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ニクハゼの生態・生活史およびホルモン処置による採卵


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Title: ニクハゼの生態・生活史およびホルモン処置による採卵
Other Titles: The Biology and Induced Spawning of the Gobiid Fish, Chaenogobius heptacanthus
Authors: 道津, 喜衛
Authors (alternative): Dotsu, Yoshie
Issue Date: Feb-1984
Publisher: 長崎大学水産学部
Citation: 長崎大学水産学部研究報告, v.55, pp.9-18; 1984
Abstract: The sevenspine goby. Chaenogobius heptacanthus (Hilgendorf) is distributed in the Middle and Southern Japan and Southern Korea. The fish inhabits the shallow waters of bay, particulary it is abundant in eel grass, Zostera beds and lives a free swimming life in aggregation, and moves slowly. The goby feeds on tiny planktonic animals such as copepods and crustacean larvae. The female fish, averaging 48 mm BL, grows bigger than the males, 42 mm BL. During the spawning season, which extends from Feburary to May in Kyhshu, the female fish is decorated with bright nuptial colors. The life span of the fish is about one year. The spawning behavior in the wild is unknown. Four pairs out of 9 pairs of fish treated by gonadotrophic hormones spawned fertilized eggs. The hormones used were dryed pituitaries of the bull frog and the medicine, Synahorin. The former were planted in dorsopectoral muscle of the fish and the latter was injected in the same place. After the hormone operation, each pair of the treated fish were enclosed with net in an earthenware pipe and setttled in aquaria provided with a circulatory system of sea water. During 2~14 days after the last operation. the fish deposited fertilized eggs on the inner wall of the pipe, but the eggs were not in good quality. The egg is demersal one with adhesive threads. It is ellipsoid in shape, about 3.0 mm in long axis and about 1.1 mm in short axis. A 4.6 mm larva hatched out about 11 days after spawning at the water temperature 10~15℃, but it came out before complete development. The post larvae ranging from 10 to 27 mm TL., were collected by boat seine net all over Hakata Bay, Kyushu during April to June. The young fish came to the habitat near shore after the larval life in bay.
URI: http://hdl.handle.net/10069/30412
ISSN: 05471427
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:第55号

Citable URI : http://hdl.handle.net/10069/30412

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