A study of the world's underwater eco-systems found that if overfishing and pollution continue amid climate change, then most species will decline to just 10 per cent of historic levels.
Cod, haddock, mackerel, salmon and tuna will virtually disappear, to be replaced by vast blooms of algae and plankton, some of which are toxic, worms and hordes of jellyfish.
Crustaceans, such as crabs and shrimps, may initially benefit, feeding on the dying, but will eventually succumb as they become the targets of fishing. Predators like seals, dolphins and sharks will also be at risk.
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