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本文研究了不同性腺发育时期淡水饲养的雌雄虹鳟（Oncorhynchus mykiss)血浆促性腺激素（GTH）浓度的变化规律；以及在离体条件下，了促性腺激素释放激素（GnRH)、GnRH拮抗物和多巴胺对虹鳟脑垂体细胞分泌促性腺激素（GTH－Ⅱ）的影响，结果表明：（1）在雄性，血浆中GTH－Ⅱ的水平随性腺发育而逐渐增高；在雌性，仅排卵期血浆中GTH－Ⅱ的水平明显增高。（2）未成熟期和成熟期的雌性虹鳟脑垂体细胞对sGnRH和cGnRH刺激的敏感性表现不尽相同，成熟期和排卵后的脑垂体细胞对GnRH的刺激较为敏感，GTH－Ⅱ的分泌量较多。（3）在没有sGnRH的条件下，GnRH拮抗物对GTH－Ⅱ的分泌不发生作用，而在sGnRH的存在下，GnRH拮抗物对GTH－Ⅱ的分泌表现出浓度依赖的抑制作用。（4）在没有sGnRH的存在下，多巴胺对GTH－Ⅱ的分泌不发生作用，而当多巴胺的浓度一定时，随着sGnRH浓度的增加，GTH－Ⅱ分泌的量增大，另外，否认sGnRH还是cGnRH都不同时期的脑垂体细胞GTH－Ⅰ的分泌，这些结果可为虹鳟的人工催产提供一些理论依据。 相似文献
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The profiles of cortisol, testosterone, ll-ketotestosterone and 17α， 20β- dihydroxy-4-pregnene-3-one in mule rainbow trout reared under constant water temperature and natural photoperiod were determined by radioimmunoassay. Gonads of male rainbow trout reached maturity when the fish were two years old. Changes in the plasma levels of both sex steroid hormones and cortisol were closely related to the GSI. Plasma levels of testosterone, 11-ketotestostemne and 17a, 2013-dihydroxy 4-pregnene-3-one showed a clear peak in the annual breeding season, when the GSI reached their maxima. Plasma cortisol levels also showed clearly seasonal changes in both two- and three-year-old fish. The results suggest that the elevated plasma levels of cortisol may not just be due to stresses during the breeding season but have certain physiological functions in the reproduction of rainbow trout. 相似文献
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ＩＮＴＲＯＤＵＣＴＩＯＮＴｈｅｒｅａｒｅａｌｏｔｏｆｐｕｂｌｉｓｈｅｄｐａｐｅｒｓｄｅｓｃｒｉｂｉｎｇｔｈｅａｎｎｕａｌｏｒｓｅａｓｏｎａｌｅｎｄｏｃｒｉｎｅｃｈａｎｇｅｓａｓｓｏｃｉ ａｔｅｄｗｉｔｈｒｅｐｒｏｄｕｃｔｉｖｅａｃｔｉｖｉｔｙｉｎｔｅｌｅｏｓｔｆｉｓｈｅｓ (Ｓｃｏｔｔｅｔａｌ.,1 980 ;Ｌｏｕｅｔａｌ.,1 984 ,1 986;Ｓｕｚｕｋｉｅｔａｌ.,1 997;Ｈｏｕ 1 998;Ｙａｒｏｎｅｔａｌ.,1 986) ,ａｎｄｅｖｉｄｅｎｃｅｔｈａｔｔｈｅｇｏｎａｄａｌｍａｔｕｒａｔｉｏｎｏｆｓａｌｍｏ ｎｉｄｆｉｓｈｗ… 相似文献
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