The sawfin (Pseudobarbus serra), also known as Clanwilliam sawfin, is a ray-finned fish species in the family Cyprinidae. It is placed with the South African redfins in Pseudobarbus. It is tetraploid. Its closest living relative is probably the Cape whitefish (P. capensis). This sizeable cyprinid can grow to over 40 cm (16 in) long and weigh more than 3 kg (6.6 lb).