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タイトル: イソギンポの生活史
その他のタイトル: The Life History of the Blenniid Fish, Blennius yatabei JORDAN et SNYDER
著者: 道津, 喜衛 / 森内, 新二
著者(別表記) : Dotsu, Yoshie / Moriuchi, Shinji
発行日: 1980年 8月
出版者: 長崎大学水産学部
引用: 長崎大学水産学部研究報告, v.49, pp.17-24; 1980
抄録: The blenniid fish, Blennius yatabei JORDAN et SNYDER is distributed in the centoral and southern Japan and in the southern Korea. The fish is generally considered to inhabit tide pools and among stones lying in tidal zone, while the authors often collected them from various kinds of substances such as "Rens" of the oyster farm, net sacks stuffed with the oyster shell and a bouy which were hung and submerged in coastal waters of Nagasaki and Kumamoto Prefectures in the western Kyushu. The fish grows to a maximum size of 9cm in total length, and it seems to be mature in two years. It is omnivorous, feeding mainly on attached diatoms, algae as well as serpulid worms, barnacles, amphipods and other tiny animals. Sex dimorphisms of the fish appear in the crest and the anal fin. Four egg masses of the fish were collected in Nomo Bay near Nagasaki City on June 16 and 18, 1974. The eggs were laid on inner surface of empty shells of the oyster, Crassostrea gigas, which were stuffed in net sacks and hung from a raft and submerged at from one to three meter depth. Each egg mass was guarded by the male parent. Numbers of eggs in each of two egg masses were enumerated as about 450 and about 1,200, respectively. A pair of mature fish collected from empty oyster shell at the spawning ground on June 16, 1974 were kept in a table aquarium and spawned in a nest of oyster shell set in the aquarium three days after capture. The eggs were spherical but somewhat flattened in shape and ranged from 0.58 to 0.65mm in longer axis and from 0.40 to 0.45mm in shorter axis. Each egg was provided with an adhesive pedestal. Hatching took place in nine days after morula stage at the water temperature varying from 23.8 to 25.2℃. Melanophores appearing on the yolk remarkably changed in form during the embryonic development. The newly hatched larvae, having 34 or 35 sometes, were from 2.6 to 2.9mm in total length before fixation. The larvae were kept and reared in a 30-liter plastic vessel at the water temperature varying from 25 to 30℃. They were first fed with planktonic larvae of the oyster, Crassostrea gigas and then with the rotifer, Brachionus plicatilis and the splash copepod, Tigriopus japonicus as they grew larger. The larvae spent a pelagic life for about 30 days and entered in a benthic life at a over 13mm juvenecent stage. One of reared larvae grew to a 21.0mm young in 62 days. The examination of larvae and juveniles occurring in plankton samples collected from coastal and off shore waters of Nagasaki Prefecture, Kyushu suggests that the larvae hatch out near shore in spring and summer and disperse to coastal and off shore waters. They spend the pelagic life at the surface water and accampany to floating algae there. When they grow to juveniles of about 13mm TL they come back again to near sea shore and there enter in the benthic life in summer and autumn.
URI: http://hdl.handle.net/10069/30544
ISSN: 05471427
資料タイプ: Departmental Bulletin Paper
原稿種類: publisher

引用URI : http://hdl.handle.net/10069/30544



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