This is Woods Hole Oceanographic Institution’s infographic, projecting the spread of nuclides from Fukushima through 2016.
On August 18, 2011 the Chinese government announced the detection of an area 100,000 square miles in size in Pacific Ocean waters, containing Cesium radiation levels of up to 300 times normal and Strontium radiation levels up to 100 times normal. The location of this contaminated zone was at distances of up to 800 kilometers from the coast of northeastern Japan.
Presumably, the fisheries and the entire food chain in this expanding area are contaminated. No seafood caught there should be eaten by anyone…including the fish who live there.
Tuna fish can swim up to 400 miles per day and schools of tuna can spread this contamination throughout the Pacific Ocean faster than the ocean currents.