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

Matsuda, Keishi; Takagi, Kaori; Tomiya, Atsushi; Enomoto, Masahiro; Tsuboi, Jun‐ichi; Kaeriyama, Hideki; Ambe, Daisuke; Fujimoto, Ken; Ono, Tsuneo; Uchida, Keiji; Yamamoto, Shoichiro

doi:10.1007/978-4-431-55537-7_15

Cited by 3 publications

(2 citation statements)

References 17 publications

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“…Because differences in trophic levels mean differences in food habits, these results suggest that food habits affect the proportion of 137 Cs in muscle. In addition, piscivorous fish muscle is known to have a higher activity concentration of 137 Cs compared to non-piscivorous fish muscle [20][21][22] , suggesting the former easily accumulate 137 Cs in muscle tissue. Food habits of fish change during their growth process.…”

Section: Component Parts Of Freshwater Fishmentioning

confidence: 99%

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

Ishii

Furota

Kagami

et al. 2021

Sci Rep

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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.

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Section: Component Parts Of Freshwater Fishmentioning

confidence: 99%

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

Ishii

Furota

Kagami

et al. 2021

Sci Rep

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show abstract

“…In addition, the water residence time of ca. 0.48 years (Fukushima and Arai, 2014;Matsuda et al, 2015) and the location within a coastal mountainous region induce high sediment accumulation, in particular after heavy rainfall and typhoon events Lepage et al, 2016).…”

Section: Study Sitementioning

confidence: 99%

Source dynamics of radiocesium-contaminated particulate matter deposited in an agricultural water reservoir after the Fukushima nuclear accident

Huon

Hayashi²,

Laceby

et al. 2018

Science of The Total Environment

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The Fukushima nuclear accident in Japan resulted in the deposition of radiocesium over forested and rural landscapes northwest of the power plant. Although there have been several investigations into the dynamics of contaminated river sediment, less attention has been paid to the sources of deposited particulate matter in dams and reservoirs. In the Fukushima Prefecture, there are 10 significant dams and over a 1000 reservoirs for both agricultural and surface water management. These reservoirs may have trapped a significant volume of radiocesium-contaminated sediment. Therefore, characterizing the sources of contaminated particulate matter is important for the ongoing management of contamination in the region. Accordingly, the composition of particulate matter deposited in the Mano Dam reservoir, approximately 40km northwest of the power plant, was investigated with the analyses and modelling of carbon and nitrogen stable isotope ratios (δC and δN), total organic carbon (TOC) and total nitrogen (TN) concentrations. Four sediment cores, with lengths ranging 29-41cm, were sampled in the Mano Dam. Source samples from 46 forest soils, 28 cultivated soils and 25 subsoils were used to determine the source contributions of particulate matter. Carbon and nitrogen parameters were analyzed on all samples and a concentration-dependent distribution modelling approach was used to apportion source contributions. Three of the four cores sampled in the Mano Dam reservoir had distinct radiocesium peaks representative of the initial post-accident wash-off phase. Cultivated sources were responsible for 48±7% of the deposited fine particulate matter whereas forests were modelled to contribute 27±6% and subsoil sources 25±4%. Ongoing decontamination of cultivated sources in the Fukushima region should result in a decrease of contaminated matter deposition in reservoirs.

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Accumulation capability for cesium differs among bacterial species: A comprehensive study using bacteria isolated from freshwater and coastal sediment

Wang

et al. 2022

Environmental Pollution

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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

Cited by 3 publications

References 17 publications

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

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

Source dynamics of radiocesium-contaminated particulate matter deposited in an agricultural water reservoir after the Fukushima nuclear accident

Accumulation capability for cesium differs among bacterial species: A comprehensive study using bacteria isolated from freshwater and coastal sediment

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