How tuna conquered the world

We swallowed it in sandwiches. We scoffed it as sushi. Now it's swimming straight towards extinction. How did the global appetite for tuna become insatiable? Martin Hickman reports:

Celebrity chefs keep returning to a four-letter in their glossy recipe books: tuna. Gordon Ramsay offers sesame-encrusted tuna with watercress salad; Nigella Lawson knocks ups a time-saving tuna, crab and avocado wrap. Rick Stein? That'll be chargrilled tuna with salsa verde.

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