The silver carp is a species of freshwater cyprinid fish, a variety of Asian carp native to north and northeast Asia. It is cultivated in China. Pound for pound, more silver carp are produced worldwide in aquaculture than any other species. They are usually farmed in polyculture with other Asian carps, or sometimes Indian carps or other species. It has been introduced to, or spread into via connected waterways, at least 88 countries around the world. The most common reason for importation was for use in aquaculture, but enhancement of wild fisheries and water quality control were also important reasons for importation. The silver carp reaches an average length of 60-100 cm (24-39 inches) with a maximum of 140 cm (55 inches) and about 45 kg (99 lb).