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ponds at the Ouray Endangered Fish Facility. A higher proportion <br />of the razorback suckers should reach sexual maturity in the spring <br />of 1997 because of the expected improved growth. <br />The growth of Colorado squawfish has increased substantially in the <br />new ponds at the Ouray National Fish Hatchery. Lower loading rates <br />and higher zooplankton production have contributed to the increase <br />in growth. Some of these fish are expected to mature in 1997 based <br />on the increased growth rate in the new ponds. <br />IX. References <br />Chart, T. 1994. Personal communication. Utah Division of Wildlife <br />Resource, Moab, Utah. <br />Elmblad, B. 1995. Personal communication. Colorado Division of <br />Wildlife, Grand Junction. <br />Hamman, R.L. 1981. Hybridization of three species of chub in a <br />hatchery. Progressive Fish-Culturist 43: 140-141. <br />Lentsch, L.D. Y. Converse, P.D. Thompson, and T.A. Crowl. 1995. <br />Bonytail reintroduction plan for the Upper Colorado River Basin. Final <br />draft report. Utah Division of Wildlife Resources, Salt Lake City. <br />30 pp. <br />McElroy, D.M. and M.E. Douglas. 1995. Patterns of morphological <br />variation among endangered populations of Gila robusta and Gila cypha <br />(Teleostei: Cyprindae) in the Upper Colorado River Basin. Copeia 1995 <br />(3): In Press. <br />Mueller, G. 1995a. A program for maintaining the razorback sucker in <br />Lake Mohave. American Fisheries Society Symposium 15: 127-135. <br />Mueller, G. 1995b. Personal communication. U.S. Department of the <br />Interior, National Biological Service, Denver, Colorado. <br />Mueller, G., T. Burke, and M. Horn. 1993. A program to maintain <br />razorback sucker in a highly modified riverine habitat. Pages 77-85 in <br />W. Deason and S. Anderson, Editors. Environmental enhancement of water <br />projects. Proceedings of the U.S. Committee on Irrigation and <br />Drainage, October 14-16, 1993, Sacramento, California. <br />Muth, R.T. 1995. Personal communication. Larval Fish Laboratory, <br />Colorado State University, Logan. <br />Osmundson, D.B. 1986. Growth and survival of Colorado squawfish <br />(Ptychocheilus lucius) stocked in riverside ponds, with reference to <br />largemouth bass (Micropterus salmoides) predation. Final Report - <br />Contract 14-16-0009-1501-W02. U.S. Department of the Interior, Fish <br />and Wildlife Service, Salt Lake City, Utah. 172 pp. <br />9