Bluefin Tuna record Fukushima pollution

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Radioactivity from last year's Fukushima accident has been found in Pacific Bluefin tuna caught off the coast of California.

Scientists say the fish would have picked up the contamination while swimming in Japanese waters.

The radioactivity is well within safe limits, but researchers say the case illustrates how migratory species can carry such pollution over vast distances, as Jonathan Amos reports.

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