Bycatch , in the fishing industry, is a fish or other marine species that is caught unintentionally while catching certain target species and target sizes of fish, crabs etc. The term bycatch is also sometimes used . Bufret Lignende Oversett denne siden Wherever there is fishing, there is bycatch —the incidental capture of non-target species such as dolphins, marine turtles and seabirds. Modern fishing gear, often undetectable by sight and extremely strong, is very efficient at catching the desired . Getting seafood to the dining table comes at an expense to endangered species that too often perish in the nets and on the hooks set for the fish and shellfish we eat. The incidental capture and mortality of non-target marine animals during fishing is known as bycatch , and is one of the principal threats to marine biodiversity .
Fishermen sometimes catch and discard animals they do not want, cannot sell, or are not allowed to keep. This is collectively known as bycatch. Bycatch can be a bigger problem for some fisheries than others.
Marine turtles arose in the oceans over 1million years ago, yet over the past 1years numbers have dropped dramatically. Hundreds of thousands of these ancient reptiles are caught each year as bycatch , especially on longlines, in shrimp trawlers, gill nets and purse-seine nets. The sea turtle population has now six of . Many Asian tropical shrimp trawl fisheries generate massive bycatch of trash fish – juvenile and small fish – that is often marketed.
This provides little incentive for fishers to implement the bycatch reduction devices that will allow these fish to escape.
Some policies actually create incentives to discard unwanted fish. Learn about bycatch , the incidental catch of unwanted species including other fish, turtles and seabirds, and its impact on ocean health. Many sea creatures are the helpless victims of bycatch.
They are caught in fishery operations and are usually. Some fishing techniques are worse than other for bycatch. Up to of the catch in tropical shrimp trawling is thrown away.
In the United States, despite strong management measures and conservation initiatives in some regions, bycatch remains a persistent problem for far too many fisheries. Oceana has identified nine fisheries that have some of the worst bycatch in the United States. These nine fisheries injure and kill thousands of protected and endangered species every year. Define bycatch : the portion of a commercial fishing catch that consists of marine animals caught unintentionally. Destructive fishing practices devastate the marine environment and include bottom trawling, bycatch , the use of poison and explosives and ghost fishing.
When fishing techniques have been universally recognized as destructive, the only solution is to ban them. Anyone continuing to use these techniques must be severely . Alverson et al for instance suggest, that in the Northwest Pacific of the shrimp bycatch is discarded producing over million tonnes of waste fish. It is further defined as anything that is caught and discarded at sea, including targeted fish that are discarded due to undesired quality or size, or anything that is caught and taken back to port but that was not the target of the fishing trip, that is, “nontarget . Scientists and the fishing industry have worked hard in recent years to develop methods that will prevent as much bycatch as possible.
Bycatch is any catch that is not the main objective of a fishing fleet.
These methods to stop or reduce bycatch depend on the type of fishing gear employe the animals in question and their behaviour.