A Comprehensive Review of Steroid Hormones in Reproduction and Roles of GnRH-a in Gonadal Maturation of Marine Fish

A Comprehensive Review of Steroid Hormones in Reproduction and Roles of GnRH-a in Gonadal Maturation of Marine Fish

A series of hormones including gonadotropin-releasing hormones (GnRHs), gonadotropins (GTHs) and steroid hormones control the reproduction in teleosts. This literature review discusses the changes in steroid hormone levels in relation to sexual inversion, reproductive behaviour and gonadal growth, as well as the application of GnRH-a to induce marine fish maturation, in order to contribute to a deeper understanding of steroid hormones in reproductive and gonadal maturation. The results revealed that steroid hormones E2, 11-11-KT and DHP are abundantly produced in gonadal tissues under the influence of pituitary gonadotropins in many species of teleost, and are important for crucial gametogenesis measures. As markers for both the sex of the fish and its stage in the seasonal reproductive cycle, plasma steroid levels have been used in particular with regard to spawning induction. Determination of plasma steroid concentrations in relation to sexual identity In the ambisexual fish species, sex inversion. In addition, changes in plasma steroid levels have been clearly defined in many marine species in relation to gonadal growth, number of spawnings, fertility. The analysis also showed that exogenous administration of GnRH-a caused the final maturation of some teleosts of the brood stock. In summary, E2, T, 11-KT and C21 steroids are active in inducing gonadal maturation in some fish species in relation to sex inversion, reproductive processes, and GnRH-a. The findings of various studies have shown that certain steroid hormones such as E2, T, 11-KT and C21 steroids play a significant role in the reproductive process of teleosts. Moreover, GnRH-a is effective in inducing certain fish species to mature.

Author (s) Details

Huynh Minh Sang
Institute of Oceanography, Vietnam Academy of Science and Technology (VAST), 01 Cau Da St., Nha Trang City, Vietnam and Graduate University of Science and Technology, VAST, 18 Hoang Quoc Viet, Hanoi, Vietnam.

Pham Xuan Ky
Institute of Oceanography, Vietnam Academy of Science and Technology (VAST), 01 Cau Da St., Nha Trang City, Vietnam.

Ho Son Lam
Institute of Oceanography, Vietnam Academy of Science and Technology (VAST), 01 Cau Da St., Nha Trang City, Vietnam.

Phan Minh Thu
Institute of Oceanography, Vietnam Academy of Science and Technology (VAST), 01 Cau Da St., Nha Trang City, Vietnam and Graduate University of Science and Technology, VAST, 18 Hoang Quoc Viet, Hanoi, Vietnam.

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