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Not AvailableComparativecytogenetic studies were done in Indianmajor carps Labeo rohita (Ham,),Catla catla (Ham.)and Ciim:hintAsmtigala (Ham,)by conventional karyotyping and nucleolar organizer regions (NOR) banding. The diploidchromosome number in these species was found to be 2n=50, Interspeciesvariation in karyomorphologywas observed in L. rohita, C: catla and C n2rrgala with chromosome fbrmula10m+ 14sm+8st+ 18t(FN=74),10m+ 16sm+8st+ 16t(FN= 76)and 12m+18sm+6st+14t (FN=80)respectively. Ag-NOR staining also revealed interspecies variation inband pattern, In L. rohita and C catla NORs were localizedon two pairsand in C mrigala NORs were localizedonly on one pairof chromosome. Comparison of chromosorne profilesof present study with earlier reports indicated presence of intraspecific variation in species of IMCs.Not Availabl