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L ~ <br />3 Miller et al 1982b <br />4 Valdez et al 1982a <br />S Valdez et al 1982b <br />As a rough comparison between the Green and Upper Mainstem Colorado basins, <br />each of the four nonroverlapping studies in Table 1 were reduced to catch per <br />year, and summed for each respective basin. Catch per year for Colorado <br />squawfish was 2718 young, 221 juveniles, and 221 adults for the Green; and <br />169 young, 36 juveniles, and 59 adults for the Colorado sub-basins, <br />respectively. Because these numbers reflect only approximate values, my <br />conclusion is that the Green River Basin has about one order of magnitude more <br />Colorado squawfish of every life stage than the Upper Colorado River Main <br />Stem. <br />The relative proportion of the above values is supported by 2 years of <br />interagency collections of adult fish by spring electrofishing, 1987 and 1988 <br />(USFWS 1987, 1988). These collections were made in areas of highest density <br />adult and young populations, as identified in Archer et al 1986, and USFWS <br />1988b. If the catch of Colorado squawfish are averaged for these two years, <br />the catch in the Green River= 1.01, and the Colorado River=0.31 Colorado <br />squawfish per hour shocking time. In addition, fall seining in prime nursery <br />habitat in the Green Rivera26.5 young,and the Colorado Rivera 7.0 young <br />Colorado squawfish per 100 m2 (USFWS 1987,1988). Although difficult to compare <br />catches of fish in the smaller tributaries with the mainstream rivers, catches <br />14 <br />