Journal of the Graduate School of Biosphere Science, Hiroshima University Volume 55
2016-12-25 発行

耳石Sr:Ca比によって推定した利根川産大型ヤマメの回遊履歴

Insight into the migratory history using otolith Sr : Ca ratio of the anadromous masu salmon Oncorhynchus masou masou from the Tonegawa River
Tsuyuki, Atsushi
Sorimachi, Kouken
Arai, Hajime
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abstract
The migratory histories of Oncorhynchus masou masou in the Tonegawa River were evaluated from the ontogenetic changes in otolith Sr:Ca ratios. We sampled 8 fish at 180-243 km upstream from the river mouth. Three fish were categorized as anadromous whereas five individual were categorized as nonanadromous life mode with the constantly low Sr:Ca ratios. Intraspecific variation in the migration modes recorded for O. masou masou suggest a plasticity strategy for anadromous behaviors.
subject
大型ヤマメ
回遊履歴
サクラマス
耳石Sr:Ca比
利根川
Anadromous
Migratory history
Oncorhynchus masou masou
Sr/Ca ratios
Tonegawa River