Page last updated at 22:47 GMT, Friday, 12 June 2009 23:47 UK

Could tuna disappear from the sea?

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There are warnings that tuna could start to disappear from the sea as early as 2012.

There are fears that the creatures, known as the "cheetahs of the ocean", could be driven to extinction by our growing appetite for sushi and omega-3 oils.

The BBC's Environment Correspondent, David Shukman, reports.

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