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ID 39902
file
title alternative
Sock discrimination for juvenile ayu, Plecoglossus altivelis altivelis from stomach of field-caught Japanese seabass, Lateolabrax japonicas in the Nuta River, Hiroshima Prefecture
creator
Urabe, Atsushi
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
NDC
Zoology
abstract
広島県沼田川下流域でスズキに捕食された稚アユの由来判別を,耳石結晶化および耳石Sr/Ca比を指標に行った。稚アユ7個体のうち,3個体は耳石の結晶化が認められたことから人工放流種苗とした。正常な耳石を有していた4個体の耳石Sr/Ca比分析を行ったところ,3個体が人工放流種苗で,天然遡上は1個体となった。結局,稚アユ7個体の由来は,天然遡上が1個体で,6個体は放流された人工放流種苗と考えられた。耳石形状やSr/Ca比分析は,外敵に捕食された稚アユの由来判別に有効であると考えられた。
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.
journal title
Journal of the Graduate School of Biosphere Science, Hiroshima University
volume
Volume 52
start page
9
end page
14
date of issued
2013-12-25
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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