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<br />------------------- <br /> <br />TABLE 12.-FIELD STUDIES ON LARVAL RAZORBACK SUCKER CANYONLANDS NATIONAL PARK AND GLEN <br />CANYON NATIONAL RECREATION AREA - DIET OF ADULT RED SHINER COLLECTED FROM SHAFER AND LATHROP <br />CANYONS ON THE MIDDLE COLORADO RIVER, UTAH, AND MILLARD CANYON AND THE BONITA BEND AREA ON THE <br />LOWER GREEN RIVER, UTAH, IN JUNE 1994. Diet measures by sampling location are mean percentage each food category <br />contributed to total volume of food in each digestive tract (mean of volume percentages) and percentage of all digestive tracts in <br />which each food category occurred (percentage of occurrence). <br /> <br /> <br />Fish larvae 4 4 4 6 13 16 2 3 <br />Insect parts 13 37 27 54 6 25 30 61 <br />Chironomidae larvae 9 12 10 13 6 11 3 13 <br />Simulidae pupae < 1 < 1 4 4 5 12 <br />Corixidae 2 2 <br />Notonectidae < 1 <br />Cladocera < 1 <br />Organic detritus 72 73 59 63 70 62 60 64 <br />Number of fish. N 206 24 26 177 <br />Mean (range) total 59 (40-80) 49 (42-73) 46 (41-71) 47 (40-70) <br />length (mm) <br />Number of fish with 26(13) 4(17) 1 (4) 19(11) <br />empty digestive tracts <br />(percent of N) <br />Mean (range) percent 53 (1-95) 43 (5-95) 63 (10-90) 56 (5-95) <br />fullness of digestive <br />tracts with food <br /> <br />26 <br />