Morphological variance analysis of inbred and hybrid offsprings of African strain and “Nanhai No.1”of Penaeus monodon

Three muhivariation analysis methods（principal component analysis，discriminant analysis and cluster analysis）were used to investigate the morphological variations among two inbreds（NN and FF）and two corresponding hybrids（NF and FN）in Penaeus monodon from two populations of African strain and“ Nanhai No.1” based on seven morphological indexes. In the principal component analysis，three principal components were constructed，and the cumulative contributory ratio was 68.35%. The discriminant analysis indicated that the discriminant accuracy of inbreds populations was higher than that of hybrid populations. The cluster analysis revealed that two major groups were observed for the four populations. The first group was NN，and the second group was FF，NF and FN.