Abstract
During the critical time of sex determination, fish gonads are liable to chemicals and environmental factors that can disrupt the normal course of sex differentiation. This study was conducted to examine the possibility of a combined effect of water temperature and an exogenous steroid hormone (estradiol-17β, E2) on the process of sex differentiation of Japanese medaka (Oryzias latipes) of the d-rR strain. Sex reversal experiments conducted at different temperatures (14, 18, 22, 26, 30, and 34 °C) and E2 concentrations (0, 1 and 10 ppb) showed that the percentage of feminization of genotypic males into phenotypic females decreased with increasing temperature for both E2 concentrations, suggesting a marked synergism between the two factors.
Similar content being viewed by others
References
Iwamatsu, T. 1999. Convenient method for sex reversal in a freshwater teleost, the medaka. J. Exp. Zool. 283: 210–214.
Strüssmann, C.A. and Nakamura, M. 2002. Morphology, endocrinology, and environmental modulation of gonadal sex differentiation in teleost fishes. Fish Physiol. Biochem. 26: 13–29.
Strüssmann, C.A. and Patiño, R. 1995. Temperature manipulation of sex differentiation in fish. In: Proceedings of the Fifth International Symposium on the Reproductive Physiology of Fish (F.W. Goetz and P. Thomas, eds, FishSymp95, Austin, Texas), pp. 153–160.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Minamitani, N., Strüssmann, C. Effect of temperature on the efficiency of feminization of medaka (Oryzias latipes) by hormonal (estradiol) manipulation. Fish Physiology and Biochemistry 28, 163–164 (2003). https://doi.org/10.1023/B:FISH.0000030512.22575.64
Issue Date:
DOI: https://doi.org/10.1023/B:FISH.0000030512.22575.64