不同浓度药物与不同天数鱼苗对吉富罗非鱼雌性诱导效果的影响

目的]研究不同浓度药物（苯甲酸雌二醇）与鱼苗天数对吉富罗非鱼雌性诱导效果的影响。方法]将苯甲酸雌二醇设置6个浓度0、80、90、100、110、120μg/g,分别对卵黄囊刚吸收完的第0天、第5天、第10天吉富罗非鱼苗进行雌性诱导1个月,再饲养至体长16cm时,统计雌性率。结果]不同天数鱼苗,在6个浓度药物作用下,组内雌性诱导效果均差异极显著（P〈0.01）。其中第0天鱼苗以120μg/g浓度药物,诱导效果最好,平均雌性率67.24%;第5天、第10天鱼苗分别以100、90μg/g浓度药物,诱导效果最好,平均雌性率为56.58%、24.83%。相同药物浓度下,第0天、第5天、第10天鱼苗间,雌性诱导效果差异极显著（P〈0.01）,其中以第0天诱导率最高。结论]对第0天吉富罗非鱼苗,以浓度为120的药物进行雌性诱导,效果最好。

Effect of Different Concentration Drug and Different Days Fry on Female Sex-reversal of Gift tilapia

Objective] To study the effect of different concentration drug(estradiol benzoate)and different days fry on female sex-reversal of gift tilapia.Method]The fry of 0,5,10 days was feed by estradiol benzoate in concentration of 0,80,90,100,110,120 μg/g for a month.When the fry grew into 16 cm,the female percent was counted.Result]The effect of female sex-reversal of same days fry was significantly different by different concentration drug(P<0.01).The highest female rate about 67.24% was obtained by 0 day fry feed in 120 μg/g drug.The highest female rate was 56.58%,24.83 of 5,10 days fry feed in drug of 100,90 μg/g concentration.The effect of female sex-reversal of 0,5,10 days fry was significantly different by feeding drug in same concentration(P<0.01).And the highest female rate was obtained on 0 day fry.Conclusion] The best female sex-reversal could be caused by 120 μg/g drug on 0 day fry.