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Results and Discussion <br />Catch rate of adult Colorado squawfish during spring and fall in the 15-mile <br />reach was approximately twice that of the adjacent 18-mile reach immediately <br />downstream (Table 1). Catch rates were considerably higher during spring <br />than fall for both Colorado River reaches; the Gunnison River was not <br />sampled in spring. A few Colorado squawfish were seen in fall in all <br />reaches, but none was caught. <br />Catch rate for razorback sucker in the 15-mile reach was 0.045 fish per <br />shocking hour for combined spring and fall efforts--about 25% of that for <br />squawfish. No razorback sucker were captured or seen in the lower 18-mile <br />reach or in the Gunnison. <br />Six Colorado squawfish and two razorback suckers were radio-tagged in late <br />spring (Table 2). All were captured from within the 15-mile reach, most <br />from or near a gravel-pit pond connected to the river at RM 174.4. Contact <br />was lost with one squawfish and one razorback sucker one week after release. <br />Two Colorado squawfish moved downstream 3.4 miles shortly after release, and <br />then moved up the Gunnison River (Fig. 2). One was located in the plunge <br />pool of the Redlands Diversion Dam and the other was in a mid-channel area <br />1.2 miles upstream from the confluence. The fish in the plunge pool later <br />moved downstream to a side channel one mile above the confluence and <br />remained there for at least two weeks during mid-July; it then returned to <br />the 15-mile reach and has remained there, near the site of initial release, <br />during the past six months. The other fish was in the Gunnison River no <br />6