Spatial and seasonal variations of radiocesium concentrations in an algae-grazing annual fish, ayu Plecoglossus altivelis collected from Fukushima Prefecture in 2014

  • Daigo Morishita
  • Toshihiro WadaEmail author
  • Takuji Noda
  • Atsushi Tomiya
  • Masahiro Enomoto
  • Toshiyuki Sato
  • Shunji Suzuki
  • Gyo Kawata
Original Article Environment


To elucidate spatial and seasonal variations of radiocesium (134Cs and 137Cs) concentrations in ayu Plecoglossus altivelis, amphidromous fish samples were collected both from shallow coastal waters in March 2014 and from seven rivers in Fukushima Prefecture during May–October 2014. Of the rivers, two were located within the designated evacuation zone. After standard length (SL) and body weight measurements, fish were dissected to two parts: body without head and internal organs, BD; head and internal organs, HI. Radiocesium concentrations in these parts were measured using germanium semiconductor detectors. Those in the whole body (WB) were reconstructed using their concentrations and weights. The 137Cs concentrations in BD in oceanic samples (4.3–6.7 cm SL) were below the detection limit, whereas those in riverine samples (6.4–18.8 cm SL) were 0.719–902 Bq kg−1-wet. Statistical analyses indicated a best-fit linear mixed-effects model including “SL” and “sampling site” as explanatory variables. Significant differences in 137Cs concentrations in BD among rivers were detected. Our results indicate that 137Cs concentrations in BD of riverine ayu, which showed lower but site-specifically constant values compared with those in HI or WB, are useful as a good indicator of radiocesium contamination of the respective rivers.


Algae-grazing fish Ayu Fukushima Nuclear accident Radiocesium River 



We are grateful to Fukushima Prefecture fishery cooperative members who caught ayu for measurements (Muroharagawa-Takasegawa, Niidagawa-Ohtagawa, Manogawa, Abukumagawa, and Nankaitoubu). Portions of this study were supported by a Grant-in-Aid for Young Scientists (A) (16H06199) from the Ministry of Education, Culture, Sports, Science and Technology, Japan.

Supplementary material

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Supplementary material 1 (XLSX 67 kb)
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Supplementary material 2 (XLSX 34 kb)
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Copyright information

© Japanese Society of Fisheries Science 2018
corrected publication 2019

Authors and Affiliations

  • Daigo Morishita
    • 1
    • 4
  • Toshihiro Wada
    • 2
    Email author
  • Takuji Noda
    • 3
  • Atsushi Tomiya
    • 1
    • 5
  • Masahiro Enomoto
    • 1
    • 6
  • Toshiyuki Sato
    • 1
    • 4
  • Shunji Suzuki
    • 1
    • 4
  • Gyo Kawata
    • 1
    • 6
  1. 1.Fukushima Prefectural Inland Water Fisheries Experimental StationInawashiroJapan
  2. 2.Institute of Environmental Radioactivity, Fukushima UniversityFukushimaJapan
  3. 3.The Institute of Statistical MathematicsTachikawaJapan
  4. 4.Fukushima Prefectural Fisheries and Marine Science Research CentreIwakiJapan
  5. 5.Fishery Office of the Fukushima Prefectural GovernmentIwakiJapan
  6. 6.Fukushima Prefectural Research Institute of Fisheries ResourcesSomaJapan

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