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spring between RM 1.3 and RM 14.3. In 1997, sampling began 4 June and ended 31 ~ July, and a total of 941ight traps sets were made (Table 9). In 1998, sampling began 27 May and ended 23 July, totaling 93 sets (Table 18, Figure 3). Larval fish from these samples were sent to the Larval Fish Laboratory (LFL) at Colorado State University for identification and enumeration. Drift nets. Conical drift nets (4 m long, 0.15 m2 mouth opening, and 560 um mesh) were set just below the water surface in flowing water, typically less than 1 m deep. A bank of three drift nets was set for two hours, twice each week, after light traps had been collected. In 1997, 51 drift net samples were set (Table 9); the samples were preserved in alcohol for later examination and counting in the laboratory. In 1998, a total of 27 drift nets were set (Table 18 Figure 3). Larval seinins. In 1998, 171arval seine samples were collected RM 1.4 - 14.3 between 2 June and 23 July in backwater habitats. Four samples were sent to the LFL for identification. Post-Larval Sampling Post-larval seinins. Post-larval seining (4 m long by 1 m deep and 3 mm ace-mesh) was done in backwater habitats in the Myton, Uinta, and Ouray sites during base flow periods. In 1997, three sampling trips were completed betweenl2 August and 28 September. In 1998, four trips were completed between 28 July and 10 September (Figure 3). Physical measurements of seined habitats were also collected. Radio Telemetry Radio transmitters were implanted in five Colorado pikeminnow and one razorback sucker between 4 June and 19 June 1997 and six additional Colorado pikeminnow between 15 May and 4 June 1998. Aerial flights and ground monitoring approximately weekly from 19 June through 30 September 1997 and intermittently thereafter followed the 1997 fish. Fifteen flights were completed between 19 June 1997 and 3 Mazch 1998. Most flights covered the Duchesne River between its confluence with the Green River and Myton and the Green River between Split Mountain and Three Fords. In addition to aerial flights, a number of ground monitoring trips with araft-mounted receiver were completed. Two fish telemetry monitoring stations were installed on the Duchesne River to monitor movement of radio tagged fish. The Ouray station was installed at RM 1.8 in August 1997. And the Randlett station was installed at the confluence of the Duchesne and Uinta rivers (RM 14.3) in February 1998. These dataloggers record the date, time, direction, and radio frequency of radio tagged fish that pass by the station. Two Colorado pikeminnows that remained in the Duchesne River during summer of 1997 were tracked over 24-hours for habitat use data. Fish with radio frequency 40.323 MHz was tracked 14-15 August 1997 neaz RM 12.9, and fish 40.303 MHz was tracked 19-20 August 1997 9