GENETIC DIVERSITY OF WILD AND FARMED KALIBAUS (Labeo calbasu, Hamilton, 1822) BY RAPD ANALYSIS OF THE GENOMIC DNA

Genetic diversity of two wild Kalibaus, Labeo calbasu populations and one hatchery stock was studied using random amplified polymorphic DNA (RAPD) method. The three 10–mer random primers (OPA01, OPB02 and OPC03) yielded a total of 26 reproducible and consistently scorable RAPD bands of which 15 (57.69%) were considered as polymorphic (P95) indicating a high level of genetic variation in all the studied populations. Among the three populations, Padma population shows low level of genetic diversity (0.1238) compared to other two and it might be caused by habitat degradation in many ways which ultimately affects the genetic variation of Kalibaus. The UPGMA dendrogram based on Nei’s (1972) original measures of genetic distance (D) indicated the segregation of two wild and hatchery populations of L. calbasu into two distinct clusters: the Hatchery and Padma populations produced one cluster whereas the Jamuna population belonged to another cluster. This indicates that hatchery brood stock is derived from Padma River. Nevertheless, the preliminary study revealed that RAPD technique could be an effective tool in the assessment of population genetic structure of Kalibaus.