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1、第30卷第1期水产学报Vol.30,No.12006年2月JOURNALOFFISHERIESOFCHINAFeb.,2006文章编号:1000-0615(2006)01-0050-06珠江水系大眼鳜的繁殖生物学王广军,谢骏,庞世勋,余德光(中国水产科学研究院珠江水产研究所,广东广州510380)摘要:为了研究大眼鳜(Sinipercakneri)的繁殖生物学,对珠江水系的322尾大眼鳜性成熟样本进行了生物学指标测量。根据性腺成熟系数周年变化情况和成熟度周年分布,可以推断大眼鳜的生殖季节为4-8月份,产卵旺季为5-6月份。绝对怀卵量
2、随体长、体重、年龄的增加而增加,在11036～106022粒之间,相对怀卵量则不随体长、体重、年龄的变化而变化,而是保持在每克100粒左右。在水温24～25℃时,受精卵经过69h23min孵化出膜。关键词:大眼鳜;繁殖生物学;成熟系数;性腺成熟度;怀卵量中图分类号:S917文献标识码:AReproductivebiologyofSinipercakneriinPearlRiverwatersystemWANGGuang2jun,XIEJun,PANGShi2xun,YUDe2guang(PearlRiverFisheryResear
3、chInstitute,ChineseAcademyofFisherySciences,Guangzhou510380,China)Abstract:Big2eyemandarinfishSinipercakneriisacommerciallyvaluedspeciesthatnaturallylivesinthePearlRiverwatersystemandtheYangtseRiverupriverwatersystem.InordertostudythereproductivebiologyofS.kneri,322mat
4、ureindividualscapturedfromthePearlRiverwatersystemweremeasured.Bymeansofbiologicalsurveyandexperimentalecology,theannualchangeofdevelopmentofgonadandgonadosomaticindex(GSI),thepercentageofgonadalmaturityandthefecundityofthisfishweredetermined.Andthewholeprocessofembryo
5、nicdevelopmentwasobservedandphotographsweretakencontinuously.Basedontheannualchangeofgonadosomaticindex(GSI)andpercentageofgonadalmaturityinwholeyear,itwasconcludedthatthereproductiveseasonoftheS.kneriwasfromApriltoAugust,withabusyseasonfromMaytoJune.Theindividualabsol
6、utefecundityrangedfrom11036to106022eggs,increasingwiththebodylengthandbodyweightandageincreased.Buttheindividualrelativefecunditydidnotchangeevenifthebodylength,bodyweightoragechanging,andkeptthelevelof100eggspergramorso.Theeggsofthefishwasbuoyantandthediameterwas1.2-1
7、.5mm.Therewereseveralordozenguttulesintheyolksac,andonlyonewasevenbiggeramongthem.Atthetemperatureof24-25℃,thefertilizedeggshatchedtofriesinabout69hoursand23minutes.Theseresultswouldprovidetheimportantscientificbasisforthelarge2scaleartificialreproductionandprotectionr
8、esourcesofthefish.AndtheoptimalseasonofartificialreproductionisfromMaytoJune.Keywords:Sinipercakneri;reproductivebiol
