Journal of the Graduate School of Biosphere Science, Hiroshima University Volume 54
2015-12-25 発行

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
Tsuyuki, Atsushi
Okazaki, Ryuma
Takeshita, Kuniaki
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abstract
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.
subject
太田川
回遊履歴
カジカ中卵型
耳石Sr:Ca比
Cottus sp. (middle-egg type)
Migratory history
Ota River
Sr:Ca ratio