鲫鱼卵子发生──Ⅰ．皮层小泡的形成和卵黄发生

OOGENESIS OF CARASSIUS AURATUS ──Ⅰ Cortical Alveoli Formation and Vitellogenesis

鲫鱼卵母细胞的皮层小泡，首先在外周卵质中出泡，然后向内部卵质扩散，接近成熟的卵子中，皮层小泡又重新集中在外周卵质部分，皮层小泡是由液泡体和高尔基复合体产生的囊泡融合而成，鲫鱼卵黄核是由一些致密的无定形物质和纤维网状物质组成。在Ⅲ２期卵母细胞中，观察到卵黄有３种来源（即外源性卵黄，内源性蛋白质卵黄和内源性脂质卵黄）．鲫鱼卵母细胞中的卵黄球大多数是均质的，但有时包含一些电子致密的颗粒。

Conical alveoli of the oocytes of Carassius auratus arc first formed at the peripheralooplasm, then they spread toward the inner ooplasm and finally concentrate in the peripheral ooplasm. Conical alveoli arc formed by the fusion of the vacuolar bodies and vesicles pro duced by Golgi colgi complex.Yolk nucleus of C.auratus is composed of some dense amorphoussubstances and reticular filaments.In stage III oocytes of C.auratus,there are three sources(exogenous yolk,endogenous protein yolk, endogenous lipid yolk).from which yolk is produced. Yolk globules of.C.auratus are homogeneous,sometimes containingelectron-opaque particles.