九州の一渓流におけるアマゴ浮上稚魚の流程分布

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  • 木本 圭輔
    大分県農林水産研究指導センター水産研究部 広島大学大学院生物圏科学研究科
  • 景平 真明
    大分県農林水産研究指導センター水産研究部
  • 畔地 和久
    大分県農林水産研究指導センター水産研究部　浅海・内水面グループ　浅海チーム
  • 福田 祐一
    大分県農林水産研究指導センター水産研究部　浅海・内水面グループ　内水面チーム
  • 長澤 和也
    広島大学大学院生物圏科学研究科

書誌事項

タイトル別名
  • Longitudinal distribution of newly emerged fry of amago salmon (<i>Oncorhynchus masou ishikawae</i>) in a mountain stream, Kyushu, southern Japan
  • キュウシュウ ノ イチ ケイリュウ ニ オケル アマゴ フジョウ チギョ ノ リュウ テイ ブンプ

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抄録

The longitudinal distribution of newly emerged fry and post-fry of amago salmon (Oncorhynchus masou ishikawae) was investigated by snorkeling in 14 consecutive sections (totaling 16.4 km in length) of the Ogata River and its tributary, the Kohbaru Stream, Oita Prefecture, one of the waterways in northeastern Kyushu Island, southern Japan, in which are found the southernmost landlocked populations of amago salmon. In two surveys, conducted at intervals of 11–32 days from January to April 2005, the densities of newly emerged fry were greatest in the four most upstream sections but remained very low in the six most downstream sections, the skewed distribution being stable. The densities of post-fry individuals were also greatest in the four most upstream sections, showing significant seasonal correlations (October 2003, February and August 2004). Furthermore, the density of newly emerged fry from January to April 2005 was significantly correlated with that of post-fry individuals in August 2004. On the bases of this and earlier reports, it was concluded that amago salmon fry in mountain streams of Kyushu Island stay near the spawning redd, at least until they attain the parr stage.

収録刊行物

  • 魚類学雑誌

    魚類学雑誌 60 (1), 15-26, 2013

    一般社団法人 日本魚類学会

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