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More than 70 Chinese vessels have been found fishing illegally off the coast of West Africa, Greenpeace says.

Using information gathered from 2000 to 2014, Greenpeace said Chinese companies had fished in prohibited grounds or under-declared their catches. Boats either turned off their identification systems or transmitted false location data, it added. One company's fishing capacity off the coast of Guinea Bissau is said to have exceeded its authorised limit by 61%. The absence of efficient fisheries management in some West African states allows rogue companies to plunder marine resources, the BBC's Thomas Fessy reports from Dakar in Senegal.

In less than a month, Greenpeace documented an average of one new case of illegal practice by a Chinese-