Abstract
Restriction endonuclease analysis of mitochondrial DNA (mt-DNA) in Labeo rohita from the river Ganges and a hatchery-maintained population from a fish farm revealed polymorphism at HindIII site. Interspecific differences in mt-DNA restriction patterns in Indian major carps (Catla catla, L. calbasu and L. rohita) were also compared. An extension of this study in different populations of these widely cultured fishes would be useful for genetic stock identification and genetic diversity documentation.