It was announced by Tepco today that 190,000 Bq/kg of radioactive cesium was found in murasoi rockfish in the Fukushima harbor area. This is the same fish species in which 254,000 Bq/kg was found last January.
The Japanese Meteorological Research Institute announced at a meeting of the IAEA that 60 billion becquerels of cesium was determined to be released to the open ocean in one day.
After the recent typhoon, 1,130 tons of radioactive rainwater was dumped into the ocean, containing 8.85 million becquerels. Obviously, the day-to-day releases far exceed the excess contaminated rainfall from the typhoon.
The following video was shot at a fish market in Ibaraki prefecture. The external radiation dose ranged up to 0.87 uSv/hr in Japanese fish. Fish from foreign countries did not have increased radiation levels.
Note that the plastic packaging blocks all the alpha radiation (like uranium and plutonium), and the packaging, along with the fish mass itself, blocks most of the beta radiation (like strontium and tritium). The beta radiation being released into the Pacific far exceeds the gamma radiation that we see here.
The Japanese government is considering filing suit in the WTO against South Korea for banning the importation of Japanese fish into their country. They say radioactive fish is a “harmful rumor.”