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<br />' COLORADO SOLIAWFISH RED SHINER SPECKLED DACE <br />8~ <br />40 <br />0 <br />80 <br />40 <br />0 <br />80 <br />40 <br />0 <br />w <br />U CHANNEL CATFISH SAND SHINER BLUEHEAD SUCKS <br />Z . <br /> W <br /> <br /> ~ 80 <br />U <br /> O <br /> LL <br />~ 40 <br />~ } <br /> <br /> U <br /> W <br /> <br />80 <br />40 <br />0 <br />80 <br />40 <br />0 <br />O <br />~ FATHEAD MINNOW GILA spv. FLANNELMOUTH SUC <br />W <br />80 <br />40 <br />1 <br />0 <br />80 <br />40 <br />0 <br />80 <br />40 <br />0 <br />S I SA GR RU BO S I <br />SA GR RU BO S I SA GR RU BO <br />I SUBSTRATE TAPE <br />Figure 20. Frequency of occurence of nine species of fish at different substrate <br />sizes, Colorado River, 1980. (SI=silt, SA=sand, GR=gravel, <br />RU=rubble, BOAboulder). <br />35 <br />1 <br />~~K <br />