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ミサキスジハゼの生活史


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Title: ミサキスジハゼの生活史
Other Titles: The Life History of the Gobiid Fish, Zonogobius boreus
Authors: 塩垣, 優 / 道津, 喜衛
Authors (alternative): Shiogaki, Masaru / Dotsu, Yoshie
Issue Date: Aug-1974
Publisher: 長崎大学水産学部
Citation: 長崎大学水産学部研究報告, v.37, pp.1-8; 1974
Abstract: Zonogobius boreus Snyder is a small gobiid fish provided with developed fins. It is reddish brown in color and it grows to about 35 mm. in full grown size (Fig. 1). The specimens were collected from tide pools on open rocky shore, washed by Kuroshio and Tsushima Warm Current in the middle and southern parts of Japan, but only a small numbers. In tide pools, the fish were hiding themselves in crevices of rock and among stones and fed mainly on tiny crustaceans. One male adult, being 37.9 mm. in total length, and 4 female adults, being from 31.3 to 37.0 mm., were collected alive from tide pools on rocky shore of Nomozaki (Lat. 32° 35.3' N, Long. 129° 45.5' E) near Nagasaki City and kept in a table aquarium provided with a recirculatory system for spawning experiment during March 1971 to February 1972. Two Pecten shells and many stones were laid on the sand bottom of the aquarium for nesting, but the fish selected only the Pecten shells for their nests (Fig. 2). Twelve spawnings occurred during June 15 to October 30, 1971 as shown in Table 1. It shows a polyspawning habit in both sexes. In every spawning, the egg mass was attached to the inner wall of the Pecten nest and always guarded by the male parent with its body in an upside down position. The egg of ellipsoid measured from 1.20 to 1.45 mm. in long axis and from 0.51 to 0.55 mm. in short axis and equipped with a bundle of adhesive filaments at the basal end of the egg (Fig. 3). The incubation period was considerably long taking more than 110 hours at the temperature ranging from 21° to 23° C. The embryo changed its direction of the head from the basal side to the tip side during the course of embryonic development. The newly hatched larvae were elongate in form ranging from 2.07 to 2.52 mm. in total length and consumed their yolks in 2 days after hatching (Fig. 3, I, J). A light yellowish 7 mm-long juvenile in preserved conditions, which was supposed to have just finished its planktonic life in the open sea, was collected from a tide pool (Fig. 4, A). It has already developed the united ventral fins wanting velum (Fig. 4, V1). A 8.0 mm. specimen, early young stage which possessed the blackish brown bands on the body, has a united ventral fins slightly notched at the posterior margin similar to that of the adult (Fig. 4, B, V2).
URI: http://hdl.handle.net/10069/30823
ISSN: 05471427
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:第37号

Citable URI : http://hdl.handle.net/10069/30823

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