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considered to adversely impact the native fishes in the Colorado River Basin (Hawkins and Nesler 1991). 6. Bluegill: The native distribution is in eastern and central North America from the Great Lakes to the Gulf of Mexico. Bluegill have been widely introduced in the Colorado River Basin in habitats similar to and often in association with largemouth bass. Although, not stocked directly into the mainstem rivers, fish that escape from standing waters move into low velocity habitats (the same habitats used by young endangered fishes). Their diet includes other fishes. Bluegill were ranked 11th on the list of 28 nonnative fish species considered to adversely impact the native fishes in the Colorado River Basin (Hawkins and Nesler 1991). 7. Black crappie: The native distribution is along the Atlantic Coast from Florida to Virginia, south along the Gulf Coast to central Texas, north to North Dakota and east to the Appalachian Mountains. This species has-been introduced in standing waters of the Upper Colorado River Basin. Black crappie were not identified as a problem is 1991 by Hawkins and Nesler, however recent capture of large numbers in nursery areas in the Green River have raised concern about this piscivore (fish eater). 8. Channel catfish: The native distribution of this species is primarily the central drainages (Mississippi and Missouri rivers) of the United States. Its native distribution may have also included portions of the Atlantic Coast. This species has been introduced into the mainstem rivers, lakes, reservoirs, and ponds in the Upper Colorado River. Their diet includes other fishes. Channel catfish were ranked 1st on the list of 28 nonnative fish species considered to adversely impact the native fishes in the Colorado River Basin (Hawkins and Nesler 1991). 9. Red shiner: The native distribution is in the Mississippi and Gulf drainages, from South Dakota through Illinois and from Louisiana westward into northern Mexico. This fish became established throughout the Colorado River basin primarily through bait bucket transfers (being used as a baitfish, but released into a water where it did not previously occur). Known to eat larvae (newly hatched) endangered fishes. Red shiner were ranked 2nd on the-list of 28 nonnative fish species considered to adversely impact the native fishes in the Colorado River Basin (Hawkins and Nesler 1991). 10. Mosquitofish: Their native distribution is in the central United States from southern Illinois and Indiana south to Veracruz, Mexico and Florida, and north along Atlantic slope to southern New Jersey. This fish has been introduced extensively in the Upper Basin for mosquito control. Occurs in standing waters and low velocity river habitats. Occasionally eats other fish, probably competes with native fishes for food resources. Mosquitofish were ranked 8th on the list of 28 nonnative fish species considered to adversely impact the native fishes in the Colorado River Basin (Hawkins and Nesler 1991). 21