再次分级、驯食对小规格鳡生长、残食的影响  

Effects of re-grading and re-weaning on growth,cannibalism of smaller-size juvenile yellowcheek carp(Elopichthys bambusa)

作　　者：沈凡[1] 樊启学[1] 宗克金[1] 宋林[1] 张云龙[1] 彭聪[1] 胡培培[1] 赵巧娥 

机构地区：[1]华中农业大学水产学院,武汉430070 [2]北京市水产技术推广站,北京100021

出　　处：《淡水渔业》2012年第4期40-46,共7页Freshwater Fisheries

基　　金：国家农业科技成果转化基金(2009GB2D100247)

摘　　要：研究了再次分级、驯食对初次分级产生的鳡(Elopichthys bambusa)幼鱼弱小群体(S群)生长、存活的影响。试验设5组,A组试验鱼取自初次分级并驯食后的大规格群(B群),为对照组;B、C、D、E组取自S群,B组再次分级不再驯食,所分两级为B1、B2亚组;C组再次分级再次驯食,两级为C1、C2亚组;D组不再分级再次驯食;E组不再分级不再驯食。饲养85 d。结果显示:A组全长(TL)、体重(BW)始终最高,终末BW以E组最低;E组体重特定生长率(SGRBW)(55～139 DAH)最低;总存活率(SR)(55～139 DAH)A组最高,C组其次,E组最低;总残食率(CR)(55～139 DAH)E组最高,D组其次;初始体重变异系数(CVBW)对总CR影响显著(P=0.001),可用线性模型y=0.514 9x-7.761 7(r2=0.667)阐释两者关系。结果表明,再次分级和再次驯食有利于S群存活,但不能使S群规格在85 d内追及B群。Effects of re-grading and re-weaning on growth, size heterogeneity, cannibalism and survival of smaller - size juvenile yellowcheek carp, Elopichthys bambusa, were investigated in the 85 days feeding experiment. There were 5 groups which were fed with different feeding regimes. Fish in group A （the control group） was bigger, which were produced by first grading and weaning. Fish in group B, C, D and E produced by first grading and weaning were smaller, and rearing with the regime of re-grading （ B）, re-grading and re-weaning （ C）, re-weaning （ D）, and neither re-grading nor re-wea- ning （E）. According to the size categories, juveniles in both group B and C were re -graded two subgroups, B1 and B2, C1 and C2. The results of present experiment were as follows ： total length and body weight of juveniles in group A were higher than those in other groups during the experiment. Body weight was the lowest in group E at the end of the experi- ment. SGR of body weight （55 ~ 139 DAH） was the lowest in group E. Total survival rate （55 - 139 DAH） was the highest in group A, the second in group B, and the lowest in group E. Total cannibalism rate （55 - 139 DAH） was the highest （63.98%） in group E, the next highest in group D. Initial coefficient of variation of body weight of juveniles exhibited a significant effect on total cannibalism rate （ P = 0. 001 ）, and the relationship between the two parameters could be ex- plained by the line model y = O. 5149x - 7. 7617 （r2 =0. 667）. These results suggested that： re-grading and re-weaning were good for the survival of the smaller juveniles produced by first grading. However, the size of smaller juveniles pro- duced by first grading, feeding with any regime in the present experiment, was still lower than the size of bigger juveniles.

关 键 词：鳡(Elopichthys bambusa) 生长 残食 分级 驯食 

分 类 号：S965.199.23[农业科学—水产养殖]