Microsatellite analysis on genetic diversity of Sinonovacula constricta stocks in Yueqing Bay and Sansha Bay

Abstract:

In this study, the families of Penaeus monodon were produced according to an unbalanced nest design that each male mated with 1-3 females. The feed conversion ratio（FCR） and the special growth rate(SGR) of the 13 families were researched by an 8week growth experiment. The FCR of these families were ranged from 1.04 to 1.74 and the SGR were ranged from 2.97 to 4.0. The SGR of S13-S11 was significantly higher than the other families(P<0.05). Compared with other families, the SGR of S3-S5 was the lowest, but the FCR was significantly higher than other families (P<0.05). The 48hour ammonia nitrogen stress of different families was proceeded after the growth experiment. The results showed that ammonia nitrogen had different effects in different Penaeus monodon families.The THC, enzymes activity of immunity and the survival rate of these families were distinguishing. Correlation analysis showed that the THC and the survival rate had significantly positive correlation. However, the activity of SOD and AKP was negatively correlated with the survival rate.And there was no correlation between the POD and the survival rate. Altogether, this research considered that the halfsib families whose fathers were L2 and S11 were significantly stronger in survival and growth rate than others, which implied potentials for the further selective breeding.