分布南限である屋久島におけるアユの現在の生息状況と初期生活史

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タイトル別名
  • Current status and early life history of ayu <i>Plecoglossus altivelis altivelis</i> at the southern limit of their range in Japan
  • ブンプ ナンゲン デ アル ヤクシマ ニ オケル アユ ノ ゲンザイ ノ セイソク ジョウキョウ ト ショキ セイカツシ

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説明

<p>Current status and early life history of amphidromous ayu Plecoglossus altivelis altivelis were studied on Yakushima Island, southern Japan. Although the subspecies had been previously confirmed as distributed in five rivers on the island (Nagata, Isso, Miyanoura, Anbo, and Kurio Rivers), environmental DNA analysis strongly suggested that the population densities were generally low, and that the Anbo River population had disappeared. Spawning of the population in the Kurio River, the southern distribution limit of the subspecies in Japan, occurred in November, primarily around mid-month. Individuals reached 21.3 mm body length 35 days after hatching, the main food items being calanoid copepods. Upstream migrating individuals were observed in early April, suggesting that they remained in estuarine and marine waters for almost four months.</p>

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  • 魚類学雑誌

    魚類学雑誌 69 (2), 225-233, 2022-11-05

    一般社団法人 日本魚類学会

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