 - 36.5 cm
WATER CHARACTERISTICS:-Temperatureranged between 14.4°c-
35.0°c.
HYDROGEN-ION CONCENTRATION: - pH in between 7.9-8.3.
CHLORINITY: - 6.05-11.10%exceptduring July-September. The
averagerainfall during this season 1.80-2.20%.
PADDY-CUM FISH CULTURE
After initial drying of the Bheri,
water fromthe estuary is drawn
sometime between November
and December through sluice
gates and allowed to stabilize for
10-15 days to help in growing
algal matter.
Depth should be in between 0.3-
1 meter.
During tidal phasecertain volume
of water released earlier is drawn
back into the Bheri fromestuary.
During slack period water is lifted
into the Bheri through a pump.
Paddy seedlings are lifted during Augustand September when water
salinity is considerably low.
Major carp like catla of 70-100 gm size, prawn, and shrimp are stocked in
Bheri.
7. 7
Paddy harvesting is completed by November-December prior to this the
Bheri water is drained out to trap fishes, as by fish would grow 1.5-2 kg
in size.
FISH-CUM PADDY CULTURE
In this type of culture land are
well protected by embankment
on both the sides of the river,
channels, and creeks from free
in coming of highly saline
water.
All the lands are properly dyed
keeping the irrigation
embankment. The depressed area on one side of this Bheri is
again dyed.
The smaller Bheri is connected to the inlet and outlet sluice
gates constructed on the irrigation embankment.
By January, when salinity goes down to the minimum, sufficient
water drawn into the smaller Bheri through the inlet sluice
gates during spring tide.
With the onset of monsoon the salinity will decrease and after
a thorough plugging paddy seeds are planted during July.
The smaller bandhs of different plots of lands together with the
main embankment of the smaller Bheri are leveled and the
small fishes are allowed to move freely in the paddy field.
8. 8
Prior to paddy harvesting the Bheri water is let out and fishes
are trapped and removed.
By adopting this process 56.07 kg/ha paddy obtained and 56.07
kg/ha fish will obtain.
Advantages of Bheri culture:-
• Production of paddy as additional crop.
• Insects & pests that attack the paddy can be controlled by stocked fish
as fish take this organism as feed.
• Fecal material dischargefromfish body serveas fertilizer in the rice field
as a resultfertility of the field increases.
• More profitable.
• Easy technology & low cost involvement.
PROBLEMS AND LIMITATIONS:-
Poor water quality can impede growth and cause death.
Pesticide & other toxic chemicals can kill fish & should be kept
away from them.
Good water management is essential, but not always possible.
Summary
• Generally bheries are the storing tank where the fishes are
grown without supplying of any supplementary food. They are
protected by embankments through erecting artificial walls or
barriers where diluted sewage water is allowed to enter
through the sluice gate which provides nutrition for the
developing fishes.
9. 9
• Generally, there are two types of bheries such as saline water
bheries and brackish water bheries.
Conclusion
Fisheries are a sunrise sector with varied resources and
potentials. About all the inland resources for fish culture are
exploited.
So the only way to increase the fish production and to met the
increasing demand of portentous food in the world is the shore
based aquaculture and coastal aquaculture.
In shore based aquaculture system Bheri aquaculture is an
important one.
Many brackish water species like Bhetki, Parse, some Shrimp,
Prawn, and Crab are cultured in Bheri.
Economically it is also important because enough nutrients
are provided by the Bheri, so artificial feed are not required.
References:
1. Handbook of fisheries and aquaculture – ICAR- S.Ayyapan
2. www.google.com
3. www.wikipedia.com
THANK YOU..........