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Ryden, D. W., and F. K. Pfeifer. 1996a Adult fish community monitoring on the San Juan • River: 1995 Annual Progress Report. U.S. Fish and Wildlife Service, Colorado River Fishery Project. Grand Junction, Colorado. 46 pp. and appendices. Ryden, D. W., and F. K. Pfeifer. 1996b. Monitoring of experimentally stocked razorback sucker in the San Juan River: 1995 Annual Progress Report. U.S. Fish and Wildlife Service, Colorado River Fishery Project. Grand Junction, Colorado. 37 pp. Ryden, D. W. 2000. Monitoring of razorback sucker stocked into the San Juan River as part of a five-year augmentation effort: 1997-1999 interim progress report. San Juan River Basin Recovery Implementation Program, USFWS, Albuquerque, New Mexico. ~ Scholz, A. T., R J. White, S. A. Horton, and V. A. Koehler. 1992. Measurement of egg and larval thyroxine concentration as an indicator of the critical period for imprinting in razorback suckers (Xyrauchen texamcs): Implications for endangered stocks in the Colorado River basin. Eastern Washington University, Department of Biology, Cheney, WA. Colorado River Fisheries Project. Technical Report No. 1. 26 pp. Scholz, A. T., R J. White, S. A. Horton, M. B. Tilson, C. M. Williams, and B. Haines. 1993. Thyroxine concentrations and chemical imprinting of razorback sucker (Xyrauchen texarrus} and Colorado squawfish (Ptychocheilus lucius) eggs and larvae reared at Dexter National Fish Hatchery, NM. Eastern Washington University, Department of Biology, Cheney, WA. Colorado ~ River Fisheries Chemoreception Project. Technical Report No. 3. 73 pp. Scholz, A. T., and G. B. Haines. 1997. Chemoreception in razorback sucker and Colorado squawfish exposure of swimup larvae to synthetic chemicals, concomitant with elevated thyroid hormone levels, influences choices of sexually mature adults in an olfactory maze. Draft Report, ~ U.S. Fish and Wildlife Service, Vernal, Utah. Tyus, H. M., and J. F. Saunders. 1996. Nonnative fishes in the upper Colorado River basin and a strategic plan for their control. Final Report of University of Colorado Center for Limnology to Recovery Implementation Program for the Endangered Fish Species in the Upper Colorado River ~ Basin, Denver, Colorado. USFWS (LJ. S. Fish and Wildlife Service). 1980. Bonytail chub; determination as an endangered species. Federal Register 45(80):27710-27713. ~ USFWS (U. S. Fish and Wildlife Service). 1987. Recovery Implementation Program for endangered fish species in the upper Colorado River Basin. Final Report. U. S. Fish and Wildlife Service, Denver, Colorado. USFWS (U. S. Fish and Wildlife Service). 1991. Endangered and threatened wildlife and plants; ~ the razorback sucker (Xyrauchen texanus) determined to be an endangered species, Final rule. Federal Register 56 (23 October 1991):54957-54967. ~ 13