Radiocesium contamination of greenlings (Hexagrammos otakii) off the coast of Fukushima

Shigenobu, Yuya; Fujimoto, Ken; Ambe, Daisuke; Kaeriyama, Hideki; Ono, Tsuneo; Morinaga, Kenji; Nakata, Kazuyoshi; Morita, Takami; Watanabe, Tomowo

doi:10.1038/srep06851

Cited by 29 publications

(19 citation statements)

References 21 publications

(32 reference statements)

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“…As a consequence, radioactive Cs would be transferred to the higher trophic level not only via surrounding seawater but also by prey-predator interactions in the pelagic ecosystem. Shigenobu et al (2014) reported the radioactive Cs concentrations of fat greenling (Hexagrammos otakii) caught off the coast of Fukushima Prefecture, and reported two outlier specimens caught in August 2012 and May 2013 which had ambiguously high 137 Cs concentrations of more than 1000 Bq/kg-wet. Probability analysis indicated that the two outlier fat greenlings had migrated from the port of FNPP.…”

Section: Introductionmentioning

confidence: 99%

Oceanic dispersion of Fukushima‐derived radioactive cesium: a review

Kaeriyama

2016

Fisheries Oceanography

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This review summarizes the more than 70 papers published during the 4 years since the Fukushima Dai-ichi nuclear power plant accident that occurred on 11 March 2011, and details the radioactive cesium dispersion pattern in the North Pacific and adjacent seas. The total amount of Fukushima-derived radioactive cesium released into the North Pacific via atmospheric deposition and direct release, spatial and temporal changes in the Pacific coast around the accident site, and the concentration levels of radioactive cesium around the Japanese Islands, not only the Pacific coast but also in adjacent seas, such as Japan Sea, East China Sea are summarized. Based on observational data mostly obtained during 2 years since the accident, and simulation results, oceanic dispersion of radioactive cesium in the entire area of the North Pacific is described. The Fukushima-derived radioactive cesium dispersed eastward as surface water and extended to the eastern side of the North Pacific in 2014, and was also observed via a southward intrusion to subsurface waters as Subtropical Mode Water and Central Mode Water. The radioactive cesium movement related to mode water is important in terms of the circulation of cesium into the ocean interior. Some new technologies and techniques concerning emergency monitoring of radioactivity in the ocean environment are also reported, the effectiveness of which has been demonstrated by use in relation to the Fukushima accident.

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Section: Introductionmentioning

confidence: 99%

Oceanic dispersion of Fukushima‐derived radioactive cesium: a review

Kaeriyama

2016

Fisheries Oceanography

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“…We selected those species somewhat subjectively. Sebastes cheni (Japanese white seaperch) and Hexagrammos otakii (fat greenling) are well known as highly contaminated demersal fish (7,9,18). Salvelinus leucomaenis leucomaenis and Anguilla japonica are highly contaminated freshwater and diadromous fish from our analysis.…”

Section: Resultsmentioning

confidence: 95%

Risk assessment of radioisotope contamination for aquatic living resources in and around Japan

Okamura

Ikeda

Morita

et al. 2016

Proc. Natl. Acad. Sci. U.S.A.

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Food contamination caused by radioisotopes released from the Fukushima Dai-ichi nuclear power plant is of great public concern. The contamination risk for food items should be estimated depending on the characteristics and geographic environments of each item. However, evaluating current and future risk for food items is generally difficult because of small sample sizes, high detection limits, and insufficient survey periods. We evaluated the risk for aquatic food items exceeding a threshold of the radioactive cesium in each species and location using a statistical model. Here we show that the overall contamination risk for aquatic food items is very low. Some freshwater biota, however, are still highly contaminated, particularly in Fukushima. Highly contaminated fish generally tend to have large body size and high trophic levels.detection limit | radiocesium | random effects | statistical risk assessment |

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“…Shigenobu et al . () estimated that the heavily contaminated individuals of fat greenling had absorbed much radiocesium within or close to the FNPP port over a certain period immediately after the accident before moving offshore. In addition, on 17 November 2013, 12400 Bq kg −1 w.w. of radiocesium was detected in the muscle‐tissue sample of a blackhead seabream collected approximately 30 km south of the FNPP (Fisheries Research Agency, ).…”

Section: Discussionmentioning

confidence: 99%

“…Off the coast of Fukushima Prefecture, samples of fat greenling (Hexagrammos otakii) caught on 1 August 2012 and 8 May 2013, for which radiocesium concentrations of 25800 Bq kg À1 w.w. and 1700 Bq kg À1 w.w., respectively, were detected in their muscle tissues (Tokyo Electric Power Corporation, 2012). Shigenobu et al (2014) estimated that the heavily contaminated individuals of fat greenling had absorbed much radiocesium within or close to the FNPP port over a certain period immediately after the accident before moving offshore. In addition, on 17 November 2013, 12400 Bq kg À1 w.w. of radiocesium was detected in the muscle-tissue sample of a blackhead seabream collected approximately 30 km south of the FNPP (Fisheries Research Agency, 2014).…”

Section: Discussionmentioning

confidence: 99%

Radiocesium contamination of aquatic organisms in the estuary of the Abukuma River flowing through Fukushima

Shigenobu

Ambe

Ono

et al. 2017

Fisheries Oceanography

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In the summer of 2013, we measured the radiocesium ( 134 Cs and 137 Cs) concentrations in aquatic organisms inhabiting the estuary of the Abukuma River, which flows through the Fukushima and Miyagi Prefectures. Radiocesium concentrations in four muscle-tissue samples of blackhead seabream (Acanthopagrus schlegeli) [1240, 914, 202 and 106 Bq kg À1 wet weight (w.w.)] and two whole-body samples deriving from multiple individuals of flathead grey mullet (Mugil cephalus) (129 and 110 Bq kg À1 w.w.) exceeded the Japanese standard limit for radiocesium levels in foods (100 Bq kg À1 w.w.). However, radiocesium concentrations in the other fish samples were lower than the Japanese standard limit. In addition, radiocesium concentrations in crustaceans, major prey items of omnivorous and carnivorous fish species in the Abukuma River estuary, were generally low (0.444-15.1 Bq kg À1 w.w.). Stable isotope analysis indicated that the feeding habit of the three heavily contaminated blackhead seabream, which the radiocesium concentrations were about several times or more higher than the Japanese standard limit, were similar to those of other individuals collected from the same sampling site. Therefore, the difference in the radiocesium level between the three heavily contaminated individuals and the lesscontaminated individuals of blackhead seabream was not because of a recent feeding habit in the Abukuma River estuary. Environmental conditions in the Abukuma River estuary in the summer of 2013 would not have had the potential to increase radiocesium concentrations in the muscle tissues of fish inhabiting the estuary to levels greater than 100 Bq kg À1 w.w.

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Radiocesium contamination of greenlings (Hexagrammos otakii) off the coast of Fukushima

Cited by 29 publications

References 21 publications

Oceanic dispersion of Fukushima‐derived radioactive cesium: a review

Oceanic dispersion of Fukushima‐derived radioactive cesium: a review

Risk assessment of radioisotope contamination for aquatic living resources in and around Japan

Radiocesium contamination of aquatic organisms in the estuary of the Abukuma River flowing through Fukushima

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