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In pictures: Japan's food crisis
Sustainable tuna?

The Japanese consume about 25% of the world's stocks of tuna.

The tuna themselves are such voracious eaters it takes around 4kg of small fish to produce 1kg of tuna, so some argue that consumers who want to make sustainable choices should avoid buying tuna.

A giant tuna can sell for the price of a small car, so the incentives for those involved in the trade to source fish caught illegally elsewhere are huge.

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