耳石安定同位体比分析と文献調査に基づく日本におけるニホンウナギの自然分布域  [in Japanese] Distribution of naturally recruited wild Japanese eels in Japan revealed by otolith stable isotopic ratios and document investigation  [in Japanese]

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Author(s)

    • 米田 彬史 YONETA AKIHITO
    • 東京大学大学院農学生命科学研究科|東京大学大気海洋研究所 Graduate School of Agricultural and Life Sciences, The University of Tokyo|Atmosphere and Ocean Research Institute, The University of Tokyo
    • 荒井 考磨 ARAI KOHMA
    • 東京大学大気海洋研究所|東京大学大学院新領域創成科学研究科 Atmosphere and Ocean Research Institute, The University of Tokyo|Graduate School of Frontier Sciences, The University of Tokyo
    • 三宅 陽一 MIYAKE YOICHI
    • 東京大学大気海洋研究所|東京大学大学院新領域創成科学研究科 Atmosphere and Ocean Research Institute, The University of Tokyo|Graduate School of Frontier Sciences, The University of Tokyo
    • 木村 伸吾 KIMURA SHINGO
    • 東京大学大気海洋研究所|東京大学大学院新領域創成科学研究科 Atmosphere and Ocean Research Institute, The University of Tokyo|Graduate School of Frontier Sciences, The University of Tokyo

Abstract

<p> 日本におけるニホンウナギの自然分布域を明らかにするために,文献調査からシラスウナギの来遊記録をまとめ,耳石安定同位体比分析に基づく判別手法から全国の河川・湖沼から収集した個体を天然加入個体と放流個体に判別した。その結果,九州一帯,瀬戸内海沿岸,青森県以南の太平洋沿岸,京都府以南の日本海沿岸は自然分布域の主要部,福井県から青森県までの日本海沿岸は自然分布域の縁辺部と推定された。しかし,主要部であっても天然加入個体の割合が3割程度以下の場合もあり,資源が放流個体に依存している状況がうかがえた。</p>

<p> To clarify the natural distribution of Japanese eels in Japan, otolith oxygen and carbon stable isotope analyses were conducted by analyzing collections of data on Japanese eels in scientific archives. The stable isotope analyses can segregate naturally recruited eels from stocked eels. As a result, coastal regions of the whole area of Kyushu, the Seto Inland Sea, the Pacific side south of Aomori Prefecture, and the Sea of Japan side south of Kyoto Prefecture were identified as main areas of natural distribution, and coastal regions from Fukui Prefecture to Aomori Prefecture facing the Sea of Japan were identified as marginal areas of natural distribution. Even in the main area, some rates of naturally recruited eels were less than 30%, suggesting that the eel resources inhabiting Japanese rivers and lakes are dependent on stocked eels.</p>

Journal

  • NIPPON SUISAN GAKKAISHI

    NIPPON SUISAN GAKKAISHI 85(2), 150-161, 2019

    The Japanese Society of Fisheries Science

Codes

  • NII Article ID (NAID)
    130007622909
  • NII NACSIS-CAT ID (NCID)
    AN00193422
  • Text Lang
    JPN
  • ISSN
    0021-5392
  • NDL Article ID
    029617884
  • NDL Call No.
    Z18-345
  • Data Source
    NDL  J-STAGE 
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