アシシロハゼの生態・生活史

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タイトル別名
  • アシシロハゼ ノ セイタイ セイカツシ
  • The Life History and Bionomics of the Gobiid Fish, Aboma lactipes (HILGENDORF)

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Aboma lactipes (HILGENDORF) is a small Gobiid fish, some 60mm in total length. It is distributed on the coasts of Japan throughout, and lives a bottom life in sandy or grvelly littoral and estuarine zones. It feeds on small fishes, crabs, shrimps and organic deposit (Plate XIX, Fig. 2). The sex-dimorphism developed in the form of genital papillae as well as dorsal fins. The nuptial colouration appeared in both sexes (Plate XIX, Fig. 1). The number of the ripe ovarian eggs was enumerated from 707 to 2,273 in six specimens, 40～64mm in total length (Fig. 1; Table 1). The spawning-period seemed to extend from May to August, mainly from May to June, in the vicinity of Fukuoka City, Kyushu. The spawning occurred in the ordinary habitats above mentioned. The one layer egg-mass deposited to under surface of stone lying there (Plate 19, Fig. 2). The male parent gdarded over the egg in the breeding-room constructed under the stone. The number of one egg-mass was enumerated as 442 and 574 in two cases. From the examination of egg-development in the natural spawning-ground, the spawning seemed to occur mainly in the early morning of calm fine day. The egg is club shaped with a shallow depression encircling near the tip. It is adhesive demersal egg with a large perivitelline space and a bundle of adhesive filaments at basal end. The incubation-period was about 150 hours at the temperature 20～25℃ (Fig. 2). The newly hatched larva is 2.85～3.00mm in total length. The 12mm juvenile is compressed laterally and semi-translucent with a few meranophores when alive. It lived a semi-pelagic life in the vicinity of the habitat where the adult lived (Fig. 3). The juvenile, over 13mm in total length, entered already into a bottom life as the adult did. From the examination of the size-frequency of the collected specimens, over 400 individuals, the most of this Gobiid fish seemed to grow to over35 mm in total length and spawn in a year. The life span seems to be over three years.

長崎大学水産学部研究報告, v.8, pp.196-201; 1959

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