The destruction wrought on the world's oceans by industrial fishing is made clear in a shocking new report.

The analysis, published in the scientific journal Nature, suggests 90% of large predator fish have been cleared from the seas in the past 50 years.

The authors say the era of "heroic" fish - the truly huge swordfish, marlin and sharks that inspired legends and novels - is now well and truly over.

And other commercially important species, such as tuna, cod, halibut, skate and flounder are now generally far smaller in size compared with their ancestors.

The study has been written by Dr Ransom Myers and Dr Boris Worm of Dalhousie University in Halifax, Nova Scotia.

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