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22 I I I I I I I I I I I I I Ii I I I I I explain differences in the fish communities in these rivers and will assist in the management of this and other rivers in the upper Colorado River Basin. Telemetry of humpback and roundtail chub Telemetry provided the first evidence of extended seasonal use of the Little Snake River by humpback chub and documented some of the longest distance movements observed for the species. Humpback chub typically exhibit high fidelity to specific locations. In the Colorado River at Black Rocks and the Grand Canyon, humpback chub show strong site fidelity with localized movements of less than 5 km and move very little during non-spawning periods (Valdez and Clemmer 1982; Valdez and Ryel 19951. Humpback chub in the Little Snake River also showed strong site fidelity with observed movements of less than 1 km, but also migrated fairly long distances (32 and 39 km) to Yampa Canyon in the Yampa River. These long-distance movements were similar to maximum movements (40 km) by humpback chub in the Grand Canyon for spawning and similar to distances (22 km) that humpback chub moved between population groups in Westwater Canyon, Utah and Black Rocks, Colorado in the Colorado River (Kaeding et al. 1990; Valdez and Ryel 1995). We believe that telemetered humpback chub originated in the Yampa River and moved into the Little Snake River in the spring during increasing flows when daily temperatures in the Little Snake River where warmer than temperatures in the Yampa River (Figures 3 and 4). One humpback chub remained in the Little Snake River for at least 28 days in June and July, another remained for at least 21 days in July, and both left by August just before baseflow and as daily temperatures in the Yampa River were becoming warmer than temperatures in the Little Snake River lFigures 3 and 5). Based on the long-distance moved and the time of year, it appears that the occupation of the Little Snake River by humpback chub could be for spawning.