The grass carp (lat. Ctenopharyngodon idella) is a herbivorous, freshwater fish species. Grass Carp are invasive because they are vegitarians. The proper name of Grass Carp is White Amur. It is cultivated in China for food, but was introduced in Europe and the United States for aquatic weed control.
Grass carp have torpedo-shaped body forms. It is a fish of large rivers and floodplain lakes, with a wide degree of temperature tolerance. The average length is about 100 cm (40 in). The grass carp live an average of five to 9 years and can reach the maximum weight 40 kg (90 lb). Grass carp will enter reproductive condition and spawn at temperatures of 23°C (70°F). They eat up to three times their own body weight daily.