早期分级养殖对黄颡鱼生长、成活及性比的影响  

Effects of Early Size Grading on Growth,Survival and Sex Ratio of Pelteobagrus fulvidraco Richardson

作　　者：董俊锋[1] 樊启学[1] 张磊[1] 李波[1] 杨凯[1] 方巍[1] 

机构地区：[1]华中农业大学水产学院,武汉430070

出　　处：《华中农业大学学报》2008年第3期400-404,共5页Journal of Huazhong Agricultural University

基　　金：国家科技支撑计划项目(2007BAD37B020);湖北省"十一五"重大攻关项目(2006AA203A01;2006AA201B05)资助

摘　　要：将来自于同一亲本的黄颡鱼按规格分为A、B、C 3组,A组为未分级组[体长(5.32±0.52)cm,体重(1.60±0.54)g],B、C 2组为分级组,其中B组为大规格组[体长(5.63±0.41)cm,体重(1.88±0.50)g],C组为小规格组[体长(4.85±0.22)cm,体重(1.11±0.17)g],饲养在9个网箱中。经60 d养殖,B组增长率显著高于C组,A、B 2组无显著差异;3组增重率无显著差异。A组的体长和体重的变异系数显著高于B、C 2组,B、C2组之间无显著差异;C组的体长和体重变异系数的变化率显著高于A、B 2组。各组的成活率、特定生长率、雌雄比率、成熟度指标均差异不显著;各组中雄性的增长率、增重率、特定生长率均高于雌性,除A组增长率雌雄差异不显著外,其余各组各指标雌雄差异均显著;而成熟度各组中雌性均显著高于雄性。试验结果表明,黄颡鱼早期分级养殖,有利于保持整体规格的一致,但对整体的成活率及特定生长率等无显著影响。Juvenile Pelteobagrus fulvidraco 67 days old from the same blood were graded into largesized group [（5. 63 ± 0. 41） cm and （1. 88±0. 50） g,group B],small group [（4. 85±0. 22） cm and （1.11±0.17） cm,group C] and ungraded group [（5. 32±0. 50） cm and （1.60±0.54） g,group A] as control. Growth performance of Pelteobagrus fulvidraco of all the treatments were tested in 9 experimental cages with three replicates for each treatment in a 60-day trial. Growth rate of body length was size-dependent, group B grew faster than group C, but the difference between ungraded group and graded groups was not significant. The coefficient of variations of length and weight of ungraded group were higher than those of graded groups significantly, but the difference was not significant between group B and C. Changing rate of coefficient of variation of length and weight of group C were higher than those of group A and B significantly, but the difference was not significant between group A and B. Size grading did not lead to improve growth rate of body weight, survival, specific growth rate of Pelteobagrus fulvidraco. The growth rate of body length and weight, specific growth rate of male were larger than female in all the groups,except growth rate of body length in group A. The results showed that size grading in early stage seems to be an unnecessary operation in cultivation of Pelteobagrus fulvidraco.

关 键 词：黄颡鱼 分级养殖 生长 性比 

分 类 号：S962.3[农业科学—水产养殖]