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habitats have been identified as important resting and feeding areas for adult razorback suckers (Tyus and Karp 1990). Temperatures in this portion of the White River are suitable for native fishes. Biological Environment Miller et al. (1982a) found 15 species of fish in the White River (8 nonnative, 7 native). These nonnatives may compete with and/or prey on razorback suckers. The establishment of nonnative sport fishes in Taylor Draw Reservoir may contribute to nonnative fish populations downstream. Food supply for larval, juvenile, and adult razorback suckers is not likely to be limiting in the White River (Bestgen 1990). Relationship to Additional Selection Criteria: For the razorback sucker, additional selection criteria were developed to assist in the selection of proposed critical habitat designations. This reach of the White River meets those criteria as discussed below. Presence of Spawning Population There has been no documentation of razorback sucker reproduction in the White River. Nursery Habitat The habitat description by Miller et al. (1982a) indicates that potential nursery habitat is present in this reach of the White River. Backwaters and other low-velocity environments occur at high water providing food and higher water temperatures than the river channel. Historic or Present Distribution Historic accounts of razorback suckers within the White River indicate that the species was present in the system (Quartarone 1993). Recent research efforts indicate that the razorback sucker is rare within the White River (Bestgen 1990). An adult razorback sucker was captured approximately 18 miles upstream from the Green River in 1987 (Steve Cranney, UDWR, pers. comm.). Maintenance of Rangewide Distribution The White River through this reach is associated with the upper Green River fish community. This reach has the potential to provide adult razorback sucker habitat for the population which exists within adjacent Green River reaches. 56