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Mountains. from the Great Lakes region south to the Gulf of Mexico. Introduced primarily as prey for other fish. Diet includes other fishes. Known to eat eggs and larvae of endangered fishes and considered a competitor. Green sunfish were tied for 5th on the list of 28 nonnative fish species considered to adversely impact the native fishes in the Colorado River Basin (Hawkins and Nesler 1991). 17. White crappie: Their native distribution is east central North America from Minnesota west to the Appalachian Mountains south to the Gulf Coast and west to Texas. Incidental catches of this species have occurred in Navajo Reservoir, New Mexico. This species has a greater tolerance for turbid waters and would likely fare better then black crappie in mainstem habitats. Diet includes other fishes. White crappie were ranked 28th on the list of 28 nonnative fish species considered to adversely impact the native fishes in the Colorado River Basin (Hawkins and Nesler 1991). There low ranking is related to their limited distribution in the Basin. 18. Grass carp: Their native range is Asia, primarily China and Thailand. Have been introduced into the United States as a vegetation control. Only triploid grass carp are being used in the Upper Basin. because they lack the ability to reproduce. This allows their numbers and distribution to be controlled. Habitats include lakes, reservoirs, ponds, rivers, and irrigation ditches. Not known to prey on other fishes, but can alter habitats of other fishes by changing vegetation. This species was not included on the list of 28 nonnative fish species by Hawkins and Nesler (1991), though considered by many as undesirable in mainstem rivers. B. Recreational Fishing 1. Colorado: Anglers fished approximately 8.2 million days in 1991: each angler fished an average of 12.1 days each (Colorado Division of Wildlife 1992). Seventy-nine percent of this fishing occurred in coldwater lakes and streams. The remaining 21 percent was in cool and warm waters. In the nine counties of the northwest region of Colorado (area representing the Upper Basin), anglers fished 955,398 days (23 percent) of the State total. Over 70 percent of this fishing was in cold water habitats. Fishing for warmwater species (black crappie, largemouth bass, catfish, etc.) represented about six percent of the fishing effort. Warmwater fishing in the northwest region accounts for about 9.5 percent of the total warmwater fishing in Colorado. The Colorado Division of Wildlife would like to increase warmwater fishing opportunities in western Colorado. A survey of warmwater anglers in Delta, Garfield, Mesa, and Montrose counties concluded that anglers fished most often for catfish (36 percent) and largemouth bass (25 percent; Colorado Division of Wildlife 1996). In ponds that would be reclaimed through Recovery Program efforts, 75 percent supported restocking with largemouth bass, bluegill, and black crappie. 52 percent supported restocking with only trout. Sixty-three percent of the anglers reported that they were satisfied 23