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ID 39866
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title alternative
Discrimination of amphidromous and landlocked ayu, Plecoglossus altivelis altivelis (Teleostei: Plecoglossidae) in the Nuta River, Hiroshima Prefecture, using the otolith Sr/Ca ratio
creator
Yamamoto, Kanako
Takayama, Sho
Shibata, Yasuhiro
Nakamura, Kazuo
subject
アユ
Sr/Ca比
沼田川
椋梨ダム湖
天然遡上アユ
陸封アユ
ayu
otolith Sr/Ca ratio
amphidromous form
landlocked form
Nuta River
Mukunashi River
NDC
Zoology
abstract
6~8月にかけて主に沼田川中流域で採集したアユ30尾の耳石Sr/Ca比を調べ,由来判別を行った。その結果,30尾中12尾が天然遡上アユであることが判明した。また,支流の椋梨ダム湖(白竜湖)より上流の椋梨川で採集した13尾は,全ての個体で耳石Sr/Ca比の変動が認められなかったことから,これらはダム湖で再生産した陸封アユと考えられた。
abstract
Ayu, Plecoglossus altivelis altivelis, is a commercially important species of amphidromous fish. Thus it is being targeted for stock replenishment to sustain harvest numbers. Stock identification between amphidromous and hatchery fish was conducted using the otolith Sr/Ca concentration ratio on fish taken from the Nuta River in Hiroshima Prefecture, where 170,000 hatchery ayu had been previously released. Of 30 fish sampled from the middle-reaches, 12 were identified as an amphidromous form. Of the 13 fish sampled from the Mukunashi River, a branch of the Nuta River, all were identified as landlocked fish that would have completed their life cycle between the Mukunashi River and the artificial lakes formed by the Mukunashi Dam.
description
本研究は平成19年度広島大学地域貢献研究において,東広島市沼田川漁業協同組合より課題提案された「東広島市沼田川におけるアユの資源保全と有効利用」の一環として行った。
journal title
Journal of the Graduate School of Biosphere Science, Hiroshima University
volume
Volume 47
start page
35
end page
40
date of issued
2008-12-20
publisher
広島大学大学院生物圏科学研究科
issn
1348-1371
ncid
naid
language
jpn
nii type
Departmental Bulletin Paper
HU type
Departmental Bulletin Papers
DCMI type
text
format
application/pdf
text version
publisher
department
Graduate School of Biosphere Science
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