雌核发育鲢各系及与普通鲢生长的比较研究

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。

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

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.