短盖巨脂鲤卵巢发育组织学研究

HISTOLOGICAL STUDIES ON THE DEVELOPMENT OF OVARY OF COLOSSOMA BRACHYPOMUM

通过对短盖巨脂鲤各个生长时期卵巢组织学研究以及成熟卵超微结构观察，获得短盖巨脂鲤生长发育过程中卵巢发育规律；同时对卵母细胞核仁排出物与核质关系及在卵黄形成中的作用等问题作了初步探讨；并根据卵巢的卵母细胞组成确定了其产卵类型。

The development of the ovary and the electronic microscopy of the structure ofmature ovum of the fish, Colossoma brachypomum Cuvier were studied. The ovary in those fish under two-year old remains at Stage I, and at Stage II for those fish between 2 and 3 years old. The female fish reaches sexual maturity above three years old, During Stages IV, V, VI, the oocytes are mainly in phases 4 and 5 with a few in phases 2 and 3. It is evident that the oocyte development of the fish is continuous and the repreduction of the females may be manipulated artificially many times within a year. The changes in the structure of oocytes during the development were also examined. It is further suggested that C brachypomum belongs to the type ofpoly-spawning fish.