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Green River. -River-wide CPE increased from less than 1 CPM/hr in the early years of <br />ISMP to more than 3 CPM/hr in 2000, the last year that samples were taken (Figure 3). <br />Although minor fluctuations occurred, mean CPE increased consistently over the sampling <br />period after remaining about even through the first three years of study. Mean CPE was more <br />variable when divided into upper (1, 2, and 3) and lower (4 and 5) reaches of the Green River, <br />although an upward trend was still evident (Figure 4). Catch rates in the upper Green River. <br />increased substantially in 1989 and 1990, while they decreased in the lower river. Lower river <br />CPE increased steadily through the remainder of the study with highest CPE occurring in <br />2000, In contrast, upper river CPE fluctuated through most of the 1990s, with highest CPE <br />occurring in 1998. Mean CPE dropped in the upper river in 1999 and 2000. <br />5 <br />` 4 <br />a <br />v 3 <br />w <br />a <br />c 2. <br />m <br />~ 1 <br />0 <br /> <br />86 87 88 89 90 91 92 93 94 95 96 97 98 99 00 <br />Year <br />FIGURE 3. -Mean CPE (CPM/hr) of Colorado pikeminnow in the Green River, <br />1986--2000. Vertical bars represent 95% confidence intervals; regression results are <br />provided in Table A-9. <br />9 <br />