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

津行, 篤士  ,  岡﨑, 隆真  ,  海野, 徹也  ,  竹下, 邦明

54pp.7 - 12 , 2015-12-25 , 広島大学大学院生物圏科学研究科
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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