The bioaccumulations of Aga river basin (West Fukushima) The cesium bioaccumulation of those captured in the Mano River was mean 2,657 Bq/kg (n = 3, median 2,900 Bq/kg, range 1,770–3,300 Bq/kg) and the Abukuma River at Date city was mean 1,770 Bq/kg, (n = 11, median 1,170 Bq/kg, range 650–2,080 Bq/kg ). The contamination level of radioactive cesium (quasi-Cs137) of the Ayu, annual and herbivorous species, captured in these rivers or their tributaries between May and September 2011 was measured. The survey results of the contamination level of the bottom soil are Cs134: 11,000 Bq/kg and Cs137: 12,000 Bq/kg in Abukuma River of Date city at Taisho bridge on. Two months after the accident, the Ministry of Environment surveyed the Abukuma River of Date city. While the area downstream and the Abukuma River in Date City found higher contamination. The survey results of the contamination level of the bottom soil are Cs134: 6,900 Bq/kg and Cs137: 7,800 Bq/kg in Mano River of Minamisouma city at Majima bridge on. Two months after the accident, the Ministry of Land, Infrastructure and Transport surveyed the Mano River 11. The Mano River which flows through Iidate Village in the upstream and Minami-souma City. Such areas include Iidate Village and Date City. Due to the topography with the Pacific Ocean in the east and the Abukuma Highlands in the west, the areas in the north to the west of the plant are highly contaminated. The Fukushima Nuclear Power Plant is located in Hamadori. There the Ayu ( Plecoglossidae: Plecoglossus altivelis altivelis), Salmon ( Salmonidae: Oncorhynchus masou, Salvelinus leucomaenis) and carp ( Cyprinidae: Tribolodon hakonensis, Cyprinus carpio, Carassius.sp) are very popular freshwater fish for fishing and angling. The Abukuma Highlands is designated as one of the prefectural parks and rich in endemic wildlife including the indigenous forest green tree frog ( Rhacophorus arboreus) and salamanders ( Hynobius lichenatus, Hynobius nigrescens). The mountain ranges form headwaters and basins of many rivers such as the Abukuma River and the Aga River. There still is a rich natural environment maintained throughout the prefecture with three national parks, one quasi-national park and eleven prefectural parks present. The westernmost Aizu is mountainous with the Aizu Basin in the center. Hamadori is the coastal region facing the Pacific Ocean and separated from Nakadori (central basin) by the Abukuma Highlands. It is divided into three sub-regions by its mountainous topography, i.e., Hamadori, Nakadori and Aizu (from east to west). Highest contaminated area in fukushima prefectureįukushima Prefecture is located in the northeastern part of the Main Island of Japan ( Fig. Therefore, this paper focuses on an overview of active cesium 137 (quasi-Cs137) contaminations of freshwater fish in Fukushima and eastern Japan based on 2011 data published by the Fisheries Agency of the Japanese Government 10. However, in the case of Fukushima, there is little information about freshwater ecosystem contamination in 2011. Most attention was focused on Belarus, the Russian Federation and Ukraine, because of the higher contamination of water bodies in these areas 8, 9. In the case of the Chernobyl Accident, the transfer of radionuclides to fish has been studied in European countries 5, 6, 7. Therefore the contamination of freshwater fish of aquatic bioaccumulation is an important problem 3, 4. Consumption of freshwater fish is an important part of the aquatic pathway for the transfer of radionuclides to the freshwater ecosystem creatures including humans 2. The serious accidents of the Fukushima Nuclear Power Plant have been contaminating a vast area in eastern Japan 1, home of 60 million people.
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