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I I I I I I I I I I I I I I I I I I I information from radiotelemetry can help determine whether interactions with other Gila species and nonnative fishes may be a problem. Adult bony tail chub should be radio-tagged, stocked, and monitored to determine their habitat requirements/limiting factors and to aid in identifying priority recovery sites. The highest priority study site for the radiotelemetry study is the Green and Yampa Rivers at Dinosaur National Monument. In addition, stocking of bony tails into some areas of the Lower Basin where the species historically occurred and habitat may still exist could provide information regarding habitat requirements and preferences. 133. Stock bony tail chub in priority recovery sites. The highest priority recovery and/or reintrodllc.tion sites for - the bony tail chub include the: (1) Green and Yampa rivers at Dinosaur National Monument; (2) Green River at Desolation/Gray ~n; (3) Colorado River at Cataract Canyon: and (4) San Juan River, if suitable habitat appears to be present. The results of Tasks 132 and 21-27 will assist in refining or expanding this list of sites to additional areas in the Upper Basin. In addition, areas in the Lower Basin should be evaluated for their potential as recovery sites. Reintroduction programs should be prepared describing the numbers and sizes of fish to be stocked, time and location for stocking fish, years in which stocking will occur, source of fish for stocking, and a monitoring program to assess program success. Lake Mohave, which has supported an important population of adult bony tail chub that has been used as broods tack in the recovery effort also is a high priority recovery and/or reintroduction site. Attempts should be made to augment this population through stocking. The primary purpose of the Lake ~ve population ~ould be to ~ as a wild refuaium ana-- study area for bony tail chub. 2. Obtain essential information on the life history and habitat requirements of the bonvtail chub. Recovery activities for bony tail chub can be developed only after vital information on the ecological requirements and limiting factors of the species is obtained. Studies need to be conducted on existing, reintroduced, or reestablished populations to determine the roles that predation, competition, habitat modification, and water management play in limiting the survival and reproduction of bony tail chub. Areas in both the Upper and Lower Basins may be utilized in the collection of.this information, and both experimental nonessential and experimental essential populations could be established as necessary to obtain the data. Some initial information will be collected in Task 132. The extent of future work and costs will be better identified after analysis of the initial work. 18