Genetic variability of cultured populations of the Pacific abalone (Haliotis discus hannai Ino) in China based on microsatellites
2007
Li, Qi | Shu, Jing | Yu, Ruihai | Tian, Chuanyuan
The genetic diversity of cultured populations of the Pacific abalone (Haliotis discus hannai Ino) from northern China was analysed using seven microsatellite markers. The microsatellite loci were polymorphic for all the populations, with an average of 8.7 alleles per locus (range 8.0-9.4). The mean observed and expected heterozygosities were 0.547 (range 0.500-0.596) and 0.774 (range 0.754-0.787) respectively. The allelic diversity in terms of number of alleles per locus was considerably lower than that previously found in wild populations (range 21.8-23.0), indicating that bottleneck effects occurred when each population was founded. Significant genetic differentiation among the five cultured populations was shown using Fst and Rst values, and pairwise comparison based on allelic distribution. A neighbour-joining analysis of the genetic distance did not show a consistent relationship between the geographic and the genetic distances, suggesting the existence of exchanges of breeds and eggs between the hatcheries. The results obtained in this study are useful for a number of areas of interest for fisheries management and the aquaculture industry, especially with regard to breeding programmes.
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