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3.6. Silica concentrations by Colorado River reach and <br />selected tributaries during 1984-86. Mean <br />concentrations as mg/L ..................................41 <br />4.1. Sampling methods used to capture fishes in the <br />mainchannel, April 1984 - June 1986 .....................44 <br />4.2. Scientific and common names of fish captured between <br />April 1984 - June 1986 in Colorado River between <br />Glen Canyon Dam and Diamond Creek .......................48 <br />4.3. Rainbow trout catch per unit effort (Catch/100 min) <br />electrofishing in reaches 10-50 from April 1984- <br />May 1986. N represents the number of electrofishing <br />samples .................................................54 <br />4.4 Electrofishing catch per unit effort (Catch/ <br />100 min) from April 1984-May 1986, all <br />reaches combined ........................................60 <br />4.5 Mean and standard error (SE) of electrofishing <br />catch per unit effort (catch/100 min) of rainbow <br />trout adults and subadults by habitat, substrate, <br />and the presence or absence of vegetation in <br />Reach 10-50. Values in parenthesis () represent <br />n, the number of times each category was sampled. <br />Bold values represent highest catch rate among <br />habitat, substrate, and vegetation categories ......... ..67 <br />4.6. Comparison of rainbow trout electrofishing catch per <br />unit effort (CPUE) and effort (minutes) during <br />steady flow period (winter 1984/85) and a fluctuation <br />period (winter 1985/86) in different habitat types. <br />The number of samples from each habitat type is <br />represented by n ........................................68 <br />-iv-