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<br />vi <br /> <br />I <br />I <br />I <br />I <br />J <br />I <br />II <br />I <br />Ii <br />,I <br />f <br />I <br />, <br />I <br />I <br />I <br />I <br />il <br />t <br /> <br />were captured in high-velocity, recirculating eddies and Colorado pikeminnow were <br />captured in eddies or shorelines. Two humpback chub were implanted with <br />transmitters in mid-June and early July and both demonstrated fidelity to specific <br />eddies in the Little Snake River until late July when they moved to the Yampa <br />River. Both telemetered humpback chub moved 5.6 and 14.5 km out of the Little <br />Snake River, into the Yampa River, and continued downstream an additional 26 and <br />24 km into Yampa Canyon. Total distances moved were 32 to 39 km and their <br />final destinations were within 2 km of each other. These long-distance movements <br />were similar to movements by humpback chub in the Grand Canyon for spawning <br />and similar to distances that humpback chub move between population groups in <br />Westwater Canyon, Utah and Black Rocks, Colorado in the Colorado River. Both <br />telemetered humpback chub remained in the Little Snake River while average daily <br />temperatures were 1-2 Oc warmer than in the adjacent Yampa River. They left the <br />Little Snake River when this relationship reversed and average daily temperatures in <br />the Yampa River became warmer and just before flows reached baseflow levels in <br />the Little Snake River. Humpback chub occupied the Little Snake River during their <br />spawning period and moved a relatively long-distance if they originated in the <br />Yampa River. These observations are significant because they support the <br />possibility that humpback chub might be attempting to spawn in the Little Snake <br />River. Spawning success was not confirmed by accepted methods such as the <br />collection of spawning fish, juveniles, or larvae; although 14 larval Gila were <br />collected, they were too small to use conventional morphometric characteristics to <br />identify them to species. Gila larvae may require genetic analysis to confirm <br />species identification. Spawning success of humpback chub will be difficult to <br />detect if spawning fish are few resulting in small numbers of larvae that could <br />quickly drift out of the Little Snake River. <br />