【摘要】 用芳香化酶抑制剂 (Fadrozole)、雌激素受体拮抗剂 (Tamoxifen)对人工孵化的南方鲶 (Silurusmeridionalis)幼鱼进行雄性化诱导处理 (口服 ) ,获得雄鱼。对孵化后第 5～ 1 3 0d的南方鲶幼鱼性腺进行组织学观察 ,结果表明 ,在实验条件下 ,南方鲶性腺分化发生在孵化后 7d左右 ,雌雄性分化过程差异明显。雌鱼卵巢腔在孵化后 1 2d左右形成 ,生殖细胞在孵化后 3 5d左右快速增殖 ,成熟分裂最早发生在孵化后 5 5d左右 ;雄鱼生殖细胞在孵化后 1 3 0d左右快速增殖 ,成熟分裂最早发生在孵化后 1 3 0d左右。雌性性腺分化早于雄性。更多还原

【Abstract】 To obtain male fish, fry of southern catfish (Silurus meridionalis) obtained by artificial fertilization and hatching were treated by oral administration of an aromatase inhibitor (Fadrozole) and an estrogen receptor antagonist (Tamoxifen). During 5-130?days after hatching (dah), gonads of fish in treated group and in control group were collected for histological observation. It was indicated that the sexual differentiation of southern catfish took place at around 7?dah. Several obvious differences between female and male were observed during the gonadal sex differentiation. In female, the ovarian cavity was formed at about 12 dah. The germ cells proliferated rapidly at about 35 dah. Meiosis of germ cell took place at about 55 dah. Whereas in male fish germ cells proliferated rapidly only after 130 dah. Meiosis of the germ cell took place at the same time. The gonadal differentiation in females occurred much earlier than that in males.更多还原