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Final Report Fig. 5- 11 . Fig. 5-12. Fig. 5-13. Fig. 6-1. Fig. 6-2. Fig. 6-3. Fig. 6-4. Fig. 6-5. Fig. 6-6. Fig. 6-7. Fig. 6-8. Fig. 6-9. Fig. 6-10. Fig. 6-11. Fig. 6-12. Fig. 6-13. Fig. 6-14. Fig. 6-15. Fig. 6-16. Fig. 6-17. Fig. 6-18. Fig. 7-1. Fig. 7-2. List of Figures . xiii Monthly geometric mean catch per effort (GMcPE' # fish/100 ft/100 hr) for adult humpback chub and rainbow trout captured in nets above the LCR (RM 52.85-60.85) and below the LCR (RM 61.85-65.55) for 1991-93 ................................ 5-31 Displacement of 202 PIT-tagged flannelmouth suckers (>200 mm TL) from capture locations in the Colorado River, Grand Canyon ................................... 5-34 Percentage biomass for fish species in 11 geomorphic reaches of the Colorado River from Lees Ferry to Diamond Creek. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-41 Length-frequency histograms for four major aggregations of humpback chub in the Colorado River, October 1990-November 1993 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-9 Mean total length for adult humpback chub (:2200 mm TL) in four mainstem 8ggregationsin Grand Canyon, 1990-93 ........................................6-10 Length-frequency of individual PIT-tagged humpback chub capture in the LCR (A) (ASU data), in mainstem LCRI aggregation (8), and in both LCR and mainstem LCRI aggregation (C) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12 Length-weight relationship for humpback chub from the Colorado River in Grand Canyon for 1990-91 (A), 1992 (B), and 1993 (C) ..................... . . . . . . . . . . . . . 6-13 Mean monthly relative condition (Kn) of adult humpback chub (~200mm TL) from the Colorado River in Grand Canyon, October 1990 - November 1993 ................... 6-15 Length-weight relationship for males (A), females (B), and combined (C) from the Colorado River in Grand Canyon, October 1990-November 1993 ....................6-16 Length-weight relationships for fJannelmouth sucker (A) and bluehead sucker (B) from the Colorado River in Grand Canyon, October 1990 - November 1993 . . . . . . . . . . . .6-17 Mean monthly relative condition (Kn) for f1annelmouth sucker (A) and bluehead sucker (B) (:2150 mm TL), and for rainbow trout (C) and brown trout (D) (~200 mm TL) from the Colorado River in Grand .Canyon, October 1990-November 1993 .. . . . . . . . 6-18 Total length to scale radius relationship for humpback chub from the Colorado River in Grand Canyon, with (A) and without (B) a specified y-intercept . . . . . . . . . . . . . . . . . . . . . 6-21 Logarithmic growth curve for humpback chub in the mainstem Colorado River in Grand Canyon (A). Hatching length of 7 mm from Muth (1990); length at 1-3 years from scale back-calculations; lengths at 50 mm increments for 4+ years from PIT-tag recaptures. Growth curve for humpback chub in the LCR (B) from Minckley (1992) . . . . . . 6-22 Length-frequency histograms for humpback chub (<200 mm TL) captured in the Colorado River, 1990-93 (A), and for back-calculated lengths from scales of subadult humpback chub taken in the Colorado River (B) .................................. 6-24 Exponential decreases in densities of subadult humpback chub in the mainstem Colorado River from the LCR (RM 61.3) to Lava Canyon (RM 65.4) for September 1991 through March 1992 (A), May through November 1992 (B), and September through November 1993 (C) .................................................. 6-30 Survival rates (s) and length distribution of adult humpback chub in the mainstem Colorado River ............................................................. 6-31 Fecundity of humpback chub, as a relationship between body weight of fish and number of eggs. Data from Hamman (1982) ..................................... 6-35 Percentage of adult humpback chub in spawning condition from monthly samples in the LCR inflow aggregation (A) and eight disjunct mainstem aggregations (B) .......... 6-36 Total length to maximum mouth diameter relationships for three predaceous fish species in Grand Canyon. Brown trout relationship from data presented in Bannon and Ringler (1986); rainbow trout relationship from cutthroat trout equation by Reimchen (1991); channel catfish relationship from data obtained from T. Crowl and L. Alder (pers. comm.); striped bass relationship from Chervinski et al. (1989) ......... 6-38 Potential and actual size of humpback chub consumed by brown trout, based on total length to mouth diameter of predaceous brown trout (A) and total length to body depth of humpback chub (B) ............................................... . . . 6-39 Potential daily and annual consumption of humpback chub by adults of three predator fish species in the Colorado River in Grand Canyon. Relationships assume 2.0 chubs consumed daily by 10.4% of adult brown trout; 1.0 chub consumed daily by 1, 5, or 10% of adult rainbow trout; 1.0 chub consumed daily by 1.5% of adult channel catfish .................... ................................................... ., .6-40 Four levels of fish habitat classification in the Colorado River, Grand Canyon. ........... 7-3 Cross sections of hypothetical shoreline types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-4