Allozyme Markers for Population Structure Analysis in Labeo dero (Hamilton Buchanan, 1822)

摘要

Labeo dero specimens, from four different rivers (n= 60), were analysed for allozyme variations. The eighteen enzyme systems screened provided twenty five scorable loci. Seven loci were polymorphic. The significant genotype heterogeneity was observed,between the sample sets. The identified loci exhibited significant potential, to determine population structure of L. dero, across its natural range of distribution. Labeo dero (Cyprinidae) is an important food fish and inhabits fresh water streams at the foothill regions. It is distributed in the rivers originating from the Himalayan ranges, across China, Myanmnar, India, Nepal and Pakistan, hi India, it is distributed in the river systems of the Indus and Ganga and is categorized among the vulnerablespecies of India (Mahanta et. al. 1994). At present, the contribution of L. dero to fisheries is through capture from natural resources. However, it is identified as a potential cultivable species. In view of the significance attached to the species, planned conservation of natural populations and fisheries management is necessary. To plan the appropriate strategy, necessary documentation of polymorphic markers and pattern of genetic variation across its natural distribution range, needs to be explored. Available literature on biology and other studies on L. dero have been reviewed by Chonder (1999). The genetic research on the species is limited, restricted to karyo-typing only (Khuda-Baksh and Chanda 1989). There is no recorded information on genetic markers and distribution of genetic variation in the natural population of L. dero.