6025

• UCREFRP Catalog Number: 6025
• Author: Kaeding, L. R. and D. B. Osmundson.
• Title: Report on the Studies of the Endangered Fishes of the Upper Colorado River As Part of Conservation Measures for the Green Mountain and Ruedi Reservoir Water Sales
• USFW Year: 1988.
• USFW - Doc Type: Second Annual Progress Report.
• Copyright Material: NO

Table 6. Percent species composition of larval samples collected between 16 July
and 28 August 1986, and between 13 July and 28 August 1987, and pooled within three
adjacent river reaches.
Colorado R.
upper 15-miles
Gunnison R.
2-mile reach
Colorado R.
lower 18-miles
1986 1987
1986 1987
1986 1987
Colorado squawfish 0.00 0.00 0.15 0.00 0.16 0.03
Roundtail chub 3.12 6.94 3.53 37.61 2.01 11.55
Bluehead sucker-' 68.45 45.18 76.94 22.87 73.43 30.76
Flannelmouth sucker 2.67 0.49 0.88 1.14 0.74 0.23
White sucker 0.30 0.04 0.29 0.00 0.08 0.00
Unidentified sucker 0.62 0.00 1.18 0.00 1.11 0.00
Green sunfish 0.03 0.15 0.00 0.00 0.02 0.09
Black crappie 0.00 0.00 0.00 0.00 0.18 0.00
Fathead minnow 1.39 7.02 0.15 0.64 5.34 25.88
Red shiner 1.63 18.93 0.15 10.55 1.46 15.85
Sand shiner 1.60 2.20 0.29 3.81 0.45 1.23
Speckled dace 19.97 18.82 15.74 23.38 14.98 14.09
Mosquitofish 0.47 0.19 0.00 0.00 0.00 0.21
Unidentified fish
------------------- 0.12
------ 0.04
--------- 0.15
----------- 0.00
----------- 0.02
----------- 0.09
--------
No. fish 3370 2636 680 787 4867 3420
No. samples 49 42 8 12 58 54
No. fish/sample 68.8 62.8 85.0 63.6 83.9 63.3
a Includes some questionable specimens that the Larval Fish Laboratory tentatively
believes are bluehead sucker; however, until tecEiiques are developed to positively
identify sucker of this size to species, the presence of razorback sucker larvae in
these samples should be considered a possibility.
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