Loss of the genetic diversity in cultivated populations of Pseudosciaena crocea by AFLP.

Genetic diversity of two wild and two cultivated populations of Pseudosciaena crocea in Fujian Province were analyzed by AFLP. A total of 472 loci were detected from 120 individuals in the 4 populations, of which 220 (46.61%) are polymorphic. The results from AFLP technique show that the genetic diversity in the cultivated populations has been reduced compared to that of wild populations. The percentage of polymorphic loci, the Nei’s Gene Diversity, Shannon’s Information Index and the mean effective number of alleles per locus in two wild populations are 42.42%—45.14%, 0.1046—0.1245, 0.1659—0.1942 and 1.4153—1.4428, respectively, which in two cultivated populations are 40.83%—40.53%, 0.1027—0.1039, 0.1615—0.1633 and 1.3919—1.3856, respectively. Genetic distance among the 4 populations varies from 0.0359—0.1465, in the mean of 0.079, and the gene flow (Nm) is 1.0808. These results show a lower-level genetic diversity compared to other fishes.