Effects of the nuclear disaster on marine products in Fukushima

Wada, Toshihiro; Nemoto, Yoshiharu; Shimamura, Shinya; Fujita, Tsuneo; Mizuno, Takuji; Sohtome, Tadahiro; Kamiyama, Kyoichi; Morita, Takami; Igarashi, Satoshi

doi:10.1016/j.jenvrad.2013.05.008

Cited by 157 publications

(133 citation statements)

References 18 publications

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“…This result implies that the potential effect of sea sediment radiocesium on benthos would not be too different between the area south of FNPP with a bottom depth ranging from 100 to 200 m and north of FNPP with a bottom depth shallower than 100 m, despite a significant Cs bulk difference between these areas. Wada et al (2013) detected similar radiocesium level of demersal fishes between these two areas after 2012. These findings suggest that Cs org can be used as an indicator of the potential effect of sediment radiocesium on the demersal ecosystem.…”

Section: Horizontal Distribution Of Cs Org In Off-fukushima Continentmentioning

confidence: 56%

Radiocesium Concentrations in the Organic Fraction of Sea Sediments

Ono

Ambe

Kaeriyama

et al. 2015

Impacts of the Fukushima Nuclear Accident on Fish and Fishing Grounds

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Sequential chemical extraction of radiocesium was performed on 22 surface sediment samples to assess radiocesium concentration in the organic fraction of sea sediments (Cs org ). Our results showed that Cs org of sea sediments was significantly larger than that of bulk sediments (Cs bulk ). The concentration factor of radiocesium in organic fraction against the bulk concentration (CF) varied from 3 to 50 off the Fukushima continental margin and showed a proportional relationship with median grain size and an inversely proportional relationship with organic content (OC) of the sediment. By using these relationships, the regression equation of Cs org based on median grain size, organic content, and Cs bulk was determined to construct a two-dimensional (2-D) distribution of Cs org along the continental margin off the Fukushima region. The resultant map showed that the continental margin north of Fukushima Dai-ichi Nuclear Power Plant (FNPP) had moderate Cs org values despite very low Cs bulk . On the other hand, sediments sampled at the mouth of Abukuma River showed extremely low CF, which might have been caused by the existence of river-derived sediment particles.

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Section: Horizontal Distribution Of Cs Org In Off-fukushima Continentmentioning

confidence: 56%

Radiocesium Concentrations in the Organic Fraction of Sea Sediments

Ono

Ambe

Kaeriyama

et al. 2015

Impacts of the Fukushima Nuclear Accident on Fish and Fishing Grounds

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“…Detailed outcomes of the tests above are also available from Wada et al (2013). Several other analyses have also been published by independent researchers from outside the government.…”

Section: State Of Radioactive Substances In Marine Speciesmentioning

confidence: 99%

Impacts of the Nuclear Power Plant Accident and the Start of Trial Operations in Fukushima Fisheries

Yagi

2016

Agricultural Implications of the Fukushima Nuclear Accident

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The large-scale release of radioactive substances from the Fukushima Daiichi Nuclear Power Plant operated by the Tokyo Electric Power Company in March 2011 caused significant damage to local fisheries. The Fukushima Prefectural Federation of Fisheries Cooperative Associations immediately suspended all commercial fishing activities within Fukushima. The national government issued instructions prohibiting the sale of certain marine products caught in the waters off Fukushima Prefecture due to food safety concerns. The prohibition is gradually being lifted; in June 2012, the Fisheries Cooperative Associations resumed commercial fishing of three species (two octopus species and one shellfish species) as trial operations. Subsequently, the list has expanded, and as of January 2015, 58 species have been approved for trial operations. The scale of operations is far smaller than before the tsunami and nuclear accident. A full recovery of Fukushima fisheries cannot be realized until the government lifts prohibitions on the sale of all remaining marine species, and the timing of such a decision remains unclear.

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“…In this study, none of the fi sh specimens had a radiocesium concentration higher than 10,000 Bq/kg-wet weight. Figure 12.2 shows the time-series trend of radiocesium concentration of fat greenlings caught within the FNPP port and off the coast of Fukushima from May Previous studies have reported that radiocesium concentration in marine organisms (Wada et al 2013 ) and sediments ) within the southern coastal area of FNPP was comparatively higher than those in other areas. However, according to our data and published datasets from MAFF and TEPCO, fat greenlings with a radiocesium concentration greater than 10,000 Bq/kg-wet were not identifi ed, not even in specimens collected from highly contaminated areas.…”

Section: Radiocesium Contamination Of Fat Greenlings Off the Coast Ofmentioning

confidence: 99%

“…It is known that cesium absorbed by marine organisms is excreted by their potassium ion transport system during osmoregulation (Furukawa et al 2012 ;Kaneko et al 2013 ). Therefore, a rapid decrease in the radiocesium concentration of seawater would reduce contamination of marine organisms, especially for pelagic fi sh species (Buesseler 2012 ;Wada et al 2013 ). Temporal trends in radiocesium concentration of marine organisms off the coast of Fukushima gradually declined after the summer of 2011 (Wada et al 2013 ).…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, a rapid decrease in the radiocesium concentration of seawater would reduce contamination of marine organisms, especially for pelagic fi sh species (Buesseler 2012 ;Wada et al 2013 ). Temporal trends in radiocesium concentration of marine organisms off the coast of Fukushima gradually declined after the summer of 2011 (Wada et al 2013 ). Marine organisms with a radiocesium concentration greater than 10,000 Bq/kg-wet were not reported until 1.5 years after April 2011.…”

Section: Introductionmentioning

confidence: 99%

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Evaluating the Probability of Catching Fat Greenlings (Hexagrammos otakii) Highly Contaminated with Radiocesium off the Coast of Fukushima

Shigenobu

Fujimoto

Ambe

et al. 2015

Impacts of the Fukushima Nuclear Accident on Fish and Fishing Grounds

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On 1 August 2012, a total of 25,800 Bq/kg-wet of radiocesium ( 134 Cs = 9,800 Bq/kg-wet, 137 Cs = 16,000 Bq/kg-wet) was detected in the muscle tissue of two fat greenlings ( Hexagrammos otakii ) caught approximately 20 km north of the Fukushima Dai-ichi Nuclear Power Plant (FNPP). To estimate the contamination level of this fi sh species off the coast of Fukushima, we measured the radiocesium concentration in the muscle tissue of individual fat greenlings in 2012 and 2013. Radiocesium concentration of fat greenlings caught in southern coastal waters from the FNPP was signifi cantly higher than that of fat greenlings collected in other waters off the coast of Fukushima. However, fat greenlings with a radiocesium concentration greater than 10,000 Bq/kg-wet were not detected, not even from highly contaminated areas. In addition, data obtained from specimens collected off the coast of Fukushima from April to December 2012 suggested that the probability of catching fat greenlings with a concentration greater than 16,000 Bq/kg-wet of 137 Cs was exceedingly low (less than 2.794 × 10 −6 ). In contrast, highly contaminated fat greenlings were frequently caught within the FNPP port. The geometric mean of 137 Cs was 55,400 Bq/kg-wet, as calculated from specimens obtained during December 2012 to May 2013. Our investigation suggests that fat greenlings with an extremely high concentration of radiocesium were contaminated within the FNPP port and then migrated offshore.

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Effects of the nuclear disaster on marine products in Fukushima

Cited by 157 publications

References 18 publications

Radiocesium Concentrations in the Organic Fraction of Sea Sediments

Radiocesium Concentrations in the Organic Fraction of Sea Sediments

Impacts of the Nuclear Power Plant Accident and the Start of Trial Operations in Fukushima Fisheries

Evaluating the Probability of Catching Fat Greenlings (Hexagrammos otakii) Highly Contaminated with Radiocesium off the Coast of Fukushima

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