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<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 /> <br />7 <br /> <br />Results from the Upper Green River were similar to the <br />Colorado (McCada 1991; Figure 5). More squawfish were collected <br />in the first 3 years and captures declined during 1989 and 90. <br />Cranney (1991, personal communication) reported that squawfish <br />captured in the upper Green River were larger, and older than <br />those collected in the lower Green the past 2 years, ranging from <br />250 to 750 mm. <br /> <br />Seven razorback suckers and 5 humpback chubs were also <br />captured during sampling. All 7 razorbacks were caught in the <br />Green River. Humpback chubs were caught in both the Green and <br />Colorado rivers in 1987, 1988 and 1989 (Appendix Table 1.) <br /> <br />Northern pike and walleye were the most common non-native <br />species observed during sampling (Appendix Table 2.). All of the <br />pike, and the majority of the walleye were caught in the upper <br />reach of the Green River. All the northern pike were caught in <br />1988 and 1989, while the walleye were caught in each of the first <br />3 years of sampling. Only 1 each of adult largemouth bass and <br />green sunfish were caught, both in the upper reach of the <br />Colorado River in 1989. These predatory, non-native species have <br />been conspicuously absent from electrofishing collections from <br />the lower reaches of the Green and Colorado Rivers. <br /> <br />Figure 5. Mean CPUE for Adult Colorado <br />Squawfish in Utah, 1986-90 <br /> <br /> <br /> 4 <br /> 3,5 <br />OJ 3 <br />c: <br />~ <br />() <br />0 2.5 <br />~ <br />l/) <br />0 <br />.... 2 <br />t) <br />Cl> <br />W 1,5 <br />w <br />:J <br />a.. 1 <br />() <br /> Lower Green <br /> 0.5 Upper Green <br /> 0 Colorado <br /> 1986 1987 1988 1989 <br />