Journal of the Graduate School of Biosphere Science, Hiroshima University Volume 46
2007-12-20 発行

耳石Sr/Ca比による広島県芦田川水系における陸封アユの確認

Landlocked Ayu, Plecoglossus altivelis (Teleostei: Plecoglossidae) in the Ashida River, Hiroshima Prefecture, as Identified by Otolith Sr/Ca Ratio
Shiba, Tomohisa
Kenzaki, Hitomi
Shibata, Yasuhiro
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abstract
Ayu Plecoglossus altivelis is one of the most important freshwater fishes in Japan and usually amphidromous. Stock identification was conducted using otolith Sr/Ca analysis for ayu from the Ashida River, Hiroshima Prefecture. In nine of 10 adults sampled from the upper and middle-reaches in August-October 2006, the ratio did not fluctuate and remained at a low level, indicating that these ayu were landlocked fish without staying as larvae and juveniles in coastal marine waters. The landlocked ayu likely reproduce in two artificial lakes (Lake Ashida and Lake Jin-no formed by Hattabara Dam and Mikawa Dam, respectirely) in the Ashida River.
subject
アユ
耳石Sr/Ca比
陸封
芦田川
人造湖
八田原ダム
三川ダム
ayu
otolith Sr/Ca ratio
landlocked form
Ashida River
dams
artificial lakes
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