Nightly News | May 29, 2012
>>> this next item made a lot of u.s. consumers sit up and take notice today. bluefin tuna caught off the california coast have been found to contain elevated levels of radioactive matter dating back to the japanese earthquake and tsunami that led toed nuclear accident at the fukushima power plant . our report tonight from nbc's miguel almaguer.
>> reporter: today in southern california , don inspects the catch of the day, and stressed his fish are safe to eat.
>> the word radiation creates fear in people.
>> reporter: the 15 bluefin tuna caught and tested off california 's coast last summer, showed low levels of radiation, but still ten times higher than normal. scientists say it's the first time a fast moving migrating fish has been shown to carry radio activity from japanese waters.
>> we almost didn't believe it, to tell you the truth.
>> reporter: dr. nicholas fisher, co authored the study.
>> every single fish was significantly contaminated with two radioisotopes of cesium. these are common waste products from nuclear accidents .
>> reporter: the bluefin tuna that spawn and feed near the fukushima daiichi nuclear power plant travelled just a few months later. today the the fda said they'll continue to monitor radiation levels in fish, and no public health concern has been detected.
>> i i don't think i'll change the way i eat, not at the moment.
>> it's made me alter just a little bit, not eat quite so much.
>> reporter: massive in size, up to ten feet and weighing more than 1,000 pounds. pacific bluefin tuna is a delicacy, often eaten as sushi around the world. the real test on how radiation affects migrating fish could lead to higher levels of pollution.
>> that is a distinct possibility.
>> reporter: japanese officials will conduct more testing in their waters. this as researchers here do the same many miguel almaguer nbc news, san pedro , california .