Correlation analysis of the viral loads with growth and white spot syndrome virus resistance breeding value of Fenneropenaeus chinensis

The epidemic pathogen of Fenneropenaeus chinensis caused by white spot syndrome virus(WSSV)have brought great loss of the F.chinensis cultivation,no effective technical measures could control the WSSV epidemic so far.Improving the germplasm resources and cultivating the new varieties of F.chinensis are better measures to deal with this disease.The correlation among F.chinensis traits is an important parameter,as a result,it is very important to choose an appropriate genetic evaluation method in the analysis of correlation among F.chinensis traits.After testing the growth and white spot syndrome virus(WSSV)resistance of 130 F.chinensis families,we collected the F.chinensis growth and resistance data,and entered the date into database of aquatic animal breeding analysis and management software.According to the results of statistics software analysis,using the comprehensive index method to estimate growth and WSSV resistance breeding value of each F.chinensis family,we chose the five families each of the largest and the smallest growth breededing value,five families each of largest and smallest WSSV resistance breeding value.We detected the WSSV load of these broodstocks,50 d prawn and 170 d prawn of 20 families.The mean WSSV load of broodstock,50 d prawn and 170 d prawn of 20 families were 0.190 8,0.286 6 and 0.232 9 copies/ng DNA,respectively,which showed no significant difference(P>0.05).The correlation coefficients between WSSV-resistance breeding value and WSSV load of broodstock,50 d prawn and 170 d prawn were 0.021,0.463 and 0.185,respectively;and those between growth breeding value and WSSV load of broodstock,50 d shrimp and 170 d shrimp were 0.033,0.048 and 0.019,respectively.The results show that the relationships among growth breeding value,WSSV-resistance breeding value and the WSSV load of shrimp were not significant(P>0.05).