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

摘要

Genetic diversity of cultivated populations was investigated using assay of vertical slab polyacrylamide gel eJectrophoresis 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_c) is 0.042 +- 0.034, 0.042 +- 0.031, 0.094 +- 0.042 and 0.097 +- 0.047 respectively; and the observed heterozygosity (H_o) 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.