The razorback sucker ("Xyrauchen texanus") is a suckerfish found in rivers and lakes in the southwestern United States. It can grow to in length and is recognisable by the keel between its head and dorsal fin. It used to inhabit much of the Colorado River Basin but commercial fishing, river damming and habitat loss have caused great declines in populations. It is now restricted to the Colorado River upstream of the Grand Canyon and to four lakes, Lake Mead, Lake Mohave, Lake Havasu, and Lake Powell.