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Title: Seasonal profiles of brain and pituitary GnRH and plasma LH in relation to sex change of protandrous black porgy
Authors: Jin-Lien Du;Yan-Horn Lee;Wen-Shiun Yueh;Ching-Fong Chang
Contributors: 國立臺灣海洋大學:水產養殖學系
Date: 2004-12
Issue Date: 2016-08-24T08:11:50Z
Publisher: The Society for the Study of Reproduction
Abstract: Abstract: Three molecular variants of GnRH in the brain (sbGnRH, sGnRH and cGnRH-II) and two forms in the pituitary (sbGnRH and sGnRH) were detected in protandrous black porgy, Acanthopagrus schlegeli using chromatographic and immunological methods. In juvenile fish, brain sbGnRH, sGnRH and cGnRH-II levels increased from May, and reached the highest levels in Jul-Aug (non-spawning) and Jan-Mar (spawning season). In 1+ -year-old fish, high levels of brain sbGnRH and sGnRH were detected in Sep, Nov and Feb-Mar but the levels of brain cGnRH-II remained constant. Gradual increase in pituitary sbGnRH was detected in the juvenile fish from Jul to Mar. In 1+ -year-old fish, the levels of pituitary sbGnRH were high in Sep and Mar-May but low in Jan-Feb. A close correlation between pituitary sbGnRH and plasma LH levels was found in juvenile and 1+ -year-old fish. In 2+ -year-old fish, significantly lower levels of plasma LH was detected during the non-spawning period in sex-changing fish compared to the fish that remained as males. Higher plasma LH levels were detected in the sex changing fish from “artificially sex reversed female” to “male”. FSH receptor and LH receptor transcripts were higher in the bisexual testicular tissue than in the ovarian tissue in 2+ -year-old fish. Direct effects of hCG on sex change were studied and the results showed that exogenous hCG did not stimulate gonadal aromatase activity in 2+ -year-old fish. Therefore, it is suggested that high and basal levels of plasma LH during the non-spawning season correlate with the development of male and female gonad, respectively, in black porgy. The important role of the neuroendocrine system in sex change (for male direction) is proposed in hermaphroditic fish.
URI: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/38308
Appears in Collections:[水產養殖學系] 期刊論文

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