First record on the occurrence and spawning of Shokihaze goby, Tridentiger barbatus (family: Gobiidae), based on a specimen from Yamaguchi Bay in western Seto Inland Sea, Japan

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  • 瀬戸内海山口湾で採集された準絶滅危惧種ショウキハゼTridentiger barbatus(ハゼ科)の生息と産卵の確認
  • セトナイカイ ヤマグチワン デ サイシュウ サレタ ジュンゼツメツ キグシュ ショウキハゼ Tridentiger barbatus(ハゼカ)ノ セイソク ト サン タマゴ ノ カクニン

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Abstract

A specimen of Shokihaze goby, Tridentiger barbatus, was collected from Yamaguchi Bay, western Seto Inland Sea, Japan in June 2012. This species has been evaluated as a near threatened species in Japan. This specimen was an adult female of 110.1mm TL and 89.4mm SL. The gonadosomatic index was 1.59%. Histologically the most developed stage of normal oocytes was the secondary yolk globule stage. The specimen had a lot of new postovulatory follicles in the ovarian lamella and a few ovulated ripe oocytes remained in the ovarian cavity. Therefore, these results indicate that spawning has occurred and this species is a multiple spawner. This is the first report of the occurrence and spawning of T. barbatus, based on a specimens from Yamaguchi Bay.

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