Synchronization of Plasma Sexual Steroid Concentrations and Gonadal Cycles in the Sleeper, Eleotris Acanthopoma

塘鱧血漿性腺類固醇濃度與生殖週期之同步性

王弘毅(Hurng-Yi Wang) ； 翁慶豐(Ching-Feng Weng) ； 杜銘章(Ming-Chung Tu) ； 李信徹(Sin-Che Lee)

《Zoological Studies》 40卷1期 (2001/01) Pp. 14-20

摘要

本文描述環境因子對高屏溪河口塘鱧的生殖週期之可能影響。超過一年期以光學顯微鏡研究魚體生殖腺之形態，並以酵素免疫分析血清雌二醇和睪固酮。在雄性塘鱧血清睪固酮濃度顯示了單一週期的變化，且其高峰在夏天（六月到八月）伴隨著生殖腺體重指數。在雌性，血清雌二醇濃度與生殖腺體重指數在夏天顯著變高。冬天的低溫與短光週期誘發生殖腺的成熟。雌性與雄性塘鱧之血清雌二醇和睪固酮的年變化和生殖腺體重指數相似。這些發現指出低溫與短日照顯然影響塘鱧的生殖週期。

關鍵字

光週期 ； 溫度 ； 年週期 ； 塘鱧 ； 性腺類固醇

並列摘要

This paper describes the possible influences of environmental factors on the reproductive cycle of Eleotris acanthopoma in the Kaoping River estuary. For over 1 yr, gonad gross morphologies of the fish were examined by light microscopy, and plasma 17 beta-estradiol (E2) and testosterone (T) were analyzed by ELISA. In male E. acanthopoma, plasma T concentrations show a single seasonal cycle, with a peak in the summer (June to August) following the profile of the gonadosomatic index (GSI). In females, plasma E2 concentrations are significantly elevated during summer in accordance with the GSI. Low temperatures and a short photoperiod in the winter correlate well with the arrest of gonad maturation. Annual patterns of plasma E2 and T levels are similar to those of GSI changes existing in E. acanthopoma of either sex. These findings indicate that both temperature and photoperiod dominantly affect the reproductive cycle of E. acanthopoma.

並列關鍵字

Photoperiod ； Temperature ； Annual cycle ； Eleotris acanthopoma ； Estradiol (E2) and Testosterone (T)