7908

• UCREFRP Catalog Number: 7908
• Author: Valdez, R. A. and R. J. Ryel.
• Title: Life History and Ecology of the Humpback Chub ‎(
• USFW Year: 1995.
• Copyright Material: NO

viii . List of Tables

Final Report

Table 6-5. Summary of back-calculated total length (mm) at each annulus (A~ and transition
check (T J, based on the linear regression formula: TL=34+12.7 (Sr), for 84
humpback chub collected from the mainstem Colorado River in Grand Canyon, 1992-

93. "",.'.,..,..,..........,.,...'".........................,.........., 6-22
Table 6-6, Growth rates of humpback chub (:2150 mm TL) in the mainstem Colorado River by
50-mm length intervals, based on recapture of PIT-tagged fish, October 1990 -
November 1993. Data are compared to growth rates reported by Minckley (1992) . , . . . . . 6-23
Table 6-7. Estimated numbers (N) and 95% confidence intervals (C.I.) of adult humpback chub
(:2200 mm TL) in nine mainstem aggregation, . . . . . . . , . . . . , . . , . , . . . . . , . . . . . . . . . . . . 6-25
Table 6-8. Estimated population (N) of adult humpback chub (:2 200 mm TL) in the LCRI
aggregation using 11 estimators for closed population models . . . . . . . . . , . . . . , . . . , . . . . 6-26
Table 6-9. Estimated total population (N) and survival (S) for adult humpback chub (:2 200 mm
TL) for the LCRI aggregation for 13 seasonal periods, 1991-1993, using estimators
for open population models A, B, and 0 , . . , , . . . . . . . . . . . , , . . . . . . . . . . . . . . . . . . . . . . . 6-27
Table 6-10. Estimated population (N) of adult humpback chub (:2 200mm TL) in the MGG
aggregation using seven estimators for closed population models . . . . . . . . . . , . . . . . . . . . 6-29
Table 6-11, Estimated population (N) of adult humpback chub (:2 200mm TL) in four aggregations
in the mainstem Colorado River in Grand Canyon ,.... . . . , . . , . . . . . , . . . .. . . . . . . . . . 6-29
Table 6-12. Exponential decreases in density of subadult humpback chub (<200 mm TL) for
electrofishing, seines, and minnow traps in the mainstem Colorado River from the
LCR (RM 61,3) to Lava Canyon (RM 65.4) . . , . . . . . . , . . , , . . . . , . . . . . . . . . . . . . . . . . . . .6-31
Table 6-13. Estimated total population size (N) of adult humpback chub (>300 mm TL) in the
LCRI aggregation. Annual estimates of N are shown for 1991, 1992 and 1993. Mean
estimates are also shown for 1991-1993 .,..,............................,.."..6-32
Table 6-14. Estimated population size (N) of adult humpback chub (200-300 mm TL) in the LCRI
aggregation. Annual estimates of N are shown for 1991, 1992 and 1993. Mean
estimates are also shown for 1991-1993, and for 1991 and 1993 (excluding 1992)

combined .............,.................................................,. 6-32
Table 6-15. Estimated total population size (N) of adult humpback chub in the LCRI aggregation
by combining estimates for chubs 200-300 mm (Table 6-14) and greater than 300
mm TL (Table 6-13). Combined estimates are sum of means of each group.
Estimates are shown for all years, 1991-1993 and without 1992. . . . . . . . . . . . . . . . . . . . . .6-33
Table 6-16. Sex ratios for adult humpback chub (:2200 mm TL) from three major aggregations in
the Colorado River in Grand Canyon, October 1990 - November 1993. .........,.....6-34
Table 6-17. Average total length (TL in mm) and weight 0NT in g) for adult male (M) and female
(F) humpback chub (:2 200 mm TL) from the Colorado River in Grand Canyon,
October 1990 - November 1993 ............................................... 6-34
Table 6-18. Number of eggs per female and corresponding lengths and weights of humpback
chub reported by different investigators. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . 6-35
Table 6-19. Spawning condition of adult humpback chub in nine aggregations in the Colorado

River ..,..,..........,....................................".............. 6-36
Table 6-20. Sizes of four predaceous fish species and susceptible sizes of humpback chub . . . . . . . . . 6-40
Table 7-1, Shoreline types and definitions associated with fish habitat of the Colorado River in

Grand Canyon. ...........................................,.................. 7-5
Table 7-2. Fish macrohabitat types and definitions for the Colorado River in Grand Canyon. . . . . . . . . . 7-f3
Table 7-3. Habitat map sites for the Colorado River in Grand Canyon with flows and dates in
which maps were rendered, . . , . . . . . , . . . . , , . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-7
Table 7-4. Modified Wentworth classification for substrate particle sizes (Cummins 1962). ......,... 7-9
Table 7-5. Geomorphic attributes of the river channel and numbers (percentage of total) of
adults captured in areas occupied by nine aggregations of humpback chub. . . . . . . . . . . . . 7-11
Table 7-6. Number and percentage (%) of humpback chub captured and radio contacted in
offshore and nearshore macrohabitats compared to surface area of macrohabitats,

RM 57-65.4,1990-93 ,....................................................... 7-13
Table 7-7. Characteristics and attributes of bathymetry for four eddy complexes in the Colorado

River, Grand Canyon. . . . . . . . . . . . . . . . . . . . . . . . , . . . . . . .. . . . . . . . . .. . . . . , . . . . . . . . . 7-19
Table 7-8. Sample dates, times, flow, and temperature of the mainstem and LCR for
development of temperature isopleths in the LCR inflow. ......................,.... 7-20
Table 8-1. Effort expended for telemetry surveillance and observation of radio-tagged adult
humpback chub of the LCRI and Middle Granite Gorge (MGG) aggregations . . . . . . , . . . . . 8-2