Journal of the Graduate School of Biosphere Science, Hiroshima University Volume 41
2002-10-20 発行

耳石Sr/Ca比による江の川アユ産卵群の由来判別

Stock separation for spawning population of ayu at Gouno River using otolith Sr/Ca ratio
Seike, Satoru
Nihongi, Syunji
Nakagawa, Heisuke
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abstract
Stock separation for spawning population of ayu Plecoglossus altivelis in the Gouno River was conducted using otolith Sr/Ca concentration ratio. Based on stock enhancement record, coexistence of amphidromus, hatchery-reared and landlocked ayu can be expected in the spawning population. In case of stock separation in the spawning population carrying out the otolith Sr/Ca ratio, 29 and 13 out of 42 individuals were categorized as the hatchery-reared and amphidromus ayu, respectively. The result of no landlocked ayu in the spawning population suggests that the contribution of the landlocked ayu to spawning and reproduction can be neglected at the Gouno River.
subject
江の川
産卵期
アユ
耳石
Sr/Ca比
放流
Gouno River
spawning
ayu
otolith
Sr/Ca ratio
stocking
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