Effect of water temperature on the maturation of the oriental goby Acanthogobius flavimanus

• Published in: Aquaculture Science Vol. 37; no. 4; pp. 267 - 274
• Main Authors: Suzuki, N. (Kajima Inst. of Construction Technology, Hayama, Kanagawa (Japan)), Sakurai, N, Sugihara, T
• Format: Journal Article
• Language: Japanese
• Published: Japanese Society for Aquaculture Science 1989; 日本水産増殖学会
• Subjects: BONY FISHES; BRACKISHWATER FISHES; COLD SEASON; ESPERMATOGENESIS; ESTACION FRIA; MADURACION; MATURATION; OOGENESIS; OVOGENESE; PECES DE AGUA SALOBRE; PECES OSEOS; POISSON D'EAU SAUMATRE; POISSON OSSEUX; SAISON FROIDE; SPERMATOGENESE; SPERMATOGENESIS; TEMPERATURA DEL AGUA; TEMPERATURE DE L'EAU; WATER TEMPERATURE; マハゼ; 成熟条件; 水温; 育種
• ISSN: 0371-4217; 2185-0194
• DOI: 10.11233/aquaculturesci1953.37.267

The underyearling fish of the oriental body Acanthogobius flavimanus in reproduction under laboratory condition grew to a mature size and sexual characters appeared within about a year after artificial insemination. While the fish exhibited an apparent ovarian maturity under such natural condition as water temperature from 14 to 11°C, the subject did not appear under a water temperature of 20°C. To clarify the effect of water temperature on the gonadal maturation of this species, the changes in GSI and gonadal histology of the adult fish caught from the Odawa Bay, in Kanagawa Prefecture were examined for 52 days from November 1987 to January 1988 under the two water temperature conditions. Female fish GSI increased during the period and GSI of the fish in rearing under such natural condition as water from 14 to 11°C reached especially a high value. The ovaries have been occupied with large yolk globule stage oocytes. Under a water temperature condition of 20°C, the oocytes underwent regression. On the other hand, GSI values of males increased during the period and each GSI value in the two water temperature conditions was almost equal. In testicula histology of both conditions, numerous sperms were present in the lumens. These facts suggest that water temperature plays an important role in ovarian maturation of this species.