Histological Studies on the Oogenesis of Penaeus vannamei

The oogenesis of Penaeus vannamei was studied by using routine histological techniques. According to the size of oocyte,the morphology of nucleolus, the growth of yolk, the appearance of cortical rod and the relationship between oocytes and follicle cells, the oogenesis can be divided into three stages as follows: oogonium, previtellogenic oocyte and vitellogenic oocyte. Moreover,the structure of oocyte at each stage was described in detail.