The predatory carp (Chanodichthys erythropterus), also known as the redfin culter, is a species of ray-finned fish in the genus Chanodichthys. This East Asian freshwater cyprinid ranges from the Amur River south to Taiwan and the Red River, as well as Lake Buir in Mongolia. It reaches 102cm (3ft 4in) in length and 9kg (20lb) in weight.