Genetic structure of the amago and iwame forms of the red-spotted masu salmon <I>Oncorhynchus masou ishikawae</I> in the upper Ono River, northeastern Kyushu, southern Japan

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  • Kimoto Keisuke
    Fisheries Research Division, Oita Prefectural Agriculture, Forestry and Fisheries Research Center Laboratory of Aquaculture, Graduate School of Biosphere Science, Hiroshima University
  • Mekata Tohru
    Aquatic Animal Health Division, National Research Institute of Aquaculture, Fisheries Research Agency
  • Takahashi Hiroshi
    National Fisheries University
  • Nagasawa Kazuya
    Laboratory of Aquaculture, Graduate School of Biosphere Science, Hiroshima University

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Other Title
  • 九州北東部の大野川上流域におけるアマゴとイワメの遺伝的構造
  • Genetic structure of the amago and iwame forms of the red-spotted masu salmon Oncorhynchus masou ishikawae in the upper Ono River, northeastern Kyushu, southern Japan

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Abstract

The genetic structure of two fluvial forms of the red-spotted masu salmon, amago (ordinary form) and iwame (markless form), collected from two headwater streams, the Kohbaru Stream and the Hakiai Stream, of the Ono River, Oita Prefecture, was examined using mtDNA to identify whether they were indigenous to the streams. The Hakiai Stream consists of two tributaries, Mennotsura-dani and Manryo-dani. The iwame population occurs only in Mennotsura-dani, and since 1970, fishing has been prohibited for the iwame and amago populations in most locations of Mennotsura-dani and Manryo-dani, respectively. One haplotype (Hap-1) was shared by three isolated populations examined: it was fixed (100%) in the iwame population from Mennotsura-dani and dominant (90.5%) in the amago population from the upper Kohbaru Stream, but was infrequent (10.0%) in the amago population from Manryo-dani. Hap-1 was also frequent in the samples of amago fry caught in the Kohbaru Stream. Based on these results and the long persistence of the iwame population in Mennotsura-dani, both the iwame population in Mennotsura-dani and the amago population in the upper Kohbaru Stream are considered to be indigenous, whereas the amago population in Manryo-dani appears to have been mostly replaced by hatchery-reared fish informally stocked in the upper location.

Journal

  • Aquaculture Science

    Aquaculture Science 63 (3), 299-309, 2015

    Japanese Society for Aquaculture Science

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