摘要
用光镜和电镜研究了革胡子鲇（Ｃｌａｒｉａｓｌａｚｅｒａ）原生殖细胞的起源迁移，卵巢在第１次性周期内的分化与发育以及各发育时期卵母细胞的超微结构。原生殖细胞起源于内胚层，有固定的迁移路线，进入生殖嵴后，生殖嵴进一步分化，出现卵巢腔分化成卵巢，卵母细胞在第１次性周期内的发育可分成６个时相，描述了各时相卵母细胞的显微结构与超微结构。同时，叙述了卵母细胞中卵黄发生的形态形成。
In this paper,the differentiation and development of ovary in the first sexcycle and the ultrastructure of different stages of oocytes in Clarias lazera have been studied.PGCs originally appeared in the endoderm of late gastrula,migrated from the endoderm to mesodermal segments and then successively to splanchnic mesoderm, to parietal mesoderm,to dorsal mesentery where PGCs eventually reached the genital ridges.The ovary differentiation happened 66 day' s age.The ovarian development in the first sexcycle has been divided into six stages.It needs about 136 day' s age for the fish to grow to be sexually mature.The ultrastructural feature of oocytes in different stages and the formation of yolk granules have also been discribed.
关键词
革胡子鲇
原生殖细胞
卵巢
发育
Clarias lazera,PGCs-primordial germs cells, Development of ovary,Oocyte, Ultrastructure
