Journal of the Graduate School of Biosphere Science, Hiroshima University Volume 52
2013-12-25 発行

スズキに捕食された稚アユPlecoglossus altivelis altivelis の由来判別

Sock discrimination for juvenile ayu, Plecoglossus altivelis altivelis from stomach of field-caught Japanese seabass, Lateolabrax japonicas in the Nuta River, Hiroshima Prefecture
Urabe, Atsushi
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abstract
Stock discrimination study for juvenile ayu, Plecoglossus altivelis altivelis from stomach of Japanese seabass, Lateolabrax japonicus in the Nuta River estuary was conducted using prey otolith morphology and Sr/Ca profiling. Out of 7 individuals, 3 individuals identified as hatchery-stock ayu that had crystallized otolith. Based on the Sr/Ca profiling for 4 individuals that have normal otolith, 1 individual was identified as an amohidromous form and 3 individuals were identified as hatchery-stock ayu. The results showed that otolith-based approches could provide insight into stock discrimination for even highly digested ayu that have lost all phenotypic characteristics.
subject
アユ
胃内容物
耳石Sr/Ca比
スズキ
由来判別
ayu
otoltih Sr/Ca ratio
seabass
stock discrimination
stomach content