The study was conducted to know the breeding performance of two strains (YY and XY male tilapia) of Oreochromisniloticus in Bismillah Agro production hatchery of NoakhaliSadar in Noakhali district, Bangladesh from May to August, 2012.The length, weight of the brood fishes and gonad weight, fecundity, egg fertilization rate, hatching rate, fry survival rate and larval growthin both strain...