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2. Overview of active cesium contamination of freshwater fish in Fukushima and Eastern Japan

bstract

This paper focuses on an overview of radioactive cesium 137 (quasi-Cs137 included Cs134) contamination of freshwater fish in Fukushima and eastern Japan based on the data published by the Fisheries Agency of the Japanese Government in 2011. In the area north and west of the Fukushima Nuclear plant, freshwater fish have been highly contaminated. For example, the mean of active cesium (quasi-Cs137) contamination of Ayu (Plecoglossus altivelis) is 2,657 Bq/kg at Mano River, 20–40 km north-west from the plant. Bioaccumulation is observed in the Agano river basin in Aizu sub-region, 70–150 km west from the plant. The active cesium (quasi-Cs137) contamination of carnivorous Salmondae is around 2 times higher than herbivorous Ayu. The extent of active cesium (quasi-Cs137) contamination of Ayu is observed in the entire eastern Japan. The some level of the contamination is recognized even in Shizuoka prefecture, 400 km south-west from the plant.

The serious accidents of the Fukushima Nuclear Power Plant have been contaminating a vast area in eastern Japan1, home of 60 million people. Consumption of freshwater fish is an important part of the aquatic pathway for the transfer of radionuclides to the freshwater ecosystem creatures including humans2. Therefore the contamination of freshwater fish of aquatic bioaccumulation is an important problem3,4. In the case of the Chernobyl Accident, the transfer of radionuclides to fish has been studied in European countries5,6

http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3638159/#__sec6title