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ID 30175
file
title alternative
Stock separation for spawning population of ayu at Gouno River using otolith Sr/Ca ratio
creator
Seike, Satoru
Nihongi, Syunji
Nakagawa, Heisuke
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
NDC
Zoology
abstract
島根県江の川において産卵期のアユ42個体の由来判別を耳石Sr/Ca比を用いておこなった。放流実績からすれば江の川水系には天然アユの他,琵琶湖産,人工海産アユが生息している。産卵群42個体の由来を判別した結果,天然アユは13個体,人工海産が26個体となり,湖産アユは皆無であった。したがって,江の川においては湖産アユが海産系アユの産卵行動に関与している可能性は低いと考えられた。
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.
journal title
Journal of the Graduate School of Biosphere Science, Hiroshima University
volume
Volume 41
start page
23
end page
29
date of issued
2002-10-20
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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