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Morphology, endocrinology, and environmental modulation of gonadal sex differentiation in teleost fishes

Fish Physiology and Biochemistry volume 26, pages 13–29 (2002)Cite this article

Abstract

Successful reproduction by an adult depends on the normal ontogenesis of the gonads, a complex process of cellular and histological differentiation that starts early in life. This process is theoretically predetermined by genetic factors and includes sensitisation of the bipotential gonads to endogenous endocrine factors prior to, during and even after commitment to maleness or femaleness. However, young fish are relatively vulnerable to a host of environmental (physical and chemical) factors that can affect this endogenous endocrine axis, disturbing or even overriding the putative developmental pathway. This sexually lability can be exploited to our advantage for the production of monosex fish populations of the most valuable sex for food production or aquarium fish trade. On the other hand, it represents also a potential path for undesirable influences from endocrine-disrupting chemicals and climatic factors, particularly environmental temperature. This paper provides a detailed account of the early histological process of gonadal sex differentiation, with special reference to gonochoristic species, and reviews the criteria employed to positively identify ovarian and testicular differentiation. It also reviews the development of endocrine competence and sensitivity of the differentiating gonads to exogenous influences in the context of the relative stability of genotypic sex determination in various fish species. Sex differentiation in some species seems to be under strong genetic control and may not require endogenous sex steroid production. Conversely, reliance on endogenous sex steroids for gonadal differentiation is observed in other species and this phenomenon is apparently associated with a higher incidence of environment (mainly temperature)-labile sex differentiation.

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  1. Department of Aquatic Biosciences, Tokyo University of Fisheries, Konan 4-5-7, Minato, Tokyo, 108-8477, Japan (Phone/Fax

    Carlos Augusto Strüssmann

  2. Tropical Biosphere Research Center, University of the Ryukyus, Sesoko Station. 3422 Sesoko, Motobu, Okinawa, 905-0227, Japan

    Masaru Nakamura

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Strüssmann, C.A., Nakamura, M. Morphology, endocrinology, and environmental modulation of gonadal sex differentiation in teleost fishes. Fish Physiology and Biochemistry 26, 13–29 (2002). https://doi.org/10.1023/A:1023343023556

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  • DOI: https://doi.org/10.1023/A:1023343023556

  • environment
  • fish
  • sex determination
  • sex differentiation
  • steroidogenesis

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