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middle Green (0.95, n = 4) and lower Green (0.99, n = 3) rivers, and moderately strong for the <br />White River (0.85, n = 4) and Yampa River (0.67, n = 4). <br />Length-weight and length frequency analyses.--Mean TL of adult Colorado pikeminnow <br />remained essentially the same in each period, 548 mm in the 1991 to, 1999 period (SD = 71.2) and <br />544 mm (SD = 67.9) in the 2000 to 2003 period. As expected, mean TL of Colorado <br />pikeminnow recruits was similar in each period, 428 mm in the 1991 to 1999 period (SD =14.5) <br />and 430 mm (SD = 15.9) in the 2000 to 2003 period. Analysis-of-covariance (ANCOVA) <br />showed that length-weight relationships for the two groups of fish were statistically significantly <br />different (df = 2, 1786, F = 23,437.8, p < 0.0001, RZ = 0.962). The loge length - loge weight <br />relationships estimated for Colorado pikeminnow 127 to 859 mm TL follow. <br />1991 to 1999, loge WT = -12.34384659 + 3.10104192*loge TL <br />(SE intercept = 0.08939953, SE slope = 0.01460265) and, <br />2000 to 2003 group loge WT = -12.34384659 + 3.09116143*loge TL <br />(SE intercept = 0.08939953, SE slope = 0.01433866). <br />Differences in predicted weight for a hypothetical 600-mm TL Colorado pikeminnow showed <br />that a fish from 2000 to 2003 was 1686 g, or about 6.5% less than a fish of the same length from <br />1991 to 1999 (1796 g). <br />Total length of Colorado pikeminnow captured from 2000 to 2003 ranged from 30 to <br />1,240 mm. Average TL of all captured and recaptured Colorado pikeminnow included in <br />capture-recapture analyses was 499.4 mm (SD = 103.3, n = 3,866). The largest Colorado <br />pikeminnow captured was from the White River, and it, along with two other individuals 900- <br />mm and 980-mm TL, were the only fish captured > 900-mm TL. <br />37