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Osmundson, D. B., and L. R. Kaeding. 1989. Studies of Colorado pikeminnow [squawfish] and razorback sucker use of the "15-mile reach" of the upper Colorado River as part of conservation measures for the Green Mountain and Ruedi Reservoir water sales. Final Report. Colorado River Fishery Project, U. S. Fish and Wildlife Service, Grand Junction, CO. 82 pp. Osmundson, D. B., R. J. Rye], M. E. Tucker, B. D. Burdick, and T. E. Chart. 1998. Dispersal patterns of subadult and adult Colorado pikeminnow [squawfish] in the Upper Colorado River. Transactions of the American Fisheries Society 127:943-956. Osmundson, D. B. 2000. Monitoring the Colorado pikeminnow population in the mainstem Colorado River via periodic population estimates. Recovery Program Project Number 22-A-2. Annual report prepared for the Recovery Implementation Program for Endangered Fishes in the Upper Colorado River Basin. U. S. Fish and Wildlife Service, Colorado River Fishery Project, Grand Junction, CO. Pimental, R., R. V. Bulkley, and H. M. Tyus. 1985. Choking of Colorado pikeminnow [squawfish], Ptychocheilus Lucius (Cyprinidae), on channel catfish, Ictalurus punctatus (Ictaluridae), as a cause of mortality. Ross, M. J. 1982. Shielded-needle technique for surgically implanting radio-frequency transmitters in fish. Progressive Fish Culturist 44:41-43. Ryden, D. W., and L. A. Ahlm. 1996. Observations on the distribution and movements of Colorado pikeminnow [squawfish], Ptychocheilus lucius, in the San Juan River, New Mexico, Colorado, and Utah. Southwestern Naturalist 41:161-168. Ryden, D. W., and J. R. Smith. 2001 (In Review). Colorado pikeminnow, Ptychocheilus Lucius, with a channel catfish, Ictalurus punctatus, lodged in its throat in the San Juan River, Utah. Tetra Tech, Inc. 2000. Concept development report: Hartland Diversion Dam fish passage structure, Delta, Colorado. Prepared for U. S. Bureau of Reclamation, Grand Junction Area Office. Contract No. 1425-6-CA-40- 1730A. 55