Effects of steroid hormones on the sex differentiation in a cichlid fish, Tilapia zillii.
Effects of steroid hormones on the sex differentiation in a cichlid fish, Tilapia zillii.
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类固醇激素对丽鱼科罗非鱼性别分化的影响。
DOI：
10.2331/suisan.44.1093
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发表时间：
1978
影响因子：
0.4
通讯作者：
M. Oguri
中科院分区：
文献类型：
--
作者：
H. Yoshikawa;M. Oguri
本研究探讨了甾体激素对T. zillii。使用的类固醇激素为炔雌醇和甲基睾酮。口服类固醇激素没有引起性逆转。炔雌醇抑制精子发生和性腺向精巢分化。另一方面，甲基睾丸酮对卵子发生的发育和性腺体细胞成分的增殖产生抑制作用。抑制作用的程度依赖于类固醇激素的剂量水平。低剂量的炔雌醇对精子发生有抑制作用，高剂量的炔雌醇对性腺分化有抑制作用。与炔雌醇处理相反，甲基睾酮对性腺分化没有影响。可以假设，未能获得性逆转是由于本研究中使用的类固醇激素剂量水平较高。
The present investigation deals with the effects of steroid hormones on the sex differentiation in T. zillii. Steroid hormones used were ethinylestradiol and methyltestosterone. Oral administration of steroid hormones caused no sex reversals. Ethinylestradiol inhibited the development of spermatogenesis and the differentiation of gonad into testis. On the other hand, methyltestosterone caused an inhibitory effect on the development of oogenesis and a remarkable propagation of somatic elements of gonad. The degree of inhibitory effect was dependent on the dosage level of steroid hormones. In general, lower dosage level of ethinylestradiol caused an inhibitory effect on spermato-genesis, whereas higher dosage on gonadal differentiation. Contrary to the treatment with ethinyl-estradiol, methyltestosterone caused no effects on gonadal differentiation. It may be assumed that the failure to obtain a sex reversal is due to the higher dosage levels of steroid hormones used in the present investigation.