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ID 47296
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Critical Population Trend of the Small-scale Sillago Sillago parvisquamis (family Sillaginidae) at Nakatsu Tidal Flat, Suo-nada Sea, Western Seto Inland Sea, Japan, 2016-2018
creator
Shigeta, Toshihiro
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2016 ~ 2018年の繁殖期に緊急調査を実施し,本種の生息状況や年齢構成などを明らかにした。2016年,2017年,および2018年の釣CPUE(個体数/3 時間/ 人;平均値±標準偏差)は,それぞれ0.80 ± 1.3(n=13),4.3 ± 2.9(n=18),および0.33 ± 0.65(n=9)の低値を示した。依然として,繁殖活動が認められるものの,個体数の減少は著しく,危機的な生息状況にあることが明らかになった。
abstract
The small-scale sillago Sillago parvisquamis (family Sillaginidae) has been evaluated as one of the endangered species in Japan. The only largest local population exists at Nakatsu tidal flat in the southern part of the Suo-nada Sea (Buzen-kai Sea), Seto Inland Sea. The population structure of the species on the tidal flat was investigated in 2016-2018 to determine recent population trends. As a result, no dominant year class was observed in the population. Catch per unit effort (CPUE) (indiv./3 hours/person; mean ± SD) by rod and line fishing during the spawning seasons in 2016, 2017 and 2018 showed low values, at 0.80 ± 1.3 (n = 13), 4.3 ± 2.9 (n = 18) and 0.33 ± 0.65 (n = 9), respectively. Histological examination of ovaries of the females captured in 2018 indicated that spawning had occurred as yet. These findings suggest that the small-scale sillago stock has decreased to a critical level in Japan.
journal title
Bulletin of the Hiroshima University Museum
issue
Issue 10
start page
29
end page
36
date of issued
2018-12-25
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) 2018 広島大学総合博物館 Hiroshima University Museum
department
Hiroshima University Museum
Graduate School of Biosphere Science
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