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0 <br />0 • <br />Table 51 <br />AVERAGE NUMBERS AND WEIGHTS OF BOTTOM FAUNA IN SURBER SAMPLES <br />Yampa River <br />(November 1970 to <br />November 1971) <br />Number of <br />Samples <br />Number of <br />Average <br />Individuals <br />Range <br />Total Dry Weight <br />(Grams) <br />Average <br />By Group <br />Range <br />Ephemeroptera <br />58 <br />34.6 <br />7 -220 <br />0,116 <br />.030 -.556 <br />Trichoptera <br />58 <br />22.8 <br />3 -96 <br />0,119 <br />.015 -.517 <br />Plecoptera <br />58 <br />4.4 <br />1 -26 <br />0,029 <br />0 -.152 <br />Diptera <br />58 <br />14.0 <br />3 -36 <br />0.045 <br />trace -.491 <br />Coleoptera <br />58 <br />0.8 <br />0 -2 <br />trace <br />0 -.001 <br />Williams Fork River <br />Total Dry Weight <br />By Group <br />(March and August <br />Number of <br />Number of <br />Individuals <br />(Grams) <br />1971) <br />Samples <br />Average <br />Range <br />Average <br />Range <br />Ephemeroptera <br />13 <br />28.3 <br />1 -134 <br />0.070 <br />.003 -.161 <br />Trichoptera <br />13 <br />16.2 <br />1 -62 <br />0.100 <br />.017 -.393 <br />Plecoptera <br />13 <br />3.1 <br />1 -10 <br />0.015 <br />trace -.143 <br />Diptera <br />13 <br />9.9 <br />1 -54 <br />0.074 <br />.009 -.177 <br />Coleoptera <br />13 <br />0.8 <br />0 -1 <br />trace <br />0 -trace <br />