このエントリーをはてなブックマークに追加
ID 36752
file
title alternative
Recent Population Trends of Small-Scale Sillago in Western Seto Inland Sea, Japan (2011-2013). <Article>
creator
Shigeta, Toshihiro
Tezuka, Naoaki
Nakagawa, Norihisa
subject
アオギス
キス科
絶滅危惧種
中津干潟
Sillago parvisquamis
endangered species
Nakatsu tidal flat
Sillaginidae
small-scale sillago
NDC
Zoology
abstract
キス科の絶滅危惧種アオギス Sillago parvisquamis について,最大の生息地である瀬戸内海周防灘南部(豊前海)の大分県中津干潟において2011~2013年に調査を実施し,本種の最新の生息状況や年齢構成などを明らかにした。同干潟では2011年級の卓越が認められ,釣りCPUE(個体数/3時間/人)は,2012年6月では7.4(n=13)の高値を示した。2011年級の卓越は豊前海の各生息地で認められ,同海域全体で共通した現象であった。一方,周防灘北部や伊予灘の生息地では2011 年級の卓越は認められず,2011年級の卓越は豊前海に限定した現象であることが明らかになった。
abstract
Small-scale sillago, Sillago parvisquamis (family Sillaginidae), is recognized as an endangered species in Japan. The only large local population of this species is found on the Nakatsu tidal flat in southern Suo-nada Sea (that is the Buzen-kai Sea) in the Seto Inland Sea, Japan. The population structure on the Nakatsu tidal flat was investigated in 2011-2013 to clarify recent population trends. It was found that 2011 constituted the dominant year class. The catch per unit effort (number of caught fish/3 hours/person) by rod-and-line fishing in June 2012 showed a high value of 7.4 (n=13) for the spawning season. This dominant year class was evident at all sampling stations in the Buzen-kai Sea. However, the same year class was not observed in the northern part of the Suo-nada Sea and adjacent waters. These results thus indicate that the dominance of the 2011 year class occurred only in the area of the Buzen-kai Sea.
journal title
Bulletin of the Hiroshima University Museum
issue
Issue 6
start page
31
end page
39
date of issued
2014-12-25
publisher
広島大学総合博物館
issn
1884-4243
ncid
language
jpn
nii type
Departmental Bulletin Paper
HU type
Departmental Bulletin Papers
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 2014 広島大学総合博物館 Hiroshima University Museum
department
Hiroshima University Museum
Graduate School of Biosphere Science
他の一覧



Last 12 months's access : ? times
Last 12 months's DL: ? times


This month's access: ? times
This month's DL: ? times