Scientists in California said on Monday that bluefin tuna had been found to contain radioactivity, carried 6,000 miles from Japan where radioactivity leaked into the waters after its nuclear crisis. “We were frankly kind of startled,” said Nicholas Fisher, one of the researchers in the National Academy of Scientists who reported the findings. The levels of radioactive cesium were 10 times higher than the amount in tuna off the California coast in recent years, although the levels are still well below the safe-to-eat levels set by the U.S. and Japan.

The results "are unequivocal. Fukushima was the source," said Ken Buesseler of the Woods Hole Oceanographic Institution, who had no role in the research.

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