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
IFG Study of Physical-Chemical Habitat Conditions
on the Green and Colorado Rivers in Colorado and Utah
Number Page
13 Percent exceedence plots for natural and present
flow levels at Potash reach, Colorado River,
as predicted by the CRSS program . . . . . . . . . . . . . 20
14 Percent exceedence plots for natural and present
flow levels at Ouray Reach, Green River, as
predicted by the CRSS program . . . . . . . . . . . . . 20
15 Percent exceedence plots for YOY squawfish WUA
at Ouray reach, Green River, during June-August . . . . . 22
16 Percent exceedence plots for YOY squawfish WUA during
June-August at Mineral Bottom reach, Green River . . . . . 24
17 Percent exceedence plots for YOY squawfish WUA at
Potash reach, Colorado River, during June-August . . . . . 25
18 Mean monthly discharge-temperature relationships
for May-August at Black Rocks reach, Colorado River . . . 27
19 Mean monthly discharge-temperature relationships
for May-August at Jensen reach, Green River . . . . . . . 27
2. Spawning Behavior, Habitat Selection, and Early
Life History of Northern Squawfish with
Inferences to Colorado Squawfish
1 The St. Joe River, Idaho, below Bluff Creek,
including major tributaries . . . . . . . . . . . . . . . 48
2 Comparison over time of index of the abundance of
northern squawfish on four spawning sites in the
St. Joe River, Idaho, with river temperature and
level (above an arbitrarily chosen zero) . . . . . . . . . 54
3 Comparison over time of index of abundance of
northern squawfish on each of four spawning
sites in the St. Joe River, Idaho . . . . . . . . . 55
4 Locations of nine northern squawfish spawning sites
in the St. Joe River, Idaho, relative to river mile
(above Lake Coeur d'Alene) and gradient . . . . . . . . . 56
5 Depth, average velocity, bottom velocity (5 cm above
substrate), and surface velocity (3 cm below surface)
for nine sites in the St. Joe River, Idaho, where
northern squawfish were observed depositing eggs. . . . . 57
6 Frequency histograms for properties of substrates at
nine sites in the St. Joe River, Idaho, where
northern Squawfish were observed depositing eggs . . . . . 57
7 Depth-contour map (depth in meters) of area sur-
rounding northern squawfish spawning site at river
mile 34 3/4, St. Joe River . . . . . . 59
8 Surface and bottom velocities (in feet per second;
solid and dashed lines, respectively) in the
immediate vicinity of a northern squawfish spawning
site at RM 34 3/4 in the St. Joe River, Idaho . . . . . . 59
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