Inequality in the distribution of 137Cs contamination within freshwater fish bodies and its affecting factors

Abstract Contamination of freshwater fishes with 137Cs remains as a serious problem in Japan, nearly 10 years after the Fukushima nuclear power plant accident, but there is limited information on the distribution of 137Cs contamination in fish bodies. The 137Cs distribution can be used for the estim...

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Autores principales:	Nobuyoshi Ishii, Toshio Furota, Maiko Kagami, Keiko Tagami, Shigeo Uchida
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/66c8c800db8f4299beb952b46f227917
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spelling	oai:doaj.org-article:66c8c800db8f4299beb952b46f2279172021-12-02T13:19:28ZInequality in the distribution of 137Cs contamination within freshwater fish bodies and its affecting factors10.1038/s41598-021-85291-62045-2322https://doaj.org/article/66c8c800db8f4299beb952b46f2279172021-03-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-85291-6https://doaj.org/toc/2045-2322Abstract Contamination of freshwater fishes with 137Cs remains as a serious problem in Japan, nearly 10 years after the Fukushima nuclear power plant accident, but there is limited information on the distribution of 137Cs contamination in fish bodies. The 137Cs distribution can be used for the estimation of internal radiation exposure through the consumption of fish and for the dose estimation of fish themselves. In this study, the 137Cs distribution in the bodies of 8 freshwater fish species was investigated as percentages of total body burden for fish inhabiting Lake Inba. Fish samples were caught in stake nets placed close to the shore approximately once a month. After the measurement of body length and fresh weight, the radioactivities of 137Cs in muscle, internal organs, spawn, milt and bone were assayed using high-purity germanium detectors. Analysis of all fish samples showed that the 137Cs distribution was highest in muscle (54 ± 12%), followed by internal organs (7.8 ± 4.6%), spawn (7.4 ± 5.4%), milt (3.2 ± 2.1%) and bone (1.2 ± 0.58%). Among fish species, the highest proportion of 137Cs in muscle was detected in largemouth bass (71 ± 1 3%), followed by snakehead (69 ± 14%), channel catfish (63 ± 17%), common carp (62 ± 14%), barbel steed (58 ± 6.5%), silver carp (57 ± 7.7%), bluegill (53 ± 4.7%), and crucian carp (50 ± 10%). These results suggested that the 137Cs in muscle was likely to be high in piscivorous fishes compared to omnivorous fishes, especially crucian carp. The proportion of 137Cs in muscle of crucian carp was not explained either by body length or fresh weight. However, a positive correlation was found between the proportion of 137Cs in muscle and the condition factor which was an indicator of nutritional status calculated from a length–weight relationship. This correlation implied that more 137Cs accumulated in muscle tissue of a fish species with high nutritional status. This is the first study to show that condition factor is more important than body length and wet weight in explaining the high proportion of 137Cs in muscle tissues, at least for crucian carp.Nobuyoshi IshiiToshio FurotaMaiko KagamiKeiko TagamiShigeo UchidaNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-9 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Nobuyoshi Ishii Toshio Furota Maiko Kagami Keiko Tagami Shigeo Uchida Inequality in the distribution of 137Cs contamination within freshwater fish bodies and its affecting factors
description	Abstract Contamination of freshwater fishes with 137Cs remains as a serious problem in Japan, nearly 10 years after the Fukushima nuclear power plant accident, but there is limited information on the distribution of 137Cs contamination in fish bodies. The 137Cs distribution can be used for the estimation of internal radiation exposure through the consumption of fish and for the dose estimation of fish themselves. In this study, the 137Cs distribution in the bodies of 8 freshwater fish species was investigated as percentages of total body burden for fish inhabiting Lake Inba. Fish samples were caught in stake nets placed close to the shore approximately once a month. After the measurement of body length and fresh weight, the radioactivities of 137Cs in muscle, internal organs, spawn, milt and bone were assayed using high-purity germanium detectors. Analysis of all fish samples showed that the 137Cs distribution was highest in muscle (54 ± 12%), followed by internal organs (7.8 ± 4.6%), spawn (7.4 ± 5.4%), milt (3.2 ± 2.1%) and bone (1.2 ± 0.58%). Among fish species, the highest proportion of 137Cs in muscle was detected in largemouth bass (71 ± 1 3%), followed by snakehead (69 ± 14%), channel catfish (63 ± 17%), common carp (62 ± 14%), barbel steed (58 ± 6.5%), silver carp (57 ± 7.7%), bluegill (53 ± 4.7%), and crucian carp (50 ± 10%). These results suggested that the 137Cs in muscle was likely to be high in piscivorous fishes compared to omnivorous fishes, especially crucian carp. The proportion of 137Cs in muscle of crucian carp was not explained either by body length or fresh weight. However, a positive correlation was found between the proportion of 137Cs in muscle and the condition factor which was an indicator of nutritional status calculated from a length–weight relationship. This correlation implied that more 137Cs accumulated in muscle tissue of a fish species with high nutritional status. This is the first study to show that condition factor is more important than body length and wet weight in explaining the high proportion of 137Cs in muscle tissues, at least for crucian carp.
format	article
author	Nobuyoshi Ishii Toshio Furota Maiko Kagami Keiko Tagami Shigeo Uchida
author_facet	Nobuyoshi Ishii Toshio Furota Maiko Kagami Keiko Tagami Shigeo Uchida
author_sort	Nobuyoshi Ishii
title	Inequality in the distribution of 137Cs contamination within freshwater fish bodies and its affecting factors
title_short	Inequality in the distribution of 137Cs contamination within freshwater fish bodies and its affecting factors
title_full	Inequality in the distribution of 137Cs contamination within freshwater fish bodies and its affecting factors
title_fullStr	Inequality in the distribution of 137Cs contamination within freshwater fish bodies and its affecting factors
title_full_unstemmed	Inequality in the distribution of 137Cs contamination within freshwater fish bodies and its affecting factors
title_sort	inequality in the distribution of 137cs contamination within freshwater fish bodies and its affecting factors
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/66c8c800db8f4299beb952b46f227917
work_keys_str_mv	AT nobuyoshiishii inequalityinthedistributionof137cscontaminationwithinfreshwaterfishbodiesanditsaffectingfactors AT toshiofurota inequalityinthedistributionof137cscontaminationwithinfreshwaterfishbodiesanditsaffectingfactors AT maikokagami inequalityinthedistributionof137cscontaminationwithinfreshwaterfishbodiesanditsaffectingfactors AT keikotagami inequalityinthedistributionof137cscontaminationwithinfreshwaterfishbodiesanditsaffectingfactors AT shigeouchida inequalityinthedistributionof137cscontaminationwithinfreshwaterfishbodiesanditsaffectingfactors
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Inequality in the distribution of 137Cs contamination within freshwater fish bodies and its affecting factors

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