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24 <br />to a laminar flowing run with depth estimated at more than 2 m (6 ft.). <br />A large eddy was located next to the run and below the riffle on the <br />island side of the channel. Because of an inoperable velocity meter, <br />exact velocity readings were not obtained. However, velocities were <br />estimated to range from 1.8-2.4 m/sec (6-8 ft/sec) in the deep riffle <br />chute. This fast current also made it impossible to safely obtain <br />accurate depth measurements along the channel. Channel substrate <br />consisted of rubble and gravel with some sand deposition within the <br />eddy. <br />Endangered Fish Captures <br />Spawning site captures <br />A floating trammel net pull from river km 26.7-26.4 (mile 16.6-16.4) <br />on August 1 resulted in the capture of two Colorado squawfish (Fig. 16; <br />seine haul B). This was the same area in which the USFWS captured 13 <br />ripe Colorado squawfish on July 5, 1981 (Miller et al., 1983b). These <br />two fish were females in spawning condition. <br />On August 1 at 1210 hrs, two attempts were made to capture radio- <br />tagged fish number 4 with a trammel net pulled seine-fashion from a raft <br />and walked along the shore (Fig. 16, seine haul A). The net was pulled <br />through eddy and run portions of the channel; and seven Colorado <br />squawfish, all in spawning condition, were captured. One of the fish <br />was a possible female [Carlin tag #1863(B)], which had been originally <br />tagged on June 2, 1982, within a man-made backwater at river km 103.0 <br />(mile 64.0). Another less efficiently pulled net resulted in the <br />capture of only two additional Colorado squawfish, both males in <br />spawning condition.