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Thawatchai Ngamsiri Masamichi Nakajima Srijanya Sukmanomon Naruepon Sukumasavin Wongphatom Kamonrat Uthairat Na-Nakorn Nobuhiko Taniguchi 《Fisheries Science》2007,73(4):792-799
The Mekong giant catfish Pangasianodon gigas is endemic to the Mekong River and is a critically endangered species. The genotypes of the microsatellite DNA (msDNA) and
mitochondrial DNA (mtDNA) markers (right domain of the control region) were detected to evaluate the present status of genetic
divergence of this species from the Mekong River in Thailand and Cambodia. The observed and expected heterozygosity values
of Mekong giant catfish in Thailand and Cambodia were relatively low in comparison with those of other nonendangered freshwater
fish species. These two populations from Thailand and Cambodia showed similar levels of genetic diversity, as evaluated by
the 384 nucleotides of the mtDNA control region with 13 haplotypes. The pairwise F
ST value between the two populations based on the genotype frequencies of msDNA and mtDNA markers suggested a close genetic
relationship between the populations in Thailand and Cambodia. The results of this study support the conclusion that the Mekong
giant catfish is critically endangered. Care should be taken to sustain the genetic diversity of this species, as the level
of genetic variability has already decreased in the wild population. This species is a target species for an ongoing stock
enhancement program in the Mekong River in Thailand. It is proposed to apply these markers for proper broodstock management,
such as for minimal kinship selective breeding in the hatchery. 相似文献
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