鲤鱼血清中促性腺激素、17β雌二醇含量的周年变化

应用放射免疫测定法,对雌、雄鲤血清中促性腺激素(GTH)和17β-雌二醇(17β-E_2)的含量进行周年测定。GTH的常年分泌量,雌鲤平均为8.94±5.94ng/ml(12月份含量最低,峰值在1月份);雄鲤常年平均为8.72±5.20ng/ml(10月份含量最低,峰值在11月份)。17β-E_2的含量,雌鲤1-4月份较高,平均为2019.48±754.49pg/ml(全年峰值在2月份)。产卵季节后,卵巢开始退化,17β-E_2含量下降。5—8月平均为454.58pg/ml,产卵前后差异性显著。这表明性腺的发育和成熟与血清中17β-E_2含量变化的密切相关性以及雌二醇对GTH分泌的反馈抑制作用。

ANNUAL CHANGE OF GONADOTROPIN CONTENT AND ESTRADIOL-17 IN THE SERUM OF COMMON CARP

The annual changa of gonadotropin (GTH) a.nd estradiol--17 (E₂) level in the serum of male and female common carp (GyPrinus curpio L) were mea-eared by radioimmunoassy(RIA). The annual average level of GTH in female carp was 8.94 a-5.94 ng/ml, with minimum 1.17+0.76ng/ml in December, and maximum 21.50+11.82 ng/ml in January. The anneal average of GTH level in male carp was 8 .72+5.20ng/mI. minimum 4 .74+2. 81 ng/ml in December and maximum 16.00+7.10 ng/ml in 1lovember. gerund E₂ level in female rises from Janusry to April,the average level is 2019.48+754.49 pg/ml while the peak level is 3215.78 +206.34pg/ml in Feberay. The ovaries regressed soon aftor spawning season and E₂ level significantly decreased to 454.58 pg/ml from May to August. The difference is obvious between prespa..wning rind postspawning seasons (P= 0 .001). These results indicate that the development and maturation of gonads are closely related to the change of serum E₂ Ievel. The feedback effect of E₂ on function of pituitary is also discussed.