Toxins Through the FOod CHain
Radiation in the ocean doesn't just affect organisms living there. From the Fukushima disaster, "the toxic substances were identified as Tritium, Cesium and Strontium, being carried far and wide by winds, rain and ocean currents, entering the food chain through seaweed and seafood, building up high levels of toxicity in the fish – and humans – at the top end of the consumption chain." (#1) However, the FDA has stated that the radioactive leak from Fukushima hasn't reached US coastlines yet, meaning that there is no immediate concern for toxins in the food supply. (#17)
"When you put milk in your coffee cup and start stirring, you see streaks at first and eventually it all becomes that light color. The ocean behaves in a similar fashion and the mixing is very well understood." (#18)
For now, there is no need to worry. Aside from fish living in close proximity to the Fukushima spill, fish in the Pacific Ocean are safe for human consumption (Source #2).
There are other foods that are being tested for high levels of toxicity. Radiation from Fukushima has affected organisms in many other ecosystems. Water that has been contaminated with radioactive waste has made its way to the West Coast in the United States, where crops are becoming exposed to this toxicity. Cows then eat grass that has been grown with this contaminated water. Once their milk has tested positive for radiation, it is dangerous to drink. Cow's meat and milk are becoming increasingly unsafe to consume. While this problem isn't a concern right now, it is very likely that it will become an issue in the near future. (#7)
Food Chain Diagram, Resource #25
Radiation from the cow to humans, Resource #24
Resource ##27