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Table 1. Locations of sample reaches within Colorado River strata sampled for Colorado <br />squawfish native food fishes. Locations are described as river-kilometers upstream of the <br />confluence of the Green River. Stratum No. 4 was not sampled (see text). <br />Stratum No. Ave Gradient Strata locations Reach No. Reach locations <br />(mom) (km) (km) <br />01 0.21 0.0-112.6 1 5.2-6.0 <br /> 2 12.2-13.0 <br /> 3 20.9-21.7 <br /> 4 30.1-30.9 <br /> 5 61.6-62.4 <br /> 6 100.6-101.4 <br /> 7 103.5-104.3 <br />02 1.33 112.6-140.6 8 121.3-122.1 <br /> 9 129.0-129.8 <br />03 0.61 140.6-181.0 10 148.5-149.3 <br /> 11 156.6-157.4 <br /> 12 172.2-173.0 <br />04 2.42 181.0-200.0 - - <br />05 0.91 200.0-245.5 13 212.9-213.7 <br /> 14 228.0-228.8 <br /> 15 234.6-235.4 <br />06 1.27 245.5-275.1 16 252.9-253.7 <br /> 17 270.0-270.8 <br />07 1.70 275.1-298.1 18 287.2-288.0 <br /> 19 293.8-294.6 <br />Trammel-net CPUE, the mean number of each species caught per net set, was also <br />summarized by strata. Netting data were from the nets set for Colorado squawfish as <br />described above. Collection of netting data for fishes other than Colorado squawfish began in <br />1992 and continued through 1994. Numbers of each species per net was recorded; except for <br />Colorado squawfish, lengths of trammel-netted fish were not taken. <br />To develop an overall index of relative abundance of native fish, we pooled within each <br />sample the number caught of the three common species, bluehead sucker (C. discobolus), <br />flannelmouth sucker (Catostomus latipinnis), and roundtail chub (Gila robusta). Because of <br />the deep bodies of common carp (Cyprinus carpio) and the spines of channel catfish <br />(Ictaluras punctatus) these two species were assumed to be largely unavailable as forage <br />items for Colorado squawfish. We assumed white suckers were available because, like native <br />species, they are soft rayed and fusiform shaped. However, we analyzed these separately. <br />B-7