Radiocaesium concentrations in the muscle and eggs of salmonids from Lake Chuzenji, Japan, after the Fukushima fallout

Yamamoto, Shoichiro; Yokoduka, Tetsuya; Fujimoto, Ken; Takagi, Kaori; Ono, Tsuneo

doi:10.1111/jfb.12368

Cited by 17 publications

(3 citation statements)

References 18 publications

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“…In Lake Chuzenji, mean muscle radiocaesium concentrations of salmonid fishes (kokanee, masu salmon, brown trout (Salmo trutta), and lake trout (Salvelinus namaycush)) collected during September to December 2012 were in the range of 142.9-249.2 Bq·kg -1 (wet mass; Yamamoto et al 2014). In this study, substantial accumulation of radiocaesium was also confirmed in muscle tissue of hatchery-reared salmonids after release into cages set in Lake …”

Section: Discussionsupporting

confidence: 64%

“…After the accident, radiocaesium contamination was quickly transferred to freshwater and marine ecosystems, which resulted in elevated radiocaesium concentrations in many fish and invertebrate species (see, for example, Buesseler 2012; Tateda et al 2013;Yamamoto et al 2014). Radiocaesium contamination in freshwater fish has received particular attention, with accumulated evidence from the Chernobyl nuclear accident (Ukraine) showing that higher concentrations of radionuclides persisted in freshwater fish from several European lakes for 10 years or more (see, for example, Jonsson et al 1999;Brittain and Gjerseth 2010;Rask et al 2012).…”

Section: Introductionmentioning

confidence: 99%

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Assessment of radiocaesium accumulation by hatchery-reared salmonids after the Fukushima nuclear accident

Yamamoto

MutouKouji

NakamuraHidefumi

et al. 2014

Can. J. Fish. Aquat. Sci.

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To understand the process of radiocaesium uptake in salmonids after the Fukushima Dai-ichi Nuclear Power Plant accident, a lake caging experiment and two captive-rearing experiments with controlled radiocaesium concentrations of water and feed were conducted in and around Lake Chuzenji, central Honshu Island, Japan (160 km from the station). Substantial accumulations of radiocaesium were confirmed in muscle of hatchery-reared kokanee (Oncorhynchus nerka) and masu salmon (Oncorhynchus masou) after release into the cages, indicating that radionuclide contamination of fish is an ongoing process, 1.5 years after the nuclear accident. Two captive experiments, controlling water and feed radiocaesium levels, showed that direct radiocaesium transfer from water (43 mBq·L -1 ) in Lake Chuzenji to muscle tissue was undetected, at least during the ϳ90-day experimental period, whereas a rapid increase in radiocaesium levels was observed when fish were cultured using radiocaesiumcontaminated pellets. The results revealed that radiocaesium contamination in salmonids is mainly via the food chain and that direct intake from water via the skin, gut, and (or) gills has no major direct impact on muscle tissue concentrations. Résumé :Afin de comprendre le processus d'absorption du césium radioactif dans les salmonidés après l'accident à la centrale nucléaire de Fukushima Dai-ichi, une expérience en cage en lac et deux expériences d'élevage en captivité dans lesquelles les concentrations de césium radioactif dans l'eau et dans les aliments étaient contrôlées ont été menées dans le lac Chuzenji et ses alentours, dans le centre de l'île de Honshu (à 160 km de la centrale, au Japon,). La présence d'importantes accumulations de césium radioactif dans les muscles de saumons rouges (Oncorhynchus nerka) et masou (Oncorhynchus masou) élevés en alevinières après leur lâcher dans des cages a été confirmée, indiquant que la contamination aux radionucléides dans les poissons se poursuit 1,5 an après l'accident nucléaire. Deux expériences en captivité dans lesquelles les concentrations de césium radioactif dans l'eau et dans les aliments étaient contrôlées ont démontré que le transfert direct de césium radioactif de l'eau (43 mBq·L -1 ) dans le lac Chuzenji vers les tissus musculaires n'était pas détectable au moins pendant les quelque 90 jours qu'ont duré les expériences, alors qu'une augmentation rapide des concentrations de césium radioactif a été observée quand les poissons étaient nourris avec des boulettes contaminées au césium radioactif. Les résultats révèlent que la contamination au césium radioactif dans les salmonidés s'opère principalement par la chaîne alimentaire et que l'absorption directe du césium radioactif dans l'eau à travers la peau, le tube digestif ou les branchies n'a pas d'impact significatif direct sur les concentrations dans les tissus musculaires. [Traduit par la Rédaction]

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Section: Discussionsupporting

confidence: 64%

Section: Introductionmentioning

confidence: 99%

Assessment of radiocaesium accumulation by hatchery-reared salmonids after the Fukushima nuclear accident

Yamamoto

MutouKouji

NakamuraHidefumi

et al. 2014

Can. J. Fish. Aquat. Sci.

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“…Acknowledgments This chapter was revised from a paper published by Yamamoto et al ( 2014b ). The authors are grateful to Kouji Mutou and the Lake Chuzenji Fishermen's Cooperative for collecting the fi sh samples and to Masato Murakami, Tomoko Okazaki, Yumiko Watanuki, and Maki Yoshida for their assistance with the sample assays and data analyses.…”

mentioning

confidence: 99%

Radiocesium Concentrations in the Muscle and Eggs of Salmonids from Lake Chuzenji, Japan, After the Fukushima Fallout

Yamamoto

Yokoduka

Fujimoto

et al. 2015

Impacts of the Fukushima Nuclear Accident on Fish and Fishing Grounds

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Approximately 18 months (September-December 2012) after the Fukushima Dai-ichi Nuclear Power Plant accident, elevated radiocesium concentrations were detected in muscle and egg samples from masu salmon ( Oncorhynchus masou ), kokanee ( Oncorhynchus nerka ), brown trout ( Salmo trutta ), and lake trout ( Salvelinus namaycush ) from the Lake Chuzenji system, central Honshu Island, Japan (160 km from the station). Mean muscle concentrations were 142.9-249.2 Bq/ kg-wet, and mean egg concentrations were 38.7-79.0 Bq/kg-wet. No relationship between fork length and muscle radiocesium concentration was observed in any of the species, but signifi cant relationships were found between individual muscle and egg radiocesium concentrations from masu salmon, brown trout, and lake trout.

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Comparison of the Radioactive Cesium Contamination Level of Fish and their Habitat Among Three Lakes in Fukushima Prefecture, Japan, After the Fukushima Fallout

Matsuda

Takagi²,

Tomiya

et al. 2015

Impacts of the Fukushima Nuclear Accident on Fish and Fishing Grounds

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Levels of radiocesium ( 134 Cs + 137 Cs) contamination in lake water, bottom sediment, plankton, and fi sh were investigated in three geographically separated lakes in Fukushima Prefecture (Lake Hayama, Lake Akimoto, and Lake Tagokura) between June 2012 and November 2013. Levels of contamination differed among the three lakes, with the highest levels in each measured component found in Lake Hayama, followed by Lake Akimoto, and the least contamination in Lake Tagokura. Among the lakes, the magnitude of contamination decreased with distance from the Fukushima Dai-ichi Nuclear Power Plant. Mean radiocesium concentrations were higher in piscivorous fi sh than in other fi sh, possibly refl ecting differences in trophic levels. Radiocesium concentrations of the lake water, bottom sediment, plankton, and fi sh were signifi cantly correlated with surface soil radiocesium content near lake sites.

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Radiocaesium concentrations in the muscle and eggs of salmonids from Lake Chuzenji, Japan, after the Fukushima fallout

Cited by 17 publications

References 18 publications

Assessment of radiocaesium accumulation by hatchery-reared salmonids after the Fukushima nuclear accident

Assessment of radiocaesium accumulation by hatchery-reared salmonids after the Fukushima nuclear accident

Radiocesium Concentrations in the Muscle and Eggs of Salmonids from Lake Chuzenji, Japan, After the Fukushima Fallout

Comparison of the Radioactive Cesium Contamination Level of Fish and their Habitat Among Three Lakes in Fukushima Prefecture, Japan, After the Fukushima Fallout

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