Genetic Variation in Four Hatchery Populations of Thai Pangas, Pangasius hypophthalmus ofMymensingh Region in Bangladesh Using Allozyme Marker

Suman Barua; Mohammad Shafiqul Alam; Md. Mukhlesur Rahman Khan; Vibeke Simonsen

Genetic Variation in Four Hatchery Populations of Thai Pangas, Pangasius hypophthalmus ofMymensingh Region in Bangladesh Using Allozyme Marker

2004

Suman Barua | Mohammad Shafiqul Alam | Md. Mukhlesur Rahman Khan | Vibeke Simonsen

To investigate genetic variation four hatchery populations (Shambhuganj, Brahmaputra, Anudan andBhai-Bhai) of Thai pangas (Pangasius hypophthalmus) of Mymensingh region in Bangladesh were analyzedby allozyme electrophoresis. Using six enzymes, nine presumptive loci were identified where three (Est-1*, Gpi-2*and Pgm*) were polymorphic (p,0.95) in Anudan and Brahmaputra populations and one locus, Est-1* waspolymorphic in Shambhuganj population. No polymorphic locus was found in Bhai-Bhai population. The meanproportion of heterozygous loci per individual was 11.3?8.5% which ranged from 0.0% (Bhai-Bhai population)to 20% (Anudan population). The mean number of allele per locus was 1.3 that ranged from 1.0 (Bhai-Bhaipopulation) to 1.6 (Anudan population). The UPGMA dendrogram showed that the four populations weredivided into two groups by the genetic distance, D=0.18 but the populations were not geographically isolated.Finally the results indicated that the Anudan and Brahmaputra populations were showed higher geneticvariation whereas Bhai-Bhai population lost their genetic variation completely.

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