The seas around Britain are a wasteland compared with 100 years ago and at least a third of the sea must be closed to fishing if the profusion of fish we had then is to return, according to a new book.

"We have an ecosystem that has turned from the big turbot and halibut and the shoals of herring and cod of the 1880s, into prawns, scallops and mud," says the author, Callum Roberts, Professor of Marine Conservation at York University.

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