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Figure 3
The isogram map shows average active cesium (quasi-Cs137) contamination level of the Ayu (Plecoglossus) captured in between May and September 2011 on each prefectures in eastern Japan.
Each isogram center points are each prefecture's capital city. We created the map using the GIS software which is 'MANDARA for windows 2000/XP/VISTA/7 Version 9.35' (the software copyright: 1992–2011 Tani Kenji).
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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.
Overview of active cesium contamination of freshwater fish in Fukushima and Eastern Japan
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