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FIGURES (continued) <br />• <br /> Number Page <br /> 4 Flow of the upper Colorado River at the Utah-Colorado <br /> state line, 1981 (United States Geological Survey <br /> records) . . . . . . . . . . . . . . . . . . . . . . 106 <br /> 5 Percentage composition of fishes in eleven habitats <br /> of the upper Colorado River, 1979-1981 . . . . . . . . . <br /> 6 Sample strata and river miles associated with capture 126 <br /> sites of Colorado squawfish in the upper Colorado <br /> River . . . . . . . . . . . . . . . . . . . . . . . . . 138 <br /> 7 Relative abundance of Colorado squawfish in the upper <br /> Colorado River expressed as fish per mile for three <br /> age classification . . . . . . . . . . . . . . . . . . . 139 <br /> 8 Distribution of Colorado squawfish by size in the <br /> upper Colorado River, 1979--1981 . . . . . . . . . . . . 140 <br /> 9 Occurrence of young-of-the-year and juvenile squaw- <br /> fish in a backwater at river mile 26.8 on the upper <br /> Colorado River . . . . . . . . . . . . . . . . . . . . . 150 <br /> 10 Depth, velocity and substrate used by 377 young-of- <br /> the-year Colorado squawfish from the upper Colorado <br /> River, 1979-1981 . . . . . . . . . . . . . . . . . . . . 151 <br /> 11 Depth, velocity and substrate used by 34 juvenile <br /> Colorado squawfish 60-229 mm TL from the upper <br /> Colorado River, 1979-1981 . . . . . . . . . . . . . . . 153 <br /> 12 Depth, velocity and substrate used by 105 subadult <br /> and adult Colorado squawfish greater than 230 mm TL <br />• from the upper Colorado River, 1979-1981 . . 154 <br /> 13 Relationships between total length and scale radius <br /> for 14 Colorado squawfish from the upper Colorado <br /> River, 1980-1981 . . . . . . . . . . . . . . . . . . . . 162 <br /> 14 Growth rates for the Colorado squawfish in the Green <br /> 1964766; the Colorado River near Grand <br />River <br /> , <br />Junction, 1974-76; the Yampa-Green Rivers, 1974-76; <br /> upper Colorado River, 1980-81 . . . . . . . . . . . . . 164 <br /> 15 Length-frequency histograms for four groups of <br /> Colorado squawfish from the upper Colorado River . . . . 165 <br /> 16 Locations and numbers of humpback chub captured in <br /> the upper Colorado River, 1979-1981 . . . . . . . . . 167 <br /> 17 Depth, velocity and substrate used by 36 juvenile <br /> humpback chub from the upper Colorado River, <br /> 1979-1981 . . . . . . . . . . . . . . . . . . . . . . 181 <br /> 18 Depth, velocity and substrate used by 12 juvenile <br /> humpback chub from Black Rocks, Colorado, 1979-1981 182 <br /> 19 Depth, velocity and substrate used by 19 juvenile <br /> humpback chub from Westwater Canyon, Utah, 1979-1981 183 <br /> 20 Depth, velocity and substrate used by 184 adult <br /> humback chub from the upper Colorado River, 1979- <br /> 1981 . . . . . . . . . . . . . . . . . . . . . . . . . . 185 <br /> 21 Depth, velocity and substrate used by 136 adult <br /> humpback chub from Black Rocks, Colorado, 1979-1981 186 <br /> 22 Depth, velocity and substrate used by 43 adult <br />• <br />humpback chub from Westwater Canyon, Utah, 1979-1981 . <br />187 <br />xiii