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Neuroendocrine control of gonadotropin II secretion in the Atlantic croaker Micropogonias undulatus): role of gonadal steroids
Khan, I.A.; Thomas, P. (2000). Neuroendocrine control of gonadotropin II secretion in the Atlantic croaker Micropogonias undulatus): role of gonadal steroids, 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. 60
In: Norberg, B. et al. (2000). Proceedings of the 6th International Symposium on the Reproductive Physiology of Fish, Bergen, Norway, July 4-9, 1999. International Symposium on the Reproductive Physiology of Fish, 6. 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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Keyword
    Marine/Coastal
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  • Khan, I.A.
  • Thomas, P.
Abstract
    Testosterone and estradiol stimulate basal- and LHRH analog (LHRHa)-induced gonadotropin II (GTH II or LH) secretion in croaker during early gonadal recrudescence and this influence becomes weaker during the late-recrudescence phase when only a slight stimulatory influence of estradiol on basal GTH II secretion is detected. The influence of the gonadal steroids switches to a negative one on LHRHa-induced GTH II secretion once the fish have fully developed gonads. Plasma levels of the two steroids decline at the end of the reproductive cycle which probably diminishes their inhibitory influence on LHRHa-induced GTH II secretion. The removal of this inhibition presumably enables the ovulatory GTH II surge to occur in response to the neurochemical signals triggered by the appropriate environmental and social cues for spawning.
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