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<br />habitat availability and fish had more options for habitat selection. Areas with a high number <br /> <br />(50-150) offlannelmouth suckers at 70 cfs, contained no flannel mouth during subsequent <br /> <br /> <br />higher flows. Also it appeared catfish responded to the higher flows by shifting habitats and <br /> <br /> <br />movements in and out of the study site. Therefore it is believed that the low flow conditions <br /> <br /> <br />in 2000 biased species composition independently of habitat composition in the Lily Park site. <br /> <br /> <br />To confirm species composition for this station it will be sampled again in the 2001 field <br /> <br />season along with the other two Yampa sites. <br /> <br /> <br />Species composition of fish less than 15 cm also was highly variable between stations. <br /> <br /> <br />Lily Park had the fewest number of small fish (174) and Duffy the highest number (937) in <br /> <br /> <br />the sample (Table 2). Small mouth bass YOY was the species with the highest percent <br /> <br /> <br />composition at Lily Park and Duffy, but their numbers were much higher at Duffy. Sand <br /> <br /> <br />shiner was the most common small fish sampled or observed at Sevens during the 2000 <br /> <br /> <br />electrofishing operation. Few speckled dace were observed at all stations in 2000 and mottled <br /> <br /> <br />sculpin were only common at Lily Park. Creek chub and green sunfish were collected for the <br /> <br /> <br />first time in the Yampa River during the study at Duffy. <br /> <br />COLORADO RIVER FISH SAMPLES <br />Percentages of fish over 15 cm captured by electrofishing in the 15-mile reach were <br /> <br />fairly consistent between years and between stations at both Com Lake and Clifton. The 1999 <br /> <br />data at Clifton represents only two electrofishing passes and that data was presented in last <br /> <br />years progress report (Anderson and Stewart 2000). The most noticeable shift was that <br /> <br />flannel mouth sucker was the most common fish caught at both sites in 1999, but bluehead <br /> <br />suckers was the common species in 2000 (Table 4). Native fish comprised 76% and 72% of <br /> <br />the catch at the Corn Lake station in 1999 and 2000, respectively. At Clifton native fish <br /> <br />24 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />