See this before eating any Tuna 
Every Bluefin tuna caught from California is radioactive
All the bluefin tunas tested off California waters showed contamination with harmful radiation from Fukushima disaster.
The Radioactive Tuna
Ever since the nuclear melt-through which occurred at Fukushima Daiichi plant in March, 2011, radioactive contaminants’ dumping flow in the ocean is still continuing nonstop. The fish coming at this stage are swimming with the contaminants every since their birth. All the blue fin tunas tested near the California waters have shown that they are contaminated with the radiation originated from Fukushima.
The side effects of contacting with the radioactive caesium:
With radioactive caesium contact occurring, a person might experience cell damage because of the radiation of caesium particles. By this, several effects like vomiting, diarrhea, nausea, and bleeding can occur. If the exposure lasts long, then people might even lose their consciousness, followed by a coma or even death.


The Researchers say:

The proof is “unequivocal” which says that the tuna caught near San Diego nearly a year ago wee found to be contaminated with the harmful radiation coming from Japan’s nuclear disaster.

In May, 2012, Wall Street Journal reported on study done by Stanford University (lead by marine ecologist named Daniel Madigan.) Madigan said that “the tuna packaged up the radiation and then brought it across world’s largest ocean. All of us were absolutely surprised to see it and even more so when we saw it in each one that we measured.”
Another study group member of the Stony Brook University- a marine biologist named Nicholas Fisher tells:
“We saw that totally each one of them contained similar quantities of cesium 137 as well as cesium 134.”