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ID 30186
file
title alternative
Landlocked Ayu, Plecoglossus altivelis (Teleostei: Plecoglossidae) in the Ashida River, Hiroshima Prefecture, as Identified by Otolith Sr/Ca Ratio
creator
Shiba, Tomohisa
Kenzaki, Hitomi
Shibata, Yasuhiro
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
NDC
Zoology
abstract
広島県芦田川中流・上流域で捕獲したアユ成魚10個体の耳石Sr/Ca比を調べ由来判別を行った。その結果, 9個体の耳石Sr/Ca比に変動がなく, 終始低レベルに推移したため, それらは仔稚魚期に海洋生活を送らなかった陸封アユと判断された。これら陸封アユは, 芦田川に建設された八田原ダムや三川ダムによって形成された人造湖(芦田湖, 神農湖)で再生産したものと考えられた。
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.
journal title
Journal of the Graduate School of Biosphere Science, Hiroshima University
volume
Volume 46
start page
35
end page
42
date of issued
2007-12-20
publisher
広島大学大学院生物圏科学研究科
issn
1348-1371
ncid
SelfDOI
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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