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Changes in the levels of the three native forms of GnRH during pubertal development in striped bass, Morone saxatilis
Holland, M.C.; Hassin, S.; Zohar, Y. (2000). Changes in the levels of the three native forms of GnRH during pubertal development in striped bass, Morone saxatilis, in: Norberg, B. et al. (Ed.) Proceedings of the 6th International Symposium on the Reproductive Physiology of Fish, Bergen, Norway, July 4-9, 1999. pp. 56-58
In: Norberg, B. et al. (Ed.) (2000). Proceedings of the 6th International Symposium on the Reproductive Physiology of Fish, Bergen, Norway, July 4-9, 1999. Department of Fisheries and Marine Biology, University of Bergen: Bergen. ISBN 82-7461-048-2. 499 pp., more
In: International Symposium on the Reproductive Physiology of Fish. Museo Nacional de Ciencias Naturales, more

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    VLIZ: Proceedings [4120]

Keyword
    Marine

Authors  Top 
  • Holland, M.C.
  • Hassin, S.
  • Zohar, Y.

Abstract
    In the present study, we investigated the respective relationships between the three native GnRH forms and pubertal development in striped bass(Morone saxatilis). Seabream (sb) GnRH was the dominant GnRH form in the pituitary, followed by chicken (c) GnRH-II and salmon (s) GnRH. Puberty was initiated in most females during the third year of life and the levels of sbGnRH and cGnRH-II increased concomitantly to the increases in oocyte diameter. However, the pituitary levels of all three GnRH forms showed also seasonal fluctuations during the first two years of life, when all females were still immature. In maturing two-year-old males, elevations in the pituitary levels of sbGnRH and cGnRH-II coincided with increases in GSI. However, juvenile males displayed an increase in pituitary sbGnRH and cGnRH-II levels similar to that of precocious males. Taken together these findings suggest that 1) both sbGnRH and cGnRH-II may be involved in the regulation of gonadal development, and 2) the onset of puberty is probably not limited by an insufficient production or release of GnRH in this species.

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