‘The levels of radioactive cesium were 10 times higher than the amount measured in tuna off the California coast in previous years. But even so, that’s still far below safe-to-eat limits set by the US and Japanese governments.
Previously, smaller fish and plankton were found with elevated levels of radiation in Japanese waters after a magnitude-nine earthquake in March 2011 triggered a tsunami that badly damaged the Fukushima Dai-ichi reactors.’
The risk is posed by microscopic radioactive particles washed out of the reactor with the cooling water. These particles can be absorbed by plankton and other microscopic sea creatures. Tuna is carnivorous fish and can concentrate radioactivity by ingesting smaller fish. It is also a very fast-swimming fish and can reach the coast of USA within months.
Although the Government is dismissing the concerns, I think those consuming a lot of tuna should consider using other fish species, like sardines. Radioactive particles tend to accumulate further up the food chain, and humans are on top of it.