While the Japanese government spokesman has declared that “Japan’s marine life is in no danger regardless of the radiation levels in the waters near the crippled Fukushima 1 Nuclear Power Plant” on 26 March,
(http://en.rian.ru/world/20110326/163216605.html) experts believe that radioactive particles will have a noticeable and even lasting impact. The radioactive isotopes detected so far have been:
§ Iodine-131 (half life of 8 days) – 3,355 times the legal limit
§ Caesium-135 – 117.3 times the legal limit
§ Caesium-17 (half life of 30 days) – 70.6 times the legal limit
A study on the internet on the uptake of radioactive iodine of 3 seagrass species that are found in Japan (Hijiki - Hizikia fusiforme, Nejimoku - Sargassum sagamianum and Tsunomata - Chondrus ocellatus) showed that the concentration/levels taken in by seagrass was much more significant than those of fish. However, I was unable to find the exact numerical data of the concentrations taken up by those species.
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