雌核发育鲢各系及与普通鲢生长的比较研究

Growth Comparison Between Different Strains of Gynogentic Silver Carp and Silver Carp (Hypophthalmichthys molitrix)

在相同池塘养殖条件下,迸行了雌核发育鲢各系(当年鱼)及与普通鲢的生长对比试验。结果表明:所选育的雌核发育鲢1系、2系间无显著差异,杂交系较1系、2系呈一般显著性差异(P<0.05);雌核发育鲢较普通鲢生长快,平均体长增长快7％以上,体重增长快14％以上,呈显著差异(P<0.01);其中雌核发育鲢杂交生长最快,其体重增长比普通鲢快23.8％,体长增长比普通鲢快12.4％,呈非常显著差异(P<0.005)。密度越稀,增长越快,雌核发育鲢各系成活率(83.4％以上)均高于普通鲢(64.8％),且雌核鲢体型较普通鲢肥厚。

The paper deals with growth comparison between different strains of gynogenetic silver carp and common silver carp at age 1 under the same culture condition in ponds. The results showed it was not significantly different between gynogenetic silver carp strain 1 and strain 2. There were average significant difference between the hybridism strain and gynogenetic silver carp strain 1 or strain 2. The growth was faster for gynogenetic silver carp strains than that for common silver carp. The average standard length increased by 7 % , the average weight increased by 14 % , there were significant differences in standard length and body weight (P < 0. 01) . The growth was the fastest for the gynogenetic silver carp hybridism strain. The average body weight increased by 23. 8 % , the average standard length for the hybridism strain was 12. 4 % larger than that for common silver carp and there was extremely signficant difference (P < 0. 05) . The lower the density was, the larger the weight increasement was. The body for gynogenetic carp was deeper than that for common silver carp in the same standard length.