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 S uawfish, Continued
Number Page
9 Depth-contour map (depth in meters) of area surrounding
northern squawfish spawning site at river mile
4614j St. Joe River . . . . . . . . . . . . . . . . . . . 60
10 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 4614 in the St. Joe River, Idaho . . . . . . . 60
11 Depth-contour map (depth in meters) of area surrounding
northern squawfish spawning site at river mile 51,
St. Joe River . . . . . . . . . . . . . . . . . . . . . 61
12 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 51 in the St. Joe River . . . . . . . . . . . 61
13 Movements of tagged northern squawfish in a portion
of the St. Joe River between dates of tagging
and recapture or observation . . . . . . . . . . . . . . 64
14 Length-frequency distribution of northern squawfish
collected by gill and trammel net from the St. Joe
•
15 River in 1980 and 1981 . . . . . . . . . . . . . . . . .
Length-frequency distribution of northern squawfish 64
collected from the St. Joe River during spawning
seasons in 1980 and 1981 . . . . . . . . . . . . . . . . 65
16 Gonad weights as a function of fork length for male
(dots) and female (pluses) northern squawfish
collected just prior to spawning in the St. Joe
River during 1980 and 1981 . . . . . . . . . . . . . . . 67
17 Frequency of occurrence histograms for observed
habitat preferences and activity patterns of
young-of-the-year northern squawfish . . . . . . . . . . 70
18 Frequency of occurrence histograms of schools of
young-of-the-year northern squawfish over a range
of depths and velocities and within given distances
of other species of fish . . . . . . . . . . . . . . . . 71
19 Frequency of occurrence histograms of schools of
young-of-the-year northern squawfish over a range
of proportions composed by each of four substrate
particle size classes . . . . . . . . . . . . . . . . . 72
20 Distribution of young-of-the-year northern squawfish
in the lower fastwater reach of the St. Joe River,
Idaho, during summer low flows in August and September 73
21 Frequency of occurrence histograms of schools of
juvenile northern squawfish over a range of values
for a series of behavioral and habitat characteristics 76
22 Frequency of occurrence histograms of schools of juve-
nile northern squawfish over a range of depths and
velocities and within given distances of other species
of fish . . . . . . . . . . . . . . . . . . . . . . . . 77
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