摘要
本文介绍了莫桑比克罗非鱼幼鱼性腺的发育和分化的观察结果。用组织学方法观察,莫桑比克罗非鱼幼鱼的性腺发育,可以明显地区分为三个阶段,即:性晚的原始阶段,性腺分化前期阶段,性腺分化完成阶段。 作者认为,对莫桑比克罗非鱼的诱变试验,应在前两阶段进行;当幼鱼体长达到15mm以后,性腺分化已基本完成,性激素的处理不可能取得性诱变的明显效果。
This report describes the development, differentiation and maturation of the gonad in Tilapia mossambica. Through histological studies, mainly there are three stages canbe divided. 1. The newly hatched fry before the yolk sac is absorbed, there are only a fewprimordial germ cells observed at the root of coelomic membrane between themesonephric duct, dorsal aorta and the gut. 2. Sex remains undifferentiated 10 days after hatching,and when the fry attains 9mm in total length, the gonadal anlage usually differentiated into two types. The broadones develop more rapidly, and contain many germ cells, some of which show mitoticphase. The other is small and narrow, which contains only 2 or 3 germ cells without anymitotic phase. 3. At the stage of 30 days after hatching, when the fry attains to 25 mm in totallength, the germ cells of the large gonadal anlage enter into the early oocyte stage andfurther develop to form ovary. While the germ cells of the small gonadal anlage justbegin to enter the mitotic phase, they will develop into testis later. So that the differen-tiation of the testis is about 20 days later than that of the ovary. The ovary and thetestis mature at the stage of 90 days after hatching. For the purpose of sex inducement in Tilapia mossambica, it is suggested that theprocess is better to operate before the fry reaches to the length of 9 mm, and so thesuccess may be more reliable.
出处
《水产学报》
CAS
1980年第4期313-318,共6页
Journal of Fisheries of China
