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600 <br />?-o <br />O IT-- <br />N11 <br />Z5 500 <br />-00 <br />E? <br />z 400 <br />3 <br />00 <br />o:3 <br />~U 6 <br />'0? <br />mo <br />0a 4 <br />w 0 <br />o 2 <br />U <br />0 <br />-Reach 1 <br />r-0.50,pa.67 <br />° <br />° <br />.2 .3 .4 .5 <br />Reach 2 <br />r-0.52,p=.65 <br />° <br />° <br />2700 <br />1800 <br />900 <br />0 <br />2100 <br />1500 <br />900 <br />300 <br />Reach 3 <br />r-0.99,p=.09 <br />° <br />° <br />.0 1 2 3 <br />° <br />° <br />Reach 4 <br />° rs0.89,p=.30 <br />.002 .006 .01 0 .4 .8 <br />Geometric-Mean CPE (CS/10 m2) <br />Figure 6. Relationship between Geometric-mean CPE and total number of YOY Colorado <br />squawfish within ISMP reaches (the sum of [Total CPE x total backwater area] for all <br />10-mile intervals within each reach) in the Colorado and Green rivers, 1989 to 1991. <br />DISCUSSION <br />Aerial video has provided useful information about the distribution, size, and abundance <br />of backwaters within the four ISMP reaches. It has also provided considerable information <br />about other physical parameters that were not summarized in this report. However, this <br />analysis is directed solely at examining whether knowledge of backwater area improves the <br />quality of YOY Colorado squawfish trend data collected every fall. As was mentioned <br />earlier, ISMP participants were concerned that CPE data alone might give misleading <br />information about abundance of YOY Colorado squawfish. It was possible that a high CPE <br />value could come from relatively few Colorado squawfish concentrated in limited habitat. <br />Reaches with more habitat and a lower CPE could actually contain more Colorado squawfish <br />than a reach with a higher catch rate. The following examples illustrate the primary <br />concerns: <br />16 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1 <br />1