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Not AvailableCirrhinus mrigala is an Indian major carp originally inhabitant of the Ganga river system in Northern India. There is paucity of knowledge on age and growth of this commercially important species from Ganges basin. To fulfill this gap, 250 samples of C. mrigala were collected from the main channel of Ganga River and its five major drainages to evaluate intra-basin variations in age and growth composition. Maximum 8+ year age class was recorded from river Betwa. Back-calculation method revealed significant variation (p < 0.05) in different year age classes among the studied rivers. With increase in age, specific rate of linear growth (Cl) and specific rate of weight (Cw) decreased in all the studied rivers. This study will provide new baseline information to fisheries biologists on the current status of biological attributes of C. mrigala across the river Ganga basin.Not Availabl