ABSTRACT
Many changes have occurred in the Grand Canyon over the past 100 hundred years. Some of these changes include the closure of Glen Canyon Dam in 1963 and the continuous introduction of alien fishes since the late part of the 19th century. These changes have caused the decline of native fishes. As a result, managers have attempted to promote native fishes by regulating floods, mechanically removing alien fishes and have even investigated use of thermal regulation. The purpose of this paper is to describe the alien fishes of the Grand Canyon, investigate their interactions with native fishes and explore the adaptive management techniques being used to decrease their populations in order to promote native fishes. I conclude the paper by giving my recommendations for suppressing alien fishes to promote native fishes in the Grand Canyon.