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<br />Average length was 76 mm (SD ;;::: 40.9). More smallmouth bass were removed in 2005 <br />(n ;;::: 7,642) when effort was highest of all three years (Tables 2 and 8). Annual CPUE <br />of smallmouth bass removed with electric seine at Little Yampa Canyon was 182 fish <br />per hour in 2005, 262 fish per hour in 2006, and 193 fish per hour 2007. At Lily Park, <br />we removed 239 smallmouth bass (5.2 kg) or 159 fish/hour from Lily Park with electric <br />seine on one sample occasion in 2007. <br /> <br />With electric seine we removed seven other nonnative species and one hybrid from <br />Little Yampa Canyon, including: 112 northern pike, 2,187 black bullhead 82 black <br />crappie, 102 bluegill, 26 green sunfish, one Iowa darter, and two largemouth bass <br />(Table 9). No other nonnative species except small mouth bass were removed from Lily <br />Park with electric seine. At Little Yampa Canyon, the number of young northern pike <br />that we removed each year declined over time and the number of black bullhead that <br />we removed increased dramatically, although the increase was primarily due to <br />catching many small yay that had little biomass in 2007. In 2005 we captured the <br />highest number of young centrarchids of any year, including two largemouth bass which <br />most likely escaped from Elkhead Reservoir. <br /> <br />Spawning observations--- Ripe small mouth bass were observed only at Little Yampa <br />Canyon where we captured four ripe males and 12 ripe females from mid-June through <br />early July in all years. Morning temperatures ranged from 16 to 21 DC. During that <br />period we also captured males with abraded ventral median fins in the process of <br />building nests and observed males guarding nests in 2006 and 2007. We increased <br />effort at locations that contained nests in an effort to remove both guarding males and <br />young from nests. Average length of ripe females was 397 mm (SD ;;::: 56) and ripe <br />males was 251 mm (SD ;;::: 137). Ripe fish or nests were observed between river mile <br />108 and 123. <br /> <br />Nest were located in areas with no noticeable velocity, usually side-channel backwaters <br />with gravel and sand substrates. Nest were also observed in the main channel along <br /> <br />15 <br />