The Fukushima nuclear disaster following the tsunami in March 2011 was the largest accidental release of radioactive material into the ocean in history. Scientists are attempting to work out the impact of this. One startling finding has been the detection of radioactive elements in Pacific bluefin tuna off the coast of San Diego, California. The migratory tuna transported radioactive particles across the ocean in just 5 months, according to the study, published online today (May 28) in the Proceedings of the National Academy of Sciences.
The research paper is:
D. J. Madigan, et al., “Pacific bluefin tuna transport Fukushima-derived radionuclides from Japan to California,” PNAS, doi/10.1073/pnas.1204859109, 2012