2048 Collapse for world sea fishing

This extract from the Economist:
"BORIS WORM, a marine biologist, has spent much of his academic life studying fish. In 2006 he came to the depressing conclusion that by 2048 the world’s commercial fisheries would have collapsed. Fish would no longer be on the menu. But Dr Worm is no pessimist and on July 31st he published a more encouraging piece of work in Science. It suggests that, with proper management, it ought to be possible to rebuild the world’s fisheries."