Utility and safety of hormonal treatment for reverse of the sex in fish.

探讨了激素治疗性逆转的有效方法。性逆转的关键期得到确认。鲤鱼、香鱼、罗非鱼、白鲑鱼和白鲑的性逆转成功。有效激素为雌二醇-17 B和甲基睾酮。前者引起女性化，后者引起男性化。口服类固醇在肝脏和胆囊中蓄积，并在给药后1.5-3小时内排出。因此，在幼虫或幼鱼阶段给药时，作为食物的安全性似乎是足够的。

Effective method for sex reversal by means of hormaonal treatment was investigated. Critical period for sex reversal was confirmed. Sex reversal in carp, ayu, tilapia, pejerrey and coregonus was succeeded. Effective hormones were estradiol-17 B and methyl-testosterone. The former evoked feminization and the later masculinization. Orally administerd steroid was accumulated in the liver and gall bladder and excrined within 1.5-3 hours after administration. Therefore, the safty as the food was seemed to be quite enough when administered during larval or juvenile stage.