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The Fukushima Daiichi Nuclear Power Plant (FNPP) accident, induced by the Great East Japan Earthquake on March 11, 2011, resulted in extensive contamination of the surrounding environment with radioactive materials. In particular, the forest ecosystem northwest of FNPP in Fukushima Prefecture has been significantly affected, highlighting the need for regular assessment of the status of fish species residing in the rivers running through the contaminated area. This study reports on radioactive cesium-137 (137Cs) concentrations measured in masu salmon in 2014, 2021, 2022, and 2023. Also, the abundance of melanomacrophage centers (MMCs) in the spleen was measured to assess the current status, that is, changes in pollution and its effects on freshwater fish. The results indicate that contamination persists even 12 years after the accident and fish appear to be suffering from the effect of long-term radiation exposure. Correlations between the contamination status of fish at the time of monitoring (2014, 2021, 2023) and the relative area occupied by MMCs in the spleen imply that the increase of MMCs in the spleen was probably caused by long-term low-dose-rate radiation exposure, and therefore MMCs are a candidate biomarker of radiocontamination.

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Current Status of Long-Term Low-Dose-Rate Radiation Exposure to Masu Salmon (Oncorhynchus masou) in Two Rivers Flowing Near Fukushima Daiichi Nuclear Power Plant

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  • 出版模式：

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  • 发表日期：

    2026年

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  • Shuhei Naganuma,
  • Gyoh Kawada,
  • Megu Ohtaki,
  • Masamichi Nakajima

摘要

The Fukushima Daiichi Nuclear Power Plant (FNPP) accident, induced by the Great East Japan Earthquake on March 11, 2011, resulted in extensive contamination of the surrounding environment with radioactive materials. In particular, the forest ecosystem northwest of FNPP in Fukushima Prefecture has been significantly affected, highlighting the need for regular assessment of the status of fish species residing in the rivers running through the contaminated area. This study reports on radioactive cesium-137 (137Cs) concentrations measured in masu salmon in 2014, 2021, 2022, and 2023. Also, the abundance of melanomacrophage centers (MMCs) in the spleen was measured to assess the current status, that is, changes in pollution and its effects on freshwater fish. The results indicate that contamination persists even 12 years after the accident and fish appear to be suffering from the effect of long-term radiation exposure. Correlations between the contamination status of fish at the time of monitoring (2014, 2021, 2023) and the relative area occupied by MMCs in the spleen imply that the increase of MMCs in the spleen was probably caused by long-term low-dose-rate radiation exposure, and therefore MMCs are a candidate biomarker of radiocontamination.