Impacts of traditional husbandry practices on exploitable levels of genetic diversity in cultured 'Tra' catfish (Pangasianodon hypophthalmus) in the Mekong Delta, Vietnam

摘要: Sutchi catfish (Pangasianodon hypophthalmus) – known more universally by the Vietnamese name ‘Tra’ is an economically important freshwater fish in Mekong Delta Vietnam that constitutes food resource. Artificial propagation technology for Tra has only recently been developed along main branches of River where than 60% local human population participate fishing or aquaculture. Extensive support culture general, and (P. particular, provided government to increase both scale production develop international export markets. In 2006, total exports reached approximately 286,602 metric tons (MT) were valued at 736.87 $M with a number large new destinations being developed. Total value from predicted USD 1 billion 2020. While promising future, concerns have raised about long-term quality fry effectiveness current brood stock management practices, issues largely neglected date. In this study, four DNA markers (microsatellite loci: CB4, CB7, CB12 CB13) specifically earlier study applied examine genetic artificially propagated Vietnam. The goals assess: (i) how well available levels variation used artificial (breeders three private hatcheries Research Institute Aquaculture No2 (RIA2) founders) conserved; (ii) whether not diversity had declined significantly over time improvement program RIA2. A secondary issue addressed was could best be assist industry development. extracted fins collected two inf Vietnam, samples Study outcomes: i) Genetic estimates similar to, slightly higher than, wild reference samples. addition, relative contribution breeders commercial strongly suggest true Ne likely less breeder numbers used; ii) RIA2, no significant differences detected gene frequencies among generations (FST=0.021, P=0.036>0.002 after Bonferroni correction); small observed alleles sample populations. To date, industry, but project they evaluate selective breeding RIA2 undertake correlations between marker trait variation. associations using loci, analysis training practical applications use molecular aquaculture culture, particular.