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sustaining populations of Colorado squawfish in reaches affected by dams may require <br />restoration of temperatures that more closely approximate historical regimes (Tyus and <br />Karp 1989). Effects of a diverse and abundant nonnative fish community on Colorado <br />squawfish should also be considered. Integrated laboratory and field research is needed <br />to better determine the role of temperature and other factors that control migration, <br />spawning, early development, and survival of Colorado squawfish in the Colorado River <br />basin. <br />Acknowledgments <br />Funding for this project was provided by the U. S. Bureau of Reclamation, Salt <br />Lake City, Utah under Cooperative agreement 8-FC-40-06460 with the Larval Fish <br />Laboratory, Colorado State University, and by the Recovery Implementation Program of <br />the Upper Colorado River Basin. Project administration was facilitated by R. Williams, <br />L. Crist, and R. Muth. Fish embryos were provided by Dexter National Fish Hatchery <br />and Technology Center, U. S. Fish and Wildlife Service, and Bellvue Fish Research <br />Hatchery, Colorado Division of Wildlife. This manuscript benefitted from reviews by D. <br />Anderson, D. Beyers, T. Edsall, K. Fausch, P. Marsh, D. Osmundson, H. Tyus, J. Ward, <br />and an anonymous reviewer. This paper is contribution 57 of the Larval Fish Laboratory. <br />References <br />Behnke, R. J., and D. E. Benson. 1983. Endangered and threatened fishes of the upper <br />Colorado River basin. Colorado State University Cooperative Extension Service <br />Bulletin 503A. <br />19 <br />