Elucidation of radiocesium contamination mechanisms in fish revealed by cage experiments conducted in the water bodies near the Fukushima Dai-ichi Nuclear Power Plant
Project/Area Number |
17K19279
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Research Category |
Grant-in-Aid for Challenging Research (Exploratory)
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Allocation Type | Multi-year Fund |
Research Field |
Forestry and Forest Products Science, Applied aquatic science, and related fields
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Research Institution | Fukushima University |
Principal Investigator |
Wada Toshihiro 福島大学, 環境放射能研究所, 准教授 (90505562)
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Project Period (FY) |
2017-06-30 – 2020-03-31
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Project Status |
Completed (Fiscal Year 2019)
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Budget Amount *help |
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2018: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2017: ¥2,080,000 (Direct Cost: ¥1,600,000、Indirect Cost: ¥480,000)
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Keywords | 魚類 / 放射性セシウム / 原発事故 / 福島県 / 漁業復興 |
Outline of Final Research Achievements |
The aim of this study is to elucidate the radiocesium contamination mechanisms of fish through multiple approaches such as caging experiments and rearing experiments. Caging experiments of common carp and Japanese eels conducted in a contaminated pond near the Fukushima Dai-ichi Nuclear Power Plant have showed that the Cs concentrations of fish can be increased up to several dozens of Bq/kg through the caging experiments. Japanese dace rearing experiments using Cs-containing pond water revealed that Cs concentrations in muscle tissues were accumulated up to ten times higher than those of rearing water. In contrast, the field surveys in the pond has revealed that Cs concentrations in fish were more than several thousands Bq/kg and concentration factors were averaged around 2400, suggesting strongly that uptake of Cs from food, not from water, would be the primarily Cs contamination route for freshwater fish under the natural environment.
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Academic Significance and Societal Importance of the Research Achievements |
福島原発事故に伴い放出された放射性セシウム(Cs)による淡水魚の放射能汚染の影響は長期化しており、それら汚染メカニズムの解明や将来予測が関連業界や学術界から強く求められている。本研究では、高濃度に汚染された原発周辺における魚類のケージ試験や採集調査、およびCs含有水を用いた飼育試験を行うことで、淡水魚のCsの取込み経路を明らかにした。具体的には、天然環境下では環境水中のCsによる寄与は少なく、餌生物を介したCsの取込みが主な汚染経路であることを明らかにした。 本研究成果は、原発周辺水域における魚類のCs汚染経路の解明に寄与し、特に食物連鎖を介したCsの取込みの重要性を示した点で、意義が大きい。
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Report
(4 results)
Research Products
(54 results)
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[Journal Article] Spatial and seasonal variations of radiocesium concentrations in an algae-grazing annual fish, ayu Plecoglossus altivelis collected from Fukushima Prefecture in 20142019
Author(s)
Morishita, D., Wada, T., Noda, T., Tomiya, A., Enomoto, M., Sato, T., Suzuki, S., Kawata, G.
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Journal Title
Fisheries Science
Volume: 85
Issue: 3
Pages: 295-302
DOI
NAID
Related Report
Peer Reviewed
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[Journal Article] Radiocesium in ponds in the near zone of Fukushima Dai-ichi NPP2018
Author(s)
Konoplev, A.V., Wakiyama, Y., Wada, T., Golosov, V.N., Nanba, K., Takase, T.
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Journal Title
Water Resources
Volume: 45
Issue: 4
Pages: 589-597
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Journal Article] Temporal change of eelgrass Zostera marina bed in Matsukawa-ura Lagoon, Fukushima Prefecture2018
Author(s)
Matsumoto, A., Narita, K., Fujita, T., Sato, T., Matsumoto, I., Wada, T.
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Journal Title
NAID
Related Report
Peer Reviewed
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[Journal Article] Behavior of 137Cs in ponds in the vicinity of the Fukushima Dai-ichi nuclear power plant2017
Author(s)
Wakiyama, Y., Konoplev, A., Wada, T., Takase, T., Byrnes, I., Carradine, M., Nanba, K.
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Journal Title
Journal of Environmental Radioactivity
Volume: 178-179
Pages: 267-376
DOI
Related Report
Peer Reviewed / Int'l Joint Research
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[Presentation] Diel and seasonal movement and migration of juvenile spotted halibut Verasper variegatus (Family Pleuronectidae) released in a shallow brackish lagoon in Fukushima, Japan, revealed by acoustic telemetry2017
Author(s)
Wada, T., Noda, T., Iwasaki, T., Sato, T., Hori, T., Arai, N., Mitamura, H.
Organizer
10th International symposium on flatfish
Related Report
Int'l Joint Research
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