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LIST OF TABLES Table 1. Description of flow and temperature parameters correlated with YOY chub growth and CPE as collected in Westwater canyon of the Colorado River; 1992 -1996 ............. 4 Table 2. Mean total length of YOY chubs collected on select dates, 1992-1994, and 1996, above Westwater Canyon (RK 204 - 199.4) and within the canyon (RK 199.2 - 190.4). Sample size refers to number of individuals; p-value refers to significance of an analysis of variance between the sites .......................................... 5 Table 3. Days post hatch and back-calculated hatching dates for YOY chubs collected above and within Westwater Canyon, Colorado, on selected dates in 1992, 1993, 1994 and 1996. Modal peaks are from respective length frequency analyses ......................... 6 Table 4. Annual mean catch per unit effort (fish / m2) and standard error for each of three Colorado River sampling strata: Above Canyon (RK 204 - 199.4); Canyon (RK 199.2- 190.4); and, Below Canyon (RK 186.4 - 176.8), Utah; 1992-1996 .............................. 7 Table 5. Pearson Correlation coefficients /associated probabilities for YOY chub CPEs vs a variety of flow and temperature parameters (see Table 1 for descriptions). Catch rates are from two sub-reaches (above and within Westwater Canyon) during the months of July and August, 1992-1996 ..................................................... 8 Table 6. Distribution of sampling effort by habitat types in the three sampling sub-reaches. Westwater Canyon, Colorado River; 1992 -1996. Results of sampling in July and August 1992, 1994, and 1996. An additional, early September sampling effort was incorporated in the 1993 and 1995 data sets. See Appendix Table 2 for habitat type descriptions ..... . Table 7. Multinomial analysis for use of habitats by YOY Gila spp. in the Above Canyon sub- reach (Colorado RK 204 - 199.4), Utah. Data collected in July and August, 1992, 1994, and 1996, and July -Sept., 1993 and 1995 ..................................... 10 Table 8. Multinomial analysis for habitat preference by YOY Gila spp. based on actual numbers of fish collected by habitat type in the Above Canyon sub-reach (Colorado RK 204 - 199.4), Utah. Data collected in July and August, 1992, 1994, and 1996, and July-Sept., 1993 and 1995 ................................................. 10 Table 9. Multinomial analysis for use of habitats by YOY Gila spp. in the Westwater Canyon sub- reach (Colorado RK 199.2 - 190.4), Utah. Data collected in July and August, 1992, 1994, and 1996, and July -Sept., 1993 and 1995 ..................................... 11 Table 10. Multinomial analysis for habitat preference by YOY Gila spp. based on actual numbers of fish collected by habitat type in the Westwater Canyon sub-reach (Colorado RK 204 - 199.4), of Westwater Canyon, Utah. Data collected in July and August, 1992, 1994, and 1996, and July -Sept., 1993 and 1995 ................................ 12 iv