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

Abstract:

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.