The razorback sucker is a large, warm-water fish native to the Colorado River basin. Construction of more than a dozen dams throughout the lower basin has left little natural habitat for the fish and ...

The effort, led by the U.S. Fish and Wildlife Service, was established in 1988 to reestablish and recover populations of the pikeminnow, the humpback chub, razorback sucker and bonytail fish — all of ...