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
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.
Sillago parvisquamis
endangered species
Sillago parvisquamis
Small-scale sillago
Yamaguchi Bay
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