Bulletin of the Hiroshima University Museum Issue 5
2013-12-25 発行

瀬戸内海山口湾における絶滅危惧種アオギスSillago parvisquamis(キス科)の標本に基づく生息と繁殖の確認 <論文>

Report on Distribution and Spawning of Small-scale Sillago, Sillago parvisquamis (family Sillaginidae), Based on Specimens from Yamaguchi Bay in Western Seto Inland Sea, Japan. <Article>
Shigeta, Toshihiro
Usuki, Hironori
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abstract
Small-scale sillago, Sillago parvisquamis, were collected from Yamaguchi Bay, western Seto Inland Sea, Japan. This species has been evaluated as an endangered species in Japan. Eight specimens (sample no. SPYB1-8) collected in 2005-2008 were 226.5-320.1 mm TL, 197.7-281.0 mm SL and were all adult females. The ages of SPYB1-6, 7, and 8 were 1, 3, and 4 years, respectively, and all individuals were of the 2004 class. Judging from ovarian histological samples, the most developed stage of normal oocytes in SPYB1-7 was the tertiary yolk globule stage or the migratory nucleus stage. All individuals had a lot of post-ovulatory follicles. Therefore, these two evidences indicate spawning. The catch per unit effort (CPUE) (indiv. / 3 hours / person) by fishing in 2005-2012 was 0.2 for the spawning season (n=24) and 0.1 for the whole year (n=49). For the 2004 class, CPUE in 2005-2006 was 0.3 for the spawning season (n=14) and 0.2 for the whole year (n=23).

This is the detailed report of the distribution and spawning of Sillago parvisquamis based on specimens from Yamaguchi Bay.
subject
アオギス
キス科
絶滅危惧種
山口湾
Sillago parvisquamis
endangered species
Sillaginidae
Sillago parvisquamis
Small-scale sillago
Yamaguchi Bay
SelfDOI
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