The west coast of Africa is an important area for migrating fish such as the Yellow Fin Tuna, going North to spawning sites. Whole schools are caught by waiting purse-seiner ships as they migrate. The purse-seiners use the latest technology to find the schools of fish and up to 2 kilometres of net 200m deep looped around in the shape of a circular purse with a drawstring beneath, which is tightened to stop anything within getting free, they are mostly Spanish owned. The by-catch comprises of sharks feeding on the Tuna, and turtles most commonly, whales can be caught up too. Fish, sharks and turtles that get caught in the nets are brought onboard, and once returned to the sea it is believed that up to 90% don't survive.
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