Genetic structure of amphidromous populations of ayu <I>Plecoglossus altivelis altivelis</I> in Kochi Prefecture, Japan

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  • Urabe Atsushi
    Kochi Prefectural Freshwater Fisheries Center Kochi Prefectural Fisheries Experimental Station
  • Nagaiwa Riou
    Kochi Prefectural Freshwater Fisheries Center Fisheries Promotion Division, Fisheries Promotion Department, Kochi Prefectural Government
  • Sumikawa Kazu
    Kochi Prefectural Freshwater Fisheries Center
  • Ishikawa Tetsu
    Kochi Prefectural Freshwater Fisheries Center
  • Okamura Yugo
    Kochi Prefectural Freshwater Fisheries Center
  • Noguchi Daiki
    NIPPON TOTAL SCIENCE, INC.
  • Umino Tetsuya
    Graduate School of Integrated Sciences for Life, Hiroshima University

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Other Title
  • 高知県における天然海産アユの遺伝的集団構造
  • コウチケン ニ オケル テンネン カイサン アユ ノ イデンテキ シュウダン コウゾウ

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Abstract

The genetic diversity and structure of amphidromous populations of ayu Plecoglossus altivelis altivelis (n = 383) from eight rivers in Kochi Prefecture were investigated using microsatellite DNA analysis. The levels of genetic diversity in amphidromous populations in Kochi Prefecture showed that allelic richness and expected heterozygosity ranged from 11.4 to 12.4, and from 0.718 to 0.746, respectively. Using pairwise FST values, we detected significant genetic differentiation between the amphidromous form in Kochi Prefecture and the landlocked form (n = 43) in Lake Biwa, but no significant differentiation among populations of the amphidromous form in Kochi Prefecture. Amphidromous populations in the eight rivers in Kochi Prefecture were grouped as a genetically single regional unit as estimated from pairwise FST, principal component analysis, and an unrooted neighbor-joining tree. These results provide important information to assist with management, conservation, and enhancement of the stock in amphidromous populations of ayu in Kochi Prefecture.

Journal

  • Aquaculture Science

    Aquaculture Science 69 (4), 291-298, 2021

    Japanese Society for Aquaculture Science

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