The grass carp (Ctenopharyngodon idella) is a herbivorous, freshwater fish species of family Cyprinidae, and the only species of the genus Ctenopharyngodon. It is a large cyprind native to eastern Asia, with a native range from northern Vietnam to the Amur River on the Siberia-China border. It is a fish of large, turbid rivers and associated floodplain lakes, with a wide degree of temperature tolerance. In the United States, the fish is also known as white amur, which is derived from the Amur River, where the species is probably native, but has never been abundant. Grass carp have elongate, chubby, torpedo-shaped body forms. The terminal mouth is slightly oblique with non-fleshy, firm lips, and no barbels. Body color is dark olive, shading to brownish-yellow on the sides, with a white belly and large, slightly outlined scales. The average length is about 60-100 cm (24-39 in). The maximum length is 1.4 metres (4.6 ft) and the maximum weight 40 kg (88 lb).