The predatory carp (Chanodichthys erythropterus), also known as the redfin culter[1] or skygazer, 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.[2] It reaches 102 cm (3 ft 4 in) in length and 9 kg (19 lb 13 oz) in weight.[2]