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RECOMMENDATIONS • Continue sampling at Black Rocks to estimate population size according to Recovery Program time frame. Continue use of trammel nets, but evaluate alternate techniques that might be less stressful even though they are less effective. • Sampling should occur during mid September to mid October when water temperatures range between 10 and 15°C. • Explore use of open population models to compare with results from closed population models. LITERATURE CITED Chart, T. E., and L. D. Lentsch. 1999a. Reproduction and recruitment of Gila spp. and Colorado pikeminnow (Prychocheilus lucius) in the middle Green River 1992-1996. Final Report to the Recovery Program for the Endangered Fishes in the Upper Colorado River Basin, Project Number 39. Utah Division of Wildlife Resources, Moab and Salt bake City, Utah. Chart, T. E., and L. D. Lentsch. 1999b. Flow effects on humpback chub (Gila cypher) in Westwater Canyon. Final Report to the Recovery Program for the Endangered Fishes in the Upper Colorado River Basin, Project Number 46. Utah Division of Wildlife Resources, Publication 99-36, Moab and Salt Lake City, Utah. Douglas, M. E., and P. C. Marsh. 1996. Population estimates/population movements of Gila cypher, an endangered cyprinid fish in the Grand Canyon region of Arizona. Copeia 1996:15-28. Douglas, M. E., W. L. Minckley, and H. M. Tyus. 1989. Qualitative characters, identification of Colorado River chubs (Cyprinidae; Genus Gila) and the "Art of Seeing Well." Copeia 1989:653-662. Gorman, O. T., and D. M. Stone. 1999. Ecology of spawning humpback chub, Gila cypher, in the Little Colorado River near Grand Canyon, Arizona. Environmental Biology of Fishes 55: 115-133. Haines, B., and T. Modde. 2002. Humpback chub monitoring in Yampa Canyon, 1998-2000. Final report to the Upper Colorado River Fish Recovery Program, Project Number 22a4. U. S. Fish and Wildlife Service, Vernal, Utah. 16