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has indicated that these indigenous species are <br />declining in abundance. Because of the possi- <br />bility that Juniper Springs dam may be constructed <br />on the Yampa River as part of the Colorado <br />River Storage Project and the documentation <br />that the cold, clear waters from Flaming Gorge <br />Dam have reduced the numbers of these rare <br />indigenous species, this study is attempting to <br />locate possible spawning areas to determine and <br />define the ecological requirements for this <br />critical phase of the life history. The use of <br />sonic tags will be employed to attempt to track <br />the adult fish during the spawning period. If <br />possible spawning areas in the river are found, <br />the type of substrate, water velocity, depth, <br />temperature, etc, will be documented. A basic <br />biological study of the flannelmouth sucker <br />(Catostomus latipinnis) and the bluehead sucker <br />(Catostomus discobolus) will also be made in <br />the study area. <br />218. McAda, C., K. Seethaler, and R. Wydowski. No Date. ECOLOGY <br />Life history and ecology of endemic fish ENDANG. FISH <br />inhabiting the upper Colorado River HABITAT <br />system. Utah Cooperative Fishery Research DTSTRIBUTION <br />Unit, Utah State University, Logan. 2 pp. LIFE HISTORY <br />(mimeo) YAMPA R. <br />Recent studies were concentrated on the Yampa <br />River of northwestern Colorado because it is <br />the last major river in the drainage basin that <br />remains relatively uninfluenced by man's activi- <br />ties. Humpback suckers appear in the mouth of <br />Yampa in late fall and remain there until late <br />spring. No evidence of spawning has been <br />found. Colorado squawfish enter the Yampa in <br />mid-July to August and migrate upstream to <br />spawn. Young of the year, were common in this <br />area 10 years ago. It appears that the primary <br />importance of the Yampa River is not only as <br />habitat for endangered or threatened species, <br />but as a modifying influence on the Green River <br />below its confluence with the Yampa. <br />219. McDonald, D. B., and P. A. Dotson. 1960. ENDANG. FISH <br />Fishery investigations of the Glen Canyon ETHNOLOGY <br />and Flaming Gorge impoundment areas. Utah DISTRIBUTION <br />State Fish and Game, Salt Lake City. HTSTORY <br />Information Bulletin 60-3. 70 pp. INVERTEBRATES <br />VEGETATION <br />DESCRIPTION <br />FLAMING GORGE RES. <br />91 <br />