Study on genetic diversity of cultivated populations in 4 species of shrimps

Genetic diversity of cultivated populations was investigated using assay of vertical slab polyacrylamide gel electrophoresis in 4 species of shrimps,which were Penaeus japonicus,Penaeus monodon,Penaeus vannamei and Metapenaeus ensis.The results showed that the mean number of alle-les per locus(A) is 1.3±0.2,1.3±0.1,1.3±0.1 and 1.3 ±0.1 respectively; the percentage of polymorphic loci(P_0.95) is 12.5,6.7,20 and 23.5 respectively; the expected heterozygosity(H_e) is 0.042±0.034,0.042±0.031,0.094±0.042 and 0.097±0.047 respectively; and the observed heterozygosity(H₀)is 0.029±0.024,0.028±0.023,0.154±0.082 and 0.150±0.084 respectively.The difference of genetic diversity is obvious in 4 species of shrimps.The degree of genetic diversity is M.ensis > P.vannamei > P.japonicus > P.monodon.In short,the lower level of genetic diversity is estimated in 4 species of shrimps.