7202

• UCREFRP Catalog Number: 7202
• Author: Osmundson, D. B. and L. R. Kaeding.
• Title: Studies of Colorado Squawfish and Razorback Sucker Use of the '15-Mile Reach' of the Upper Colorado River as Part of Conservation Measures for the Green Mountain and Ruedi Reservoir Water Sales
• USFW Year: 1989.
• USFW - Doc Type: Final Report.
• Copyright Material: NO

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M 0.8
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1986
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0 0.2
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00-15 CO-18 00-15 CO-18 00-15 00-18 GU-2.2 00-15 00-18 GU-2.2
COLORADO SOUAWFISH RAZORBACK SUCKER 001-ORAUO SOUAWFISH RAZORBACK SUCKER
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OD-15 CO-18 GU-2.2 00-15 CO-tB GU-22 00-18 GU-2.2 CO-15 CO-18 GU-2.2
COLORADO SOUANFISH RAZORBACK SUCKER COLORADO SOUAWFISH RAZORBACK SUCKER
0
Figure 2. Electrofishing catch per effort for Colorado squawfish and
razorback sucker in three contiguous river reaches during spring, 1986,
1987 and 1988. River reach codes: CO-15 = Colorado River 15-mile reach
(RM 171-185); CO-18 = Colorado River 18-mile reach (RM 153-171); GU-2.2 =
Gunnison River 2.2-mile reach (RM 0.8-3.0). Note: the Gunnison River was
not sampled in 1986.
section (RM 174.4-175.7) of the 15-mile reach during spring and to the
plunge pool of the Gunnison River during summer. Radio-tracking data on
the movement of adult Colorado squawfish, reported below, also support
this conclusion. In 1988, however, extremely low flows in the lower
Gunnison apparently precluded use of this reach by Colorado squawfish:
extensive electrofishing (as well as radiotelemetry) effort failed to
reveal the presence of any individuals there during July-October. No
razorbacks were seen in the lower Gunnison during our sampling efforts in
either year.
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