A Tokyo sushi restaurant displays blocks of fat meat tuna cut out from a 269kg bluefin tuna.
Yoshikazu Tsuno/AFP/Getty Images
May 29, 2012 The amount of radiation found in Pacific bluefin tuna spawned near Fukushima does not threaten our health, despite today's suggestive headlines. What a new study shows is that scientists can rely on tiny amounts of radiation to track animals across great distances.
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