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Table 12. Total number collected, % species composition (%), and mean catch-per-unit-effort (CPUE, fish/100 m2) for selected spe- --_ cies from backwaters of the San Juan River, Utah, September 9-13, 1987 by three geomorphologic areas of the rivers. ~ Calculations are based on the first seine hauls of back- waters. % values were calculated using the total number of fishes seined in each geomorphologic area. Total fishes seined in 4-Corners to Sand Isl. = 2227; Sand Isl. to Mex. Hat = 28, and Mex. Hat to Grand Gulch = 99. r General River Area River Miles Statistics Species ----------------------- -------------------------------------------- ~ 4-Corners to Sand Isl. red fathead sand channel 136.2 - 78.0 shiner minnow shiner suckersb catfish Total No. 1160 502 129 133 6 % 52 22 6 6 0.3 Mean CPUE 97.9 44.6 11.8 10.7 0.4 St. Dev. 208.1 85.9 44.6 18.9 1.3 . N=29 Sand Isl. to Mex. Hat 78.0 - 60.0 Total No. 14 9 1 0 0 1 % 50 32 4 0 0 Mean CPUE 12.5 7.3 6.2 0 0 St. Dev. 21.7 12.2 10.8 0 0 N=4 Mex. Hat to Grand Gulch ~ 60.0 - 16.0 Total No. 22 72 0 1 1 % 22 73 0 1 1 Mean CPUE 34.2 124.2 0 1.0 0.8 St. Dev. 25.7 153.1 0 2.2 1.9 N=5 . sSeining catches of fishes from backwaters is presented for each 5-mi reach in Appendix D. bFlannelmouth sucker, bluehead sucker, and unidentified sucker combined. ~ s - 32 - 7