不同浓度雌二醇对淞江鲈存活和生长的影响

摘要

[Objective] To discuss the effects of different concentrations of estradiol on the survival rate and growth of Trachidermus fasciatus.[Method] The changes of survival rate,total length,body weight,and behaviors of T.fasciatus fries induced by different concentrations of estradiol were studied.[Result] At 30-day-old,the survival rate,total length of T.fasciatus in test groups had no significant difference with control group (P>0.05).At 15 day-old,the whole length of T.fasciatus in test groups had no significant difference with control group(P>0.05),which indicated that estradiol had no significant effect on the survival rate and growth of T.fasciatus.The survival rate of T.fasciatus in test groups,total length of T.fasciatus in 200 μg/L estradiol group,the body weight of T.fasciatus in 100 μg/L estradiol group were all significantly lower than control group (P<0.05).In the stages of 30-45 days and 75-90 days,the descent speed of survival rate of T.fasciatus was significantly lower than those in other stages.In the stage of 30-45 days,the increment speed of whole length of T.fasciatus was obviously higher than other stages.After 60 days,the increment speed of body weight of T.fasciatus was obviously higher than previous stages(P<0.05).Estradiol had almost no effect on eating of T.fasciatus,but it had obvious effects on fighting and benthic behavior of T.fasciatus.In control group,there was serious fighting and benthic behavior lasted for one month.In 400 g /L estradiol group,fighting phenomenon was almost not observed,and the benthic behavior was completed within 15 days.[Conclusion] The research results can lay the foundation for unisexual breeding of T.fasciatus.%[目的]探讨不同浓度雌二醇对淞江鲈幼苗存活率和生长的影响.[方法]研究不同浓度雌二醇诱导下淞江鲈的存活率、全长、体重和行为的变化.[结果] 30日龄,试验组淞江鲈的存活率、体重与对照组差异不显著(P>0.05);15日龄,试验组淞江鲈的全长与对照组差异不显著(P>0.05),表明雌二醇在早期对淞江鲈的存活率和生长的影响不明显.各试验组淞江鲈的存活率、200 μg/L雌二醇组淞江鲈的全长和100 μg/L雌二醇组淞江鲈的体重均显著低于对照组(P<0.05).30~45、75~90日龄淞江鲈存活率的下降速度明显低于其他时期;在30~45日龄淞江鲈全长的增长速度明显快于其他阶段;60日龄后,淞江鲈体重的增长速度明显快于前期(P<0.05).雌二醇对淞江鲈的摄食几乎没有影响,对争斗和转底栖行为影响明显,对照组争斗严重,转底栖行为持续1个月;400 μg /L雌二醇组几乎没有观察到鱼的争斗现象,在15 d内就全部完成转底栖行为.[结论]研究结果可为淞江鲈单性育种奠定基础.