7824

• UCREFRP Catalog Number: 7824
• Author: Miller, W. H., et al.
• Title: Colorado River Fishery Project, Part III, Final Report, Contracted Studies.
• USFW Year: 1982.
• USFW - Doc Type: \
• Copyright Material: NO

FIGURES, Continued
•
Spawning Behavior, Habitat Selection, and Early
Life History of Northern Squawfish with
Inferences to Colorado Squawfish, Continued
Number
36 Depth (cm) and average velocity (fps) contours in
artificial stream channel A . . . . . . . . . . . . . . .
37 Depth (cm) and average velocity (fps) contours in
artificial stream channel B . . . . . . . . . . . . . . .
38 Depths and velocities (dots) preferred by northern
squawfish in artificial stream channels . . . . . . . . .
39 Depths and velocities (dots) preferred by Colorado
squawfish in artificial stream channels . . . . . . . . .
40 Depths and velocities (dots) preferred by northern
squawfish when redside shiners were also present in
artificial stream channels . . . . . . . . . . . . . . .
41 Depths and velocities (dots) preferred by Colorado
squawfish when redside shiners were also present in
artificial stream channels . . . . . . . . . . . . . . .
5. Tolerance and Preferences of Colorado River
Endangered Fishes to Selected Habitat Parameters
1 Electronic shuttlebox for thermal preference
• studies (after Neill et al. 1972) . . .
2 The TDS gradient device with positions of density/TDS
interfaces and location of airstones. Length = 2.4 m,
width = 45.7 cm, height = 30.5 cm . . . . . . . . . . . .
3 Relative frequency distribution of temperatures selected
by razorback suckers. Pooled 15-minute data during
second day and night for fish acclimated to 80, 140,
200, and 260 C. Numbers above each vertical bar
provide day (D) and night (N) range of individual
modes, mean of individual modes + 2 standard errors
(darkened box) and + 1 standard deviation (clear box) .
4 Humpback chub relative frequency distribution in 8
locations within a horizontal thermal gradient chamber.
(Fish were acclimated to 140 C and placed in chamber
with a uniform water temperature of 140 C). Data on
10 fish pooled for first hour, one observation/
minute . . . . . . . . . . . . . . . . . . . . . . . . .
5 Relative frequency distribution of selected temperatures
by humpback chubs. Data pooled for first hour, one
observation/minute for fish acclimated to 140, 290
and 260 C . . . . . . . . . . . . . . . . . . . . . . . .
6 Relative frequency distribution of selected temperatures
by bonytail chubs. Data pooled for first hour, one
observation/minute for fish acclimated to 140, 200,
and 260 C . . . . . . . . . . . . . . . . . . . . . .
• 7 Relative frequency distribution of selected temperatures
by hybrid humpback-roundtail chubs acclimated to 200 C.
Data pooled for first hour, one observation/minute . . .
Page
102
103
105
106
107
108
188
192
196
199
201
203
204
xv