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Bluefin tuna: Japan's obsession with a US castoff

How did Japan get hooked on bluefin tuna? The BBC’s Edwin Lane speaks to author Trevor Corson, who explains how the wild fish went from being discarded at US town dumps to the pinnacle of Japanese cuisine - sushi.

(Picture: A chef preparing bluefin tuna sushi. Credit: Ethan Miller, Getty Images)

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4 minutes