5种体色瓯江彩鲤的繁殖性能研究

为了解不同体色瓯江彩鲤(Cyprinus carpiovar.color)的繁殖性能差异,对5种体色类型(全红、大花、麻花、粉玉和粉花)瓯江彩鲤在2、3龄阶段的繁殖性能进行了研究。结果表明:3龄雌鱼的绝对繁殖力平均为34.55万粒,比2龄雌鱼的20.09万粒高71.98%;3龄雌鱼的体重相对繁殖力为216.76粒/g,比2龄雌鱼的187.26粒/g高15.75%,3龄雌鱼的繁殖性能极显著地高于2龄雌鱼(P<0.01);而5种不同体色瓯江彩鲤的性腺指数、绝对繁殖力和相对繁殖力均不存在显著差异(P>0.05);瓯江彩鲤的绝对繁殖力与体重呈直线关系:Y=0.0225X-2.5591(R=0.835 5,P<0.01);绝对繁殖力与体长呈幂函数关系:Y=0.0068X^2.8002(R=0.728 5,P<0.01)。3龄雄鱼的性腺重极显著地高于2龄雄鱼(P<0.01),但2龄与3龄雄鱼间的性腺指数不存在显著差异(P>0.05),不同体色雄鱼间的平均性腺指数也不存在显著差异(P>0.05)。综合分析认为:瓯江彩鲤的最佳繁殖年龄,雌性以3~4龄为宜,雄性以2~3龄为宜。

Study on reproductive performance of Oujiang color common carp with five color patterns

In this paper,the reproductive characters and differentiations were studied among Oujiang color common carp(C.carpio var.color) with five color patterns(Whole red,Whole red-big black spots,Whole red-small black spots,Whole white and Whole white-big black spots) at 2-and 3-year-old stages.The results showed that the mean absolute fecundity of 3-year-old fish was 345 500 eggs,higher than that of 2-year-old fish(200 900 eggs);the mean relative fecundity of 3-year-old fish was 216.76 eggs per gram body weight,higher than that of 2-year-old fish(187.26) eggs per gram body weight.The fecundity of 3-year-old fish was significantly higher than that of 2-year-old fish(P<0.01).There were no significant difference in gonadosomatic index(GSI),absolute fecundity and relative fecundity among five types of female Oujiang color common carps(P<0.05).A linear correlation was found between absolute fecundity and body weight expressed as the formula: Y=0.0225X-2.5591(R=0.835 5,P<0.01),and a power function relation between absolute fecundity and standard body length as Y=0.0068X^2.8002,(R=0.728 5,P<0.01).The gonad weight of 3-year-old male fish was significantly higher than that of 2-year-old male fish,but no significant differences were found in GSI between 2-and 3-year-old male fish,and among five types of male Oujiang color common carp(P<0.05).It was suggested that 3-4 year-old female fish and 2-3 year-old male fish would be optimal broodstocks.