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4.11. Mean and standard error (SE) of electrofishing catch per unit effort (catch/100 min) of flannelmouth sucker adults and subadults by habitat, substrate, and the presence or absence of vegetation in Reach 10-50. Values in parentheses () represent n, the number of times each category was sampled. Bold values represent highest catch rate among habitat, substrate, and vegetation categories .................... 75 4.12. Mean and standard error (SE) of electrofishing catch per unit effort (catch/100 min) of humpback chub adults and subadults by habitat, substrate, and the presence or absence of vegetation in Reach 10-50. Values in parentheses () represent n, the number of times each category was sampled. Bold values represent highest catch rate among habitat, substrate, and vegetation categories .................... 76 4.13. Mean depth and velocity for larvae, fry and other small fishes collected with larval seine in mainchannel Colorado River ..............................78 4.14. Frequency and percent M occurrences of nearshore river habitats at high and low flows, from Anderson et al. (1986) ...........................................81 4.15. Frequency and percent (%) occurrence of nearshore river substrates at high and low flows, from Anderson et al. (1986) ..................................82 4.16. Percent occurrence of dominant habitat classes (greater than 10% of all habitats) defined by nearshore habitats and shoreline substrates for high and low flows at selected reaches, from Anderson et al. (1986)............,k> ....... o83 -vi-