7823

• UCREFRP Catalog Number: 7823
• Author: Miller, W. H., et al.
• Title: Colorado River Fishery Project, Part II, Final Report, Field Investigations.
• USFW Year: 1982.
• USFW - Doc Type: \
• Copyright Material: NO

FIGURES (continued)
Number Page •
23 Depth, velocity and substrate used by 179 adult hump-
back chub from Black Rocks and Westwater Canyon,
1979-1981 . . . . . . . . . . . . . 188
24 Water temperatures and flows associated with spawning
of Gila cypha in Black Rocks, Colorado . . . . . . . 190
25 Mean nuchal hump ratios and fin ray counts for adult
Gila cypha from Black Rocks and Westwater Canyon
and G. cypha x G. robusta from Debeque Canyon . . . . . 194
26 Length-frequency histograms for five groupings of
humpback chub from the upper Colorado River . . . . . . 196
27 Movement of a male Gila cypha in Black Rocks, Colorado,
monitored by radiotelemetry . . . . . . . . . . . . 202
28 River depths and regions occupied by Gila cypha
monitored with radiotelemetry in Black Rocks,
Colorado, May-July 1981 . . . . . . . . . . . . . . . . 204
29 Depth, velocity and substrate used by eight adult
humpback chub equipped with radio transmitters in
Black Rocks, Colorado, 1981 . . . . . . . . . . . . . . 205
30 Locations and numbers of razorback sucker captured in
the upper Colorado River, 1979-1981 . . . . . . . . . . 208
31 Depth, velocity and substrate used by all (n = 52)
razorback sucker (adults) captured in the upper
Colorado River, 1979-1981 . . . . . . . . . . . . . 212
32 Relative abundance of Colorado squawfish compared to
that of the common native and non-native fishes in
the upper Colorado River from Lake Powell, Utah to
Debeque, Colorado, 1979-1981 . . . . . . . . . . . . . . 219
33 Observed spawning periods for selected endangered,
native and nonnative fishes of the upper Colorado
River . . . . . . . . . . . . . . . . . . . . . . . . . 221
3. LIFE HISTORY AND POPULATION ECOLOGY OF THE HUMPBACK CHUB IN
THE LITTLE COLORADO AND COLORADO RIVERS OF THE GRAND CANYON,
ARIZONA
Number Page
1 Map of Study area with locations
of sampling strata . . . . . . . . . . . . . ... . . . . 283
2 Chronology of Little Colorado and Colorado
River 5 day mean water temperatures . . . . . . . . . . 288
3 Mean catch rates for humpback chub collected
by minnow traps and seines during darkness
from Little Colorado River LCR 2, 3, 4, and
confluence stratum, 1980-81 . . . . . . . . . . . . . . 290
4 Mean catch rates for humpback chub collected
by trammel nets during three dial periods
from Little Colorado River strata LCR 2,
3, and 4 . . . . . . . . . . 292
5 Mean catch rates for humpback chub collected
by trammel nets fished overnight in-Colorado
River strata and the confluence stratum . . . . . . . . 293
xiv