Many fisheries are non-selective fishing gear catching animals that they did not intend to. This non-taget extra catch is known as ‘bycatch’. • Of these bycatch species, some have a commercial value and are brought back to land by fishers to be sold. However, a large proportion is unwanted and so is discardedthrown back over the side of the boat.
FAO estimates: 7.3 million tonnes of fish is discarded every year
• Nearly 20 percent of shark species are threatened with extinction, primarily as a result of being caught accidentally on longlines. Bycatch also includes young fish that could rebuild populations if they were allowed to grow and breed.
Hundreds of thousands of sea turtles, seabirds and marine mammals, including whales, dolphins and porpoises, die as bycatch. As many as 200,000 loggerhead sea turtles and 50,000 leatherback sea turtles are caught annually. Longline fishing also kills hundreds of thousands of seabirds when they become entangled in drift nets or caught on longline hooks when they dive for bait.
This black-browed albatross has been hooked on a long-line.
Seabirds with longline fishing vessel
Not only fish:
By catch is the portion of the catch that is not comprised of the fishery’s target species . Species that are caught accidentally
Bycatch from a shrimp trawler
The FAO defines discards as the portion of the catch that is thrown back into the sea either dead or alive . Like marine mammals , crustaceans , and seabirds ,sharks, birds, turtles, corals ,etc.
Marine protected area Marine protected areas (MPA) are protected areas of seas, oceans, estuaries or in the US, the Great Lakes .[2] These marine areas can come in many forms ranging from wildlife refuges to research facilities.[3] MPAs restrict human activity for a conservation purpose, typically to protect natural or cultural resources.[4] Such marine resources are protected by local, state, territorial, native, regional, national, or international authorities and differ substantially among and between nations. This variation includes different limitations on development, fishing practices, fishing seasons and catch limits, moorings and bans on removing or disrupting marine life. In some situations (such as with the Phoenix Islands Protected Area), MPAs also provide revenue for countries, potentially equal to the income that they would have if they were to grant companies permissions to fish.[5]
On 28 October 2016 in Hobart, Australia, the Convention for the Conservation of Antarctic Marine Living Resources agreed to establish the first Antarctic and largest marine protected area in the world encompassing 1.55 million km2 (600,000 sq mi) in the Ross Sea.[6] Other large MPAs are in the Indian, Pacific, and Atlantic Oceans, in certain exclusive economic zones of Australia and overseas territories of France, the United Kingdom and the United States, with major (990,000 square kilometres (380,000 sq mi) or larger) new or expanded MPAs by these nations since 2012—such as Natural Park of the Coral Sea, Pacific Remote Islands Marine National Monument, Coral Sea Commonwealth Marine Reserve and South Georgia and the South Sandwich Islands Marine Protected Area. When counted with MPAs of all sizes from many other countries, as of August 2016 there are more than 13,650 MPAs, encompassing 2.07% of the world's oceans, with half of that area – encompassing 1.03% of the world's oceans – receiving complete "no-take" designation.[7]
lobsters and crab fisheries in INDIA is a vast and enormous amount of catch and exports are being made.
this slide describes about the methods, distribution, annual landings and important species of lobster and crabs in India.
Eco-Friendly Fishing Lures: One of the best ways to practice sustainable fishing is to use biodegradable fishing lures. Since rubber doesn’t break down, in the water or in a fish’s stomach, a good substitute is biodegradable plastic that will dissolve over time. An added perk to these eco-friendly options is that the soft lures can be made in all colors and designs to attract your target fish just as effectively as traditional lures.
Eco Fishing Weights: Not only is lead toxic to humans, but it’s dangerous for fish as well, causing both physical and behavioral changes. That’s why many manufacturers today produce sinkers made from safer materials that will cause less damage if ingested or left in the water. Some common substitutes used in non-toxic weights are brass, steel, tungsten or tin. You’ll also want to make sure they’re chip resistant to prevent paint loss in the water. And remember that while these variations may be a little more expensive than lead lures, the benefits outweigh the costs.
Eco Fishing Line: Like lures, anglers today can opt for biodegradable monofilament line fishing line that breaks down faster yet still has the same performance characteristics as regular line. Even if you don’t have biodegradable line, you can take steps to properly dispose of your traditional line to reduce your impact on the environment. For example, many bait shops, fishing access points, piers and other spots have designated collection bins for discarded monofilament and fluorocarbon fishing line.
Other Eco Fishing Tackle and Equipment: Anglers have several other eco-friendly options nowadays. For example, when you’re choosing hooks, opt for circle hooks instead of J-hooks to minimize internal damage if you’re practicing catch and release. Look for rigs made of materials like glass beads. Pick knotless nets. Instead of using fresh bait collected from fish habitats, choose artificial. And when you’re picking out other gear like waders, bags or boxes, look for those made from recycled materials.
ECO-FRIENDLY ANGLING
Beyond fishing gear, there are other ways to practice eco-friendly fishing. If you catch and release, in addition to choosing barbless circle hooks, be sure to use the right eco-friendly fishing lures for the species to avoid exhausting the fish, keep your catch wet and limit the time the fish stays out of the water to increase the chance of survival.
It’s also important to pay attention to the area around you. Take your trash with you to prevent fish and other wildlife from eating or getting caught in your rubbish. If you’re boating, consider rowing or paddling a canoe rather than a motorized choice. If you do go in a power boat, be careful when you’re navigating over fragile habitats and be careful to prevent fuel spills.
Marine protected area Marine protected areas (MPA) are protected areas of seas, oceans, estuaries or in the US, the Great Lakes .[2] These marine areas can come in many forms ranging from wildlife refuges to research facilities.[3] MPAs restrict human activity for a conservation purpose, typically to protect natural or cultural resources.[4] Such marine resources are protected by local, state, territorial, native, regional, national, or international authorities and differ substantially among and between nations. This variation includes different limitations on development, fishing practices, fishing seasons and catch limits, moorings and bans on removing or disrupting marine life. In some situations (such as with the Phoenix Islands Protected Area), MPAs also provide revenue for countries, potentially equal to the income that they would have if they were to grant companies permissions to fish.[5]
On 28 October 2016 in Hobart, Australia, the Convention for the Conservation of Antarctic Marine Living Resources agreed to establish the first Antarctic and largest marine protected area in the world encompassing 1.55 million km2 (600,000 sq mi) in the Ross Sea.[6] Other large MPAs are in the Indian, Pacific, and Atlantic Oceans, in certain exclusive economic zones of Australia and overseas territories of France, the United Kingdom and the United States, with major (990,000 square kilometres (380,000 sq mi) or larger) new or expanded MPAs by these nations since 2012—such as Natural Park of the Coral Sea, Pacific Remote Islands Marine National Monument, Coral Sea Commonwealth Marine Reserve and South Georgia and the South Sandwich Islands Marine Protected Area. When counted with MPAs of all sizes from many other countries, as of August 2016 there are more than 13,650 MPAs, encompassing 2.07% of the world's oceans, with half of that area – encompassing 1.03% of the world's oceans – receiving complete "no-take" designation.[7]
lobsters and crab fisheries in INDIA is a vast and enormous amount of catch and exports are being made.
this slide describes about the methods, distribution, annual landings and important species of lobster and crabs in India.
Eco-Friendly Fishing Lures: One of the best ways to practice sustainable fishing is to use biodegradable fishing lures. Since rubber doesn’t break down, in the water or in a fish’s stomach, a good substitute is biodegradable plastic that will dissolve over time. An added perk to these eco-friendly options is that the soft lures can be made in all colors and designs to attract your target fish just as effectively as traditional lures.
Eco Fishing Weights: Not only is lead toxic to humans, but it’s dangerous for fish as well, causing both physical and behavioral changes. That’s why many manufacturers today produce sinkers made from safer materials that will cause less damage if ingested or left in the water. Some common substitutes used in non-toxic weights are brass, steel, tungsten or tin. You’ll also want to make sure they’re chip resistant to prevent paint loss in the water. And remember that while these variations may be a little more expensive than lead lures, the benefits outweigh the costs.
Eco Fishing Line: Like lures, anglers today can opt for biodegradable monofilament line fishing line that breaks down faster yet still has the same performance characteristics as regular line. Even if you don’t have biodegradable line, you can take steps to properly dispose of your traditional line to reduce your impact on the environment. For example, many bait shops, fishing access points, piers and other spots have designated collection bins for discarded monofilament and fluorocarbon fishing line.
Other Eco Fishing Tackle and Equipment: Anglers have several other eco-friendly options nowadays. For example, when you’re choosing hooks, opt for circle hooks instead of J-hooks to minimize internal damage if you’re practicing catch and release. Look for rigs made of materials like glass beads. Pick knotless nets. Instead of using fresh bait collected from fish habitats, choose artificial. And when you’re picking out other gear like waders, bags or boxes, look for those made from recycled materials.
ECO-FRIENDLY ANGLING
Beyond fishing gear, there are other ways to practice eco-friendly fishing. If you catch and release, in addition to choosing barbless circle hooks, be sure to use the right eco-friendly fishing lures for the species to avoid exhausting the fish, keep your catch wet and limit the time the fish stays out of the water to increase the chance of survival.
It’s also important to pay attention to the area around you. Take your trash with you to prevent fish and other wildlife from eating or getting caught in your rubbish. If you’re boating, consider rowing or paddling a canoe rather than a motorized choice. If you do go in a power boat, be careful when you’re navigating over fragile habitats and be careful to prevent fuel spills.
Traps are fishing devices into which fish or shellfish are enticed by bait or shelter spaces or enclosures where they are guided to enter, because of an obstacle placed in their normal migration path and from which their escape is made difficult by constriction, retarding valves or labyrinths.
Trap fishing is a passive fishing technique of ancient origin. There is extraordinary variety in their design, fabrication and operation.
SYSTEMATIC POSITION of clams
What is the difference between mussels, oysters, scallops and clams?
General characteristics of clams
Distribution and habitat of clams
BIOLOGY of clams
Breeding habit of clams
Present status of production
Craft and gear
Clams have two symmetrical shells(Bivalve)
They can filters their food
Clams can control their outer shells and shut them in response to stimuli, via a elastic ligament and two large muscles
In side their usually grey, black shells you can see a white, tan center
Clams have siphons that forces water out and allows them to take in micro organisms
There are over 150 edible species.There are over 15,000 species of clams.Small freshwater clams fertilize eggs in a pouch and bear their young until its shell develops.
The Giant clam can weigh more than 400lb and live for over 150 years.
It takes 3-4 years for a clam to mature to market size.
Some clams can produce pearls.One in 5,000 clams forms a pearl.
A clam can live until about 35 years if not eaten.
distribution:
Marine clams are abundant in the low and mid intertidal zone in temperate seas globally. Other species of marine mussel live in tropical intertidal areas, but not in the same huge numbers as in temperate zones.
Certain species of marine clams prefer salt marshes or quiet bays, while others thrive in pounding surf, completely covering wave-washed rocks. Some species have colonized abyssal depths near hydrothermal vents. The South African white mussel exceptionally doesn't bind itself to rocks but burrows into sandy beaches extending two tubes above the sand surface for ingestion of food and water and exhausting wastes.
Freshwater clams inhabit permanent lakes, rivers, canals and streams throughout the world except in the polar regions. They require a constant source of cool, clean water. They prefer water with a substantial mineral content, using calcium carbonate to build their shells.
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.
CAGE CULTURE OF FISH THEIR TREND,STATUS AND PRODUCTION Ashish sahu
Cage culture is an aquaculture production system where fish are held in Cage. Cage culture of fish utilizes existing water resources but encloses the fish in a cage which allows water to pass freely through the enclosures and the surrounding water body. Cages are used to culture several types of shell fish and finfish species in fresh, brackish and marine waters. Cages in freshwaters are used for food fish culture and for fry to fingerling rearing.
In 1950s modern cage culture began with the initiation of production of synthetic materials for cage construction. Fish production in cages became highly popular among the small or limited resource farmers who are looking for alternatives to traditional agricultural crops. The mesh size of the cage is kept smaller than the fish body. In India cage culture have been attempted first for Air breathing fish. Cage mesh netting made from synthetic material that can resist decomposition in water for a long period of time. Cage are used to culture several type of shell fish and fin fishes in fresh , brackish and marine water. Cage in fresh water are used for food fish culture and for fry to fingerling rearing. Cages are generally small, ranging in freshwater reservoirs from 1 square meter (m2) to 500 m2.
Definition –
Cage culture is a system in which the cultured Fish 0r animal are enclosed from all side allowing water to pass freely through the enclosures and the surrounding water body.
HISTORY-
Cage culture seem to have developed around 200 year ago in Cambodia where fisherman used to keep clarias spp. And some other fishes in bamboo made cage. Cage culture is traditional in part of Indonesia also attempted for the first time in air breathing fishes in swamp for raising major carp in running water in the river, Yamuna and Ganga at Allahabad and for raising Common carp , Catla , Silver carp, Rohu , Snakehead and Tilapia in still water body of Karnataka. In India sea cage start in 2007 for culture sea bass at Vishakhapatnam by CMFRI. anchored in streams which are practically open sewers. Common carp , where cage are in the southern USA. Around 80 species are being culture in cage. In India cage culture was initially culture in bamboo cage is practice in west java, since early 1940. Modern cage culture in open water bodies probably originated in Japan in early 1950. According to FAO cage culture is being practiced in more than 62 countries and has a become high tech business in developed countries such as floating and submerged cage culture of Salmonids in Norway, Canada and Scotland, Tuna and Yellowtails in Japan , Chinese carp in China, and catfish.
Trawl nets and bottom seines possess an initial selectiveness owing to their particular design and mode of operation. A mesh size limitation would vary considerably in effect from one type of trawl net to another. It is important therefore to consider gear selectivity and performance before we begin to think of mesh sizes and their effect.
Take a herring vinge trawl for example and two other bottom other trawls like the granton trawl and the shrimp trawl. All use otter boards, all are on the sea bed throughout the duration of the tow and all have the same basic structure of wings, square, bellies, bag and cod end. But their performances differ as much as those of a racing car, a truck and a tractor. All three nets could be fishing in the same area, yet the vinge trawl might take only herring, the granton trawl only demersal fish and the shrimp trawl primarily shrimp or prawn. Mesh size has little to do with this species selection. It is a function of other aspects of gear performance - speed of tow, headline height, ground contact, flow of water through the body of the net, otter door spread, length of ground-cables, and so on. The vinge trawl would have the smallest mesh in the cod end, yet it would take no cod, haddock or shrimp. The shrimp or prawn trawl would have a smaller mesh than the granton trawl yet it would capture only a small proportion of the bigger fish the granton trawl would take. To imagine that in these cases the size of mesh controls the size of fish caught would be as simplistic as to think that the respective speeds of the racing car, truck and tractor were determined by the size of their wheels.
In contrast to the trawls designed to capture one species or group of species, there are the multi-species trawls or combination trawls which take a great variety of fish. The North Sea prawn and fish trawl is a combination net designed to capture Nephrops norvegicus or Norway prawns, plus demersal fish like cod, haddock, skate, monks, plaice and lemon sole. Most bottom trawls in the tropics and sub-tropics are multi-species trawls taking fish which vary greatly from each other in size and shape. There is no common selectivity factor and no common minimum size or length for the various species. For these fisheries, a mesh regulation is at best an inadequate means of reducing juvenile mortality. It can be aimed only at the smallest of the main commercial species.
2014-2015
Overview :
Many fisheries are non-selective fishing gear catching animals that they did not intend to. This non-taget extra catch is known as ‘bycatch’.
Of these bycatch species, some have a commercial value and are brought back to land by fishers to be sold. However, a large proportion is unwanted and so is discarded-thrown back over the side of the boat.
The mean of bycatch & discards
environmental & social Impacts
Some strategies & solutions
Some bycatch reduction devises in shrimp trawls :
TEDs
JTEDs
RES
Square mesh codends
Fisheyes
Square mesh window
Relation between effort & bycatch
Effects of cod-end mesh size on the catch discarded
characteristics of mixed stock FisheriesAshish sahu
ne of the key challenges to effective management of mixed-stock fisheries is estimation of the relative contribution of each stock to the harvest. Stock composition analysis uses either mark-recapture techniques or differences in the frequency distributions of population characteristics among stocks to estimate the composition of a mixture of stocks.
A fish aggregating device is a man-made object used to attract ocean going pelagic fish such as marlin, tuna and mahi-mahi. They usually consist of buoys or floats tethered to the ocean floor with concrete blocks. FADs attract fish for numerous reasons that vary by species.
Fisheries aggregating devices (FADs) are human-made structures anchored offshore that attract fish, making them easier to catch so you can have a great fishing experience.
Ideally, the role of data collection is to support the monitoring of stated objectives and support for management processes. States should ensure that timely, complete, and reliable statistics on catch and fishing efforts are collected and maintained in accordance with applicable international standards and practices and in sufficient detail to allow sound statistical analysis. Such data should be updated regularly and verified through an appropriate system.
Increasing demand for fish has increased the pressure on marine life. Pollution in the water bodies has intensified and threat to aquatic biota has become worse.
Traps are fishing devices into which fish or shellfish are enticed by bait or shelter spaces or enclosures where they are guided to enter, because of an obstacle placed in their normal migration path and from which their escape is made difficult by constriction, retarding valves or labyrinths.
Trap fishing is a passive fishing technique of ancient origin. There is extraordinary variety in their design, fabrication and operation.
SYSTEMATIC POSITION of clams
What is the difference between mussels, oysters, scallops and clams?
General characteristics of clams
Distribution and habitat of clams
BIOLOGY of clams
Breeding habit of clams
Present status of production
Craft and gear
Clams have two symmetrical shells(Bivalve)
They can filters their food
Clams can control their outer shells and shut them in response to stimuli, via a elastic ligament and two large muscles
In side their usually grey, black shells you can see a white, tan center
Clams have siphons that forces water out and allows them to take in micro organisms
There are over 150 edible species.There are over 15,000 species of clams.Small freshwater clams fertilize eggs in a pouch and bear their young until its shell develops.
The Giant clam can weigh more than 400lb and live for over 150 years.
It takes 3-4 years for a clam to mature to market size.
Some clams can produce pearls.One in 5,000 clams forms a pearl.
A clam can live until about 35 years if not eaten.
distribution:
Marine clams are abundant in the low and mid intertidal zone in temperate seas globally. Other species of marine mussel live in tropical intertidal areas, but not in the same huge numbers as in temperate zones.
Certain species of marine clams prefer salt marshes or quiet bays, while others thrive in pounding surf, completely covering wave-washed rocks. Some species have colonized abyssal depths near hydrothermal vents. The South African white mussel exceptionally doesn't bind itself to rocks but burrows into sandy beaches extending two tubes above the sand surface for ingestion of food and water and exhausting wastes.
Freshwater clams inhabit permanent lakes, rivers, canals and streams throughout the world except in the polar regions. They require a constant source of cool, clean water. They prefer water with a substantial mineral content, using calcium carbonate to build their shells.
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.
CAGE CULTURE OF FISH THEIR TREND,STATUS AND PRODUCTION Ashish sahu
Cage culture is an aquaculture production system where fish are held in Cage. Cage culture of fish utilizes existing water resources but encloses the fish in a cage which allows water to pass freely through the enclosures and the surrounding water body. Cages are used to culture several types of shell fish and finfish species in fresh, brackish and marine waters. Cages in freshwaters are used for food fish culture and for fry to fingerling rearing.
In 1950s modern cage culture began with the initiation of production of synthetic materials for cage construction. Fish production in cages became highly popular among the small or limited resource farmers who are looking for alternatives to traditional agricultural crops. The mesh size of the cage is kept smaller than the fish body. In India cage culture have been attempted first for Air breathing fish. Cage mesh netting made from synthetic material that can resist decomposition in water for a long period of time. Cage are used to culture several type of shell fish and fin fishes in fresh , brackish and marine water. Cage in fresh water are used for food fish culture and for fry to fingerling rearing. Cages are generally small, ranging in freshwater reservoirs from 1 square meter (m2) to 500 m2.
Definition –
Cage culture is a system in which the cultured Fish 0r animal are enclosed from all side allowing water to pass freely through the enclosures and the surrounding water body.
HISTORY-
Cage culture seem to have developed around 200 year ago in Cambodia where fisherman used to keep clarias spp. And some other fishes in bamboo made cage. Cage culture is traditional in part of Indonesia also attempted for the first time in air breathing fishes in swamp for raising major carp in running water in the river, Yamuna and Ganga at Allahabad and for raising Common carp , Catla , Silver carp, Rohu , Snakehead and Tilapia in still water body of Karnataka. In India sea cage start in 2007 for culture sea bass at Vishakhapatnam by CMFRI. anchored in streams which are practically open sewers. Common carp , where cage are in the southern USA. Around 80 species are being culture in cage. In India cage culture was initially culture in bamboo cage is practice in west java, since early 1940. Modern cage culture in open water bodies probably originated in Japan in early 1950. According to FAO cage culture is being practiced in more than 62 countries and has a become high tech business in developed countries such as floating and submerged cage culture of Salmonids in Norway, Canada and Scotland, Tuna and Yellowtails in Japan , Chinese carp in China, and catfish.
Trawl nets and bottom seines possess an initial selectiveness owing to their particular design and mode of operation. A mesh size limitation would vary considerably in effect from one type of trawl net to another. It is important therefore to consider gear selectivity and performance before we begin to think of mesh sizes and their effect.
Take a herring vinge trawl for example and two other bottom other trawls like the granton trawl and the shrimp trawl. All use otter boards, all are on the sea bed throughout the duration of the tow and all have the same basic structure of wings, square, bellies, bag and cod end. But their performances differ as much as those of a racing car, a truck and a tractor. All three nets could be fishing in the same area, yet the vinge trawl might take only herring, the granton trawl only demersal fish and the shrimp trawl primarily shrimp or prawn. Mesh size has little to do with this species selection. It is a function of other aspects of gear performance - speed of tow, headline height, ground contact, flow of water through the body of the net, otter door spread, length of ground-cables, and so on. The vinge trawl would have the smallest mesh in the cod end, yet it would take no cod, haddock or shrimp. The shrimp or prawn trawl would have a smaller mesh than the granton trawl yet it would capture only a small proportion of the bigger fish the granton trawl would take. To imagine that in these cases the size of mesh controls the size of fish caught would be as simplistic as to think that the respective speeds of the racing car, truck and tractor were determined by the size of their wheels.
In contrast to the trawls designed to capture one species or group of species, there are the multi-species trawls or combination trawls which take a great variety of fish. The North Sea prawn and fish trawl is a combination net designed to capture Nephrops norvegicus or Norway prawns, plus demersal fish like cod, haddock, skate, monks, plaice and lemon sole. Most bottom trawls in the tropics and sub-tropics are multi-species trawls taking fish which vary greatly from each other in size and shape. There is no common selectivity factor and no common minimum size or length for the various species. For these fisheries, a mesh regulation is at best an inadequate means of reducing juvenile mortality. It can be aimed only at the smallest of the main commercial species.
2014-2015
Overview :
Many fisheries are non-selective fishing gear catching animals that they did not intend to. This non-taget extra catch is known as ‘bycatch’.
Of these bycatch species, some have a commercial value and are brought back to land by fishers to be sold. However, a large proportion is unwanted and so is discarded-thrown back over the side of the boat.
The mean of bycatch & discards
environmental & social Impacts
Some strategies & solutions
Some bycatch reduction devises in shrimp trawls :
TEDs
JTEDs
RES
Square mesh codends
Fisheyes
Square mesh window
Relation between effort & bycatch
Effects of cod-end mesh size on the catch discarded
characteristics of mixed stock FisheriesAshish sahu
ne of the key challenges to effective management of mixed-stock fisheries is estimation of the relative contribution of each stock to the harvest. Stock composition analysis uses either mark-recapture techniques or differences in the frequency distributions of population characteristics among stocks to estimate the composition of a mixture of stocks.
A fish aggregating device is a man-made object used to attract ocean going pelagic fish such as marlin, tuna and mahi-mahi. They usually consist of buoys or floats tethered to the ocean floor with concrete blocks. FADs attract fish for numerous reasons that vary by species.
Fisheries aggregating devices (FADs) are human-made structures anchored offshore that attract fish, making them easier to catch so you can have a great fishing experience.
Ideally, the role of data collection is to support the monitoring of stated objectives and support for management processes. States should ensure that timely, complete, and reliable statistics on catch and fishing efforts are collected and maintained in accordance with applicable international standards and practices and in sufficient detail to allow sound statistical analysis. Such data should be updated regularly and verified through an appropriate system.
Increasing demand for fish has increased the pressure on marine life. Pollution in the water bodies has intensified and threat to aquatic biota has become worse.
Whale Shark The largest of all sharks and the largest living fish, the whale shark is one of the most dramatic views of the ocean. Its large size, distinctive patterns and its enormous mouth make it instantly recognizable and can be commonly seen wandering near the surface in tropical and subtropical waters around the world. Their diet is based mainly on plankton, but also regularly feed on small schooling fish and squid. Unlike basking sharks, which simply filter vast amounts of water as they swim, whale sharks actively suck their prey before filtering efficiently and are sometimes seen in groups, feeding on high concentrations of food. Regularly appear in the same places at specific times of the year, probably to capitalize on plankton blooms and events such as coral spawning.
Marine fisheries regulation act (mfra), and its amendments of gujrat and dama...Ashish sahu
Marine Fisheries Regulation Act
An Act to provide for the regulation of fishing by fishing vessels in the sea along the coast line of the State. (1) This Act may be called the Kerala Marine Fishing Regulation Act, 1980. (2) It extends to the whole of the State of Kerala.
Ocean acidification is the ongoing decrease in the pH value of the Earth's oceans, caused by the uptake of carbon dioxide (CO 2) from the atmosphere. ... When carbon dioxide dissolves into seawater, it forms carbonic acid (H2CO3). Ocean acidification impacts many species, especially organisms like oysters and corals.
Ocean acidification reduces the amount of carbonate, a key building block in seawater. This makes it more difficult for marine organisms, such as coral and some plankton, to form their shells and skeletons, and existing shells may begin to dissolve. ... The impacts of ocean acidification are not uniform across all species.
Mangroves and their importance with Threats iucn pptAshish sahu
A mangrove is a shrub or tree that grows in coastal saline or brackish water. ... Mangroves are salt-tolerant trees, also called halophytes, and are adapted to live in harsh coastal conditions. They contain a complex salt filtration system and a complex root system to cope with saltwater immersion and wave action.
Mangroves are defined as assemblages of salt tolerant trees and shrubs that grow in the intertidal regions of the tropical and subtropical coastlines. They grow luxuriantly in the places where freshwater mixes with seawater and where sediment is composed of accumulated deposits of mud.
Fisheries crime and their sollution pptAshish sahu
What is fisheries crime?: Fisheries crime is an ill-defined legal concept referring to a range of illegal activities in the fisheries sector. These activities – frequently transnational and organized in nature – include illegal fishing, document fraud, drug trafficking, and money laundering.
Illegal fishing is a key driver of global overfishing, it threatens marine ecosystems, puts food security and regional stability at risk, and is linked to major human rights violations and even organized crime.
Iconic species are socially, culturally and economically important, and the community expects them to be effectively managed and protected.
What is a flagship species? A flagship species is a species selected to act as an ambassador, icon or symbol for a defined habitat, issue, campaign or environmental cause. ... Flagship species are usually relatively large, and considered to be 'charismatic' in western cultures.
Collection device of fish eggs and larvae pdfAshish sahu
First, an incision is made in her abdomen and then a small tube is inserted. The farmer then puts his mouth on the tube and sucks out a sWhen the internal ovaries or egg masses of fish and certain marine animals are ripe for spawning they are called roe.mall quantity of eggs for examination. If they're the right color and consistency, he'll kill the animal and harvest the caviar.When the internal ovaries or egg masses of fish and certain marine animals are ripe for spawning they are called roe. I think the best way is to use a toothpick and place them on something flat like a small chunk of marble or any flat ornament. Then place in a submerged container. Don't let the eggs hit open air. Well, the eggs in my breeding tank hatched, but overnight the fry either escaped or died
Mollusca of India and need for conservationAshish sahu
Mollusca is the second-largest phylum of invertebrate animals after the Arthropoda. The members are known as molluscs or mollusks. Around 85,000 extant species of molluscs are recognized. The number of fossil species is estimated between 60,000 and 100,000 additional species
Goodbye, Gillnets Belize bans deadly fishing gear, protecting countless marine animals Magazine Opting Out Amazon packages are awash in plastic, and shoppers want alternatives Q&A with Sam Waterston On cod, climate change, and his ... Ocean Council Susan Rockefeller, Founder Kelly Hallman, Vice Chair Dede McMahon, Vice Chair Anonymous Samantha Bass Violaine and John Bernbach Rick Burnes Vin Cipol
A coral reef is an underwater ecosystem characterized by reef-building corals. Reefs are formed of colonies of coral polyps held together by calcium carbonate. Most coral reefs are built from stony corals, whose polyps cluster in groups.
Acharya Narendra Deva University of Agriculture and Technology is a university located in Kumarganj, Faizabad, Uttar Pradesh, India, established in 1975. It is named after the politician and educator Narendra Deva, who served as vice chancellor of the University of Lucknow and Banaras Hindu University. It also has constituent colleges in Ambedkar Nagar district and Azamgarh district, as well as a planned college in Gonda district.
Acharya Narendra Deva University of Agriculture and TechnologyAshish sahu
Acharya Narendra Deva University of Agriculture and Technology
Acharya Narendra Deva University of Agriculture and Technology is a university located in Kumarganj, Faizabad, Uttar Pradesh, India, established in 1975. It is named after the politician and educator Narendra Deva, who served as vice chancellor of the University of Lucknow and Banaras Hindu University. It also has constituent colleges in Ambedkar Nagar district and Azamgarh district, as well as a planned college in Gonda district.
Impact of climate change in atmosphere of oceanAshish sahu
How does climate change effect the ocean?
5 ways that climate change affects the ocean
Higher temperatures are bad for fish — and for us.
Polar ice is melting.
Rising sea levels represent a slow, seemingly unstoppable threat.
Warming oceans alter currents.
Climate change is affecting the chemistry of seawater.
Three main methods for pond management are adding aeration, water treatments like beneficial bacteria, and weed and algae controls. The single best water management strategy you can implement is adding pond aeration.
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 Create Map Views in the Odoo 17 ERPCeline George
The map views are useful for providing a geographical representation of data. They allow users to visualize and analyze the data in a more intuitive manner.
Welcome to TechSoup New Member Orientation and Q&A (May 2024).pdfTechSoup
In this webinar you will learn how your organization can access TechSoup's wide variety of product discount and donation programs. From hardware to software, we'll give you a tour of the tools available to help your nonprofit with productivity, collaboration, financial management, donor tracking, security, and more.
Model Attribute Check Company Auto PropertyCeline George
In Odoo, the multi-company feature allows you to manage multiple companies within a single Odoo database instance. Each company can have its own configurations while still sharing common resources such as products, customers, and suppliers.
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.
2. Kerala university of fisheries
& ocean studies, kochi
Presented by,
Ashish sahu
Responsible Fisheries
FRM
Instructor,
Dr. M. K. Sanjeevan
3. What is bycatch ?
Bycatch Includes all non-target animals
and non-living material which are caught
during fishing.
Bycatch is the portion of the catch that is
not comprised of the fishery’s target species .
Species that are caught accidentally.
Bycatch from a shrimp
trawler
4. Nearly 20 percent of shark species are threatened with extinction, primarily
as a result of being caught accidentally on longlines.
Bycatch also includes young fish that could rebuild populations if they were
allowed to grow and breed.
FAO estimates: 7.3 million tonnes of fish is discarded every year.
“Bycatch from shrimp trawling
usually consists of many fish
species and occasionally large
animals”.
5. Not only fish
Hundreds of thousands of sea turtles,
seabirds and marine mammals, including
whales, dolphins and porpoises, die as bycatch.
6. 200,000 loggerhead sea turtles and 50,000 leatherback sea turtles are caught
annually.
Longline fishing also kills hundreds of thousands of seabirds when they
become entangled in drift nets or caught on longline hooks when they dive for
bait.
7. Cause of bycatch
Bycatch occurs because modern fishing gear is very efficient, often covers an extensive area, and can be
highly unselective—it catches not only the target species but many other marine animals as well.
Poor fisheries management in certain countries further contributes to the problem.
Ignores regulations on net mesh sizes, quotas, permitted fishing areas.
Fishing gear is largely non-selective—any species can be caught, including non-target species.
Longlines, trawling and the use of gillnets are the fishing methods that most commonly result in
bycatch.
Longlining is a commercial fishing method commonly targeting swordfish, tuna and halibut, where
hundreds or thousands of baited hooks hang at intervals along a single fishing line.
The hooks (commonly called “J hooks”) cause problems for marine turtles when swallowed, usually
resulting in death.
Sharks, non-target billfishes and juvenile tunas are often hooked as well.
8. With trawling, boats drag large nets along the seabed, catching almost everything in their path.
They can damage coral reefs and at shallow depths, catch marine turtles.
Bycatch occurs because the nets also trap everything larger than the net’s mesh, which includes
juvenile fish, sharks, seabirds, marine turtles and cetaceans (whales, dolphins, porpoises).
Gillnets that are lost at sea are rarely recovered and can continue to capture marine animals for
many years.(Ghost fishing ).
9.
10.
11. What is discards ?
The FAO defines discards as the portion of
the catch that is thrown back into the sea
either dead or alive .
Like marine mammals , crustaceans , and
seabirds ,sharks, birds, turtles, corals ,etc.
12. Target species Valuable bycatch
• Non valuable species
• Over quota species
• Undersized individuals
Catch
Discard
Market
13.
14. Solution of control bycatch:
Use and development of species selective gear.
Monitoring and control of fishing gears
Motivating Technical conservation measures to improve gear selectivity.
The use of closed areas or protected areas to protect juvenile and spawning fish.
Fisheries management & marketing strategies
State’s laws for prohibiting discards & over grading.
Use by catch reduction devices.
Using mesh sizes big enough to allow some small animals to escape
Using TEDs and BRDs.
15. The first steps toward reducing bycatch is to identify the type of bycatch to be
excluded
Small species Large species Large animals
By Catch Identification
JTED
Square – mesh
cod end
Square – mesh
window Fish BoxFish eye
RES TED
16. 1. Ted ( Turtle excluder Device):
Used to exclude turtles and
other large animals from the
trawl
17.
18. WHAT WWF IS DOING?
WWF works with partners to introduce “circle” hooks.
These hooks are far less likely to be swallowed by turtles than J-
shaped hooks, which cause suffocation or internal bleeding when
ingested.
Working with the Inter-American Tropical Tuna Commission
(IATTC) and other partners, we introduced the hook in eastern
Pacific longline fisheries.
As a result, marine turtle deaths may be reduced by as much as
90 percent without adversely affecting catches of swordfish and
tuna.
“Here a green turtle that was
accidentally caught in fishing gear is
about to be returned to the wild by
WWF staff.”
World Wide Fund
Charitable trust
Purpose: Environmentalism
Conservation Ecology
Headquarters: Switzerland
19. INSPIRING INNOVATION OPERATED BY WWF :
Bycatch mortalities can often be reduced by modifying fishing gear so that
fewer non-target species are caught or so that non-target species can escape.
WWF created the International Smart Gear Competition to promote the
development of such innovative technology.
WWF offers more than $50,000 in prize money to attract new ideas that
may prove to be a valuable solution to some of the most pressing bycatch
problems in fisheries around the globe.
Winning entries have resulted in effective solutions to prevent bycatch of
marine turtles and seabirds and have even been implemented by the
recreational fishing industry