The migratory histories of the Cottus sp. (middle-egg type) in the Ota River

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  • 広島県太田川下流域におけるカジカ中卵型 Cottus sp. (middle-egg type)の回遊履歴の推定
  • ヒロシマケン オオタ カワシモ リュウイキ ニ オケル カジカ チュウ タマゴガタ Cottus sp.(middle-egg type)ノ カイユウ リレキ ノ スイテイ

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The migratory histories of Cottus sp. (middle-egg type) were insighted from ontogenetic changes in otolith Sr:Ca ratios. We sampled 25 fish in the upstream and downstream of the Takase Weir in the Ota River. Twenty-four fish were categorized as amphidromous form whereas one individual caught in the upstream, showed landlocked life mode. Intraspecific variations in the migration pattern recorded for Cottus sp. (middle-egg type) suggest a plasticity strategy for diadromous behaviors.

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