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Demand for seafood and technological advances have led to fishing practices that have depleted bivalve fish and shellfish populations around the world. Each year, fishermen remove more than 77 billion kilos of wild animals from the sea. Scientists fear that continued fishing at this rate could soon lead to a collapse of the global fishery. To continue to rely on the ocean as an important source of food, economists and conservationists say we must apply sustainable fishing practices. Take the example of bluefin tuna. This fish is one of the largest and fastest on the planet. It is known for its delicious meat, often eaten raw, like sushi. The demand for this particular fish has led to very high market prices and threatened its population. In 1970, the bluefin tuna spawning population was estimated at between 21 and 29% of the population.

Since then, pretty much, commercial fishermen have been catching bluefin tuna with wallets and longlining. Sliding seine fishing uses a net to pull the fish out and then wrap them by pulling the cord from the net. The net can draw a lot of fish over a time, and is usually used to catch school fish or those that gather to spawn. Longlining is a type of fishing where a very long line – up to 100 kilometres – is pulled behind a boat. These lines have thousands of baited hooks attached to smaller lines that stretch down. Being a wallet and longlining are effective fishing methods. These techniques can catch hundreds or thousands of fish at the same time. Overfishing So many fish at the same time can lead to an immediate payment for fishermen. However, fishing in this way leaves only a few fish of a species in the ocean. If a fish stock is small, it cannot be filled simply by reproduction.

Overfishing is called overfishing to get wild animals out of the sea faster than populations can multiply. Wallets, longlining and many other types of fishing can also result in a quantity of bycatter, the capture of accidental species.