Genetic diversity in three river populations of the giant freshwater prawn (Macrobrachium rosenbergii) in Bangladesh assessed by microsatellite DNA markers
Khan, S.R. (Bangladesh Agricultural Univ., Mymensingh (Bangladesh). Dept. of Fisheries Management) | Akter, H. (Bangladesh Agricultural Univ., Mymensingh (Bangladesh). Dept. of Fisheries Biology and Genetics) | Sultana, N. (Bangladesh Agricultural Univ., Mymensingh (Bangladesh). Dept. of Fisheries Biology and Genetics) | Khan, M.G.Q. | Wahab, M.A. | Alam, M.S.
Information on intra- and inter-population genetic diversity of cultured species may help develop efficient management and stock improvement programs. The study was undertaken to assess the genetic diversity in three wild populations namely the Paira, the Naaf and the Pashur rivers of the giant freshwater prawn (Macrobrachium rosenbergii de Man). Varied number of alleles, 5-14 was detected at the seven polymorphic microsatellite loci with an average of 9.833, 9.167 and 10.167 in the Paira, Naaf and Pashur populations, respectively. The average heterozygosity observed (Ho: 0.634) and expected (He: 0.827) were highest in the Pashur population. The Ho values of all the loci were found to be lower than the respective He values and thus fixation index (Fis) values were positive in all the populations ranging from 0.203 to 0.268, reflecting a high level of inbreeding. Ten of the 21 tests comprising seven loci in three populations for deviations from Hardy-Weinberg expectation were significant. The population differentiation (Fst) value ranged from 0.012 to 0.021 indicating a low level of differentiation among the populations. Results revealed a moderate level of genetic variability though there was deficiency in observed heterozygosity in the three river populations of M. rosenbergii. The detection of the reducing trend in the effective population size in the rivers indicates that a pragmatic management plan is needed to establish equilibrium between the catch and the maintenance of genetic diversity of the populations of M. rosenbergii.
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