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the entire year. The largest oocytes gradually increase in size until they are spawned during mid May to July in C. discobolus and during mid May to mid June in C. ardens. Spawning in 1972 occurred in a period of maximum water temperature. The gonad index data correlated well with the stages of development of the testes and with increasing oocyte diameter. 5. Andrews, A. K. 1970. The distribution and life history of the fathead minnow (Pimephales promelas). Ph.D. dissertation Colorado State University, Fort Collins. The major areas of emphasis of this investiga- tion were lotic and lentic distribution and the life history of the fathead minnow in two different environments in Colorado. The habitats, food, and community relationships were also studied. 6. Anonymous. 1947. Minnow swallows trout. Colorado Conservation Comments 10(3):14. Bill Lowe, of Delta, Colorado, caught a Colorado squawfish, Ptychocheilus lucius, in the Gunnison River a few miles below Delta that measured 28 inches and weighed 10 pounds. Field reports indicate that this species of large minnow is on the increase in Colorado waters, and that they may be also working upstream in recent years. The squawfish has been taken frequently from the lower waters of the Gunnison, Colorado, White, Yampa, and Green rivers. 7. Austin, L. H., and G. V. Skogerboe. 1970. Hydrologic inventory of the Uintah Study Unit. Utah Division of Water Resources and Utah Water Research Laboratory, Logan, Utah. 182 pp. The hydrologic basin of Uintah was studied as part of the state water plan to help coordinate the uses of the water resources in the state of Utah. The study included: geology, usable lands, history, climate, streamflow, groundwater, water quality, water budgets, and water manage- ment aspects. LIFE HISTORY DISTRIBUTION ECOLOGY POPULATION BEHAVI01~ DESCRIPTION ENDANG. FISH DISTRIBUTION MOVEMENT S GUNNISON R. 3 FLOW WATER QUAN. WATER QUAL., GEOLOGY HISTORY MANAGEMENT AGRICULTURE RESERVOIRS 14