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radiotagged fish were detected at a particular location (an indication of pre- <br />spawning or spawning activities in that area), trammel nets were actively <br />fished (drifted) to determine if other Colorado squawfish were present. <br />Reference stations were established in suspected spawning areas (Yampa River: <br />RM 18.2 (RK 29), RM 16.5 (RK 26) and Green River: RM 154.5 (RK 247), RM 156.2 <br />(RK 250)) and sampled in subsequent yea r. s. This program was continued through <br />1985. <br />General temperature and discharge information was obtained for <br />prespawning, migratory and spawning periods for adult Colorado squawfish by <br />field observation, hand-held thermometers, thermographs and USGS gauging <br />station records. <br />IMPACT OF FLOW ON COLORADO SQUAWFISH NURSERY HABITAT <br />The Green River section between Jensen and Ouray, Utah was selected in <br />1980 for evaluating effects of peaking flows from Flaming Gorge Dam on the <br />survival and rearing of YOY Colorado squawfish. Previous studies found young <br />Colorado squawfish to be relatively common in certain habitats in this river <br />section. Aerial photographs of this area were taken at both high and low <br />flows in 1983 to correlate changes in Colorado squawfish nursery habitat with <br />flow volume. Also associated with the flow versus habitat work was an <br />evaluation of flow time from Flaming Gorge Dam to the study area. Key areas <br />at Ouray and Jensen, Utah were monitored with staff gauges and photos to <br />determine timing, duration, and magnitude of flooding and dewatering of <br />shallow habitats resulting from short term changes in 3ischarge from Flaming <br />Gorge Dam. <br />14 <br />