Body-size Effect and Dynamics of Radiocesium for Wakasagi <i>Hypomesus nipponensis</i>

• SUZUKI Kyuma

  Gunma Prefectural Fisheries Experiment Station

• WATANABE Shun

  Gunma Prefectural Fisheries Experiment Station

• ONOZEKI (YUASA) Yumi

  Gunma Prefectural Fisheries Experiment Station

• ARAI Hajime

  Gunma Prefectural Fisheries Experiment Station

• TANAKA Hideki

  Gunma Prefectural Fisheries Experiment Station

• KUGE Toshihiro

  Gunma Prefectural Fisheries Experiment Station

• TSUNODA Kin-ichi

  Graduate School of Science and Technology, Gunma University

• MORI Masanobu

  Graduate School of Science and Technology, Gunma University

• NOHARA Seiichi

  National Institute for Environmental Studies

• OKADA Yukiko

  Atomic Energy Research Laboratory, Tokyo City University

• MINAI Yoshitaka

  Faculty of Humanities, Musashi University

Bibliographic Information

Other Title

• ワカサギ中の放射性セシウム濃度の体重依存性と経年変化
• ワカサギ チュウ ノ ホウシャセイ セシウム ノウド ノ タイジュウ イソンセイ ト ケイ ネンヘンカ

Abstract

The accident of the Fukushima Dai-ichi Nuclear Power Plant in March, 2011, released large amounts of radiocesium into the atmosphere, and contaminated the environment of Gunma Prefecture in eastern Japan. In particular, 640 Bq kg^–1-wet of radiocesium concentration was found in wakasagi (Hypomesus nipponensis) in Lake Onuma on Mt. Akagi in August, 2011. Thus, to elucidate the body-size effect in weight-dependent and dynamics of radiocesium in the ecosystem of Lake Onuma, we determined the age of wakasagi, the body-weight class of the radiocesium concentration in wakasagi and the effective ecological half-life (T_eff) of radiocesium in wakasagi 0+ from 2012 to 2016. The body-size effect was found for the ¹³⁷Cs concentration of wakasagi fished from 2012 to 2015, i.e., the concentration of ¹³⁷Cs increased with the increase in its body weight. On the other hand, no body size effect was found in 2016. This result may be caused by the following two factors: the ¹³⁷Cs concentration of the lake water reached a steady state after May 2014; wakasagi is a small plankton-feeding fish, while it is known that larger piscivorous fishes show the strong body size effect. T_eff of the ¹³⁷Cs concentration in wakasagi 0+ consists of two components, fast- and slow-term ones, and the decay rate of the ¹³⁷Cs concentration in wakasagi 0+ was greatly reduced. As stated above, the radiocesium contamination in Lake Onuma has still been lasting; we are thus continuing our monitoring studies.

Journal

• BUNSEKI KAGAKU

  BUNSEKI KAGAKU 66 (3), 195-200, 2017

  The Japan Society for Analytical Chemistry

Keywords

• wakasagi
• radiocesium
• body size effect
• effective ecological half-life

Details

• CRID: 1390001204662492672
• NII Article ID: 130005558184
• NII Book ID: AN00222633
• DOI: 10.2116/bunsekikagaku.66.195
• NDL BIB ID: 028054912
• ISSN: 05251931
• Web Site: https://ndlsearch.ndl.go.jp/books/R000000004-I028054912
• Web Site: https://www.jstage.jst.go.jp/article/bunsekikagaku/66/3/66_195/_pdf
• Text Lang: ja
• Data Source:
  • JaLC
  • NDL
  • Crossref
  • CiNii Articles
  • KAKEN
• Abstract License Flag: Disallowed