クボハゼの生態・生活史

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書誌事項

タイトル別名
  • クボハゼ ノ セイタイ セイカツシ
  • The Bionomics and Life History of the Gobioid Fish, Chaenogobius scrobiculatus TAKAGI

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説明

Chaenogobius scrobiculatus TAKAGI is a small gobioid fish, some 40mm in total length, and blackish brown in color. It individually lived a bottom life on sandy mud-bottom of estuary in the localities, Fukuoka City, Tsushima Islands and Goto Islands. It fed omnivrously on small crustacians, shells, organic detritus and algae. The sex-dimorphism slightly developed in the form of genital papilla. The mature female fish is larger than male (Text-Fig. 1). A black nuptial coloration appeared on the dorsal fins, vental fin, anal fin and ventral side of head in ripe femal only as reported on the other gobioid fishes of Genus Chaenogobius and Genus Paleatogobius (Pl. ⅩⅦ, Fig. 1). From the examination of collected ripe female the spawning season seemed to extend from January to April in the estuary of River Kanakuzu, Fukuoka City. The spawning occurred in a part of the estuary where the adult fish always inhabited (Pl. ⅩⅦ, Fig. 2, 3). The fertilized eggs were deposited on the wall of hole of Upogebia major de HAAN. The eggs were deposited 5 cm deep in the vertical hole of the shrimp. The male parent fish stayed in the hole and guared over the eggs. The spawning-ground was situated 100 to 200 metres upstream apart from the spawning-ground of 2 other gobioid fishes, Chaenogobius castanea and Paleatogobius uchidai, which spawned together in same season and in similar manner. The egg is demersal and adhesive one with a large pervitelline space and a bundle of adhesive threads (Text-Fig. 2, A). It is club-shaped, 3.1～3.2mm in long axis and 1.0～1.1mm in short axis with a shallow depression encircling near the tip. It resembles the eggs of 2 other gbioid fishes, C. castanea and P. uchidai in shape. The newly hatched larva is 4.7mm in total length with a few melanophores and 32 segments (Text-Fig. 2, B). The translucent juvenile, about 16mm in total length, entered from its swimming-life to a bottom life in the estuary where the adult fish inhabited (Text-Fig. 2, C～F). This gobioid fish seemed to grow over 27mm in total length and mature in a year.

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