9299

• UCREFRP Catalog Number: 9299
• Author: Anderson, R. and J. Mumma.
• Title: Aspinall Studies
• USFW Year: 1999.
• USFW - Doc Type: Annual assessment of Colorado Pikeminnow Larval Production in the Gunnison and Colorado Rivers, Colorado 1992-1996.
• Copyright Material: NO

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Table 2. Species composition of fish collected at all study sites in the Gunnison
River between 1992 and 1996.

YEAR STATION NATIVE CPM BH CH FM SD
1992 LOWER 75.5% 0.1% 9.3% 59.1% 1.5% 5.4%
1993 LOWER 89.4% 0.0% 13.9% 63.4% 6.5% 5.6%
1993 ABOVE-DAM 80.2% 0.0% 14.9% 58.9% 3.4% 2.9%
1994 LOWER 16.7% 0.0% 0.9% 7.4% 0.2% 8.3%
1994 ABOVE-DAM 20.5% 0.0% 1.9% 14.8% 0.5% 3.2%
1994 BRIDGEPORT 91.1% 0.4% 11.7% 68.5% 6.5% 4.0%
1995 LOWER 97.7% 0.1% 27.3% 55.6% 1.1% 13.6%
1995 ABOVE-DAM 52.5% 0.2% 14.7% 34.4% 1.1% 2.2%
1995 BRIDGEPORT 97.9% 0.5% 34.7% 41.7% 2.6% 18.2%
1996 LOWER 75.3% 0.4% 17.9% 41.4% 5.9% 9.8%
1996 ABOVE-DAM 93.3% 1.7% 21.1% 48.3% 18.3% 3.9%
1996 BRIDGEPORT 97.4% 0.6% 30.1% 36.5% 17.9% 12.2%
YEAR STATION NONAT CP FH GS SIllNER WS
1992 LOWER 21.7% 20.7% 0.5% 0.0% 0.6% 0.0%
1993 LOWER 10.6% 9.2% 0.0% 0.0% 0.1% 1.0%
1993 ABOVE-DAM 19.8% 19.6% 0.0% 0.0% 0.1% 0.1%
1994 LOWER 77.2% 35.0% 5.2% 5.4% 31.5% 0.0%
1994 ABOVE-DAM 77.9% 73.3% 1.0% 1.3% 2.3% 0.0%
1994 BRIDGEPORT 8.5% 7.7% 0.8% 0.0% 0.0% 0.0%
1995 LOWER 2.0% 0.3% 1.3% 0.1% 0.2% 0.2%
1995 ABOVE-DAM 47.2% 0.1% 44.9% 2.2% 0.0% 0.1%
1995 BRIDGEPORT 1.8% 0.4% 0.4% 0.4% 0.0% 0.7%
1996 LOWER 22.2% 16.8% 1.0% 0.0% 1.2% 3.3%
1996 ABOVE-DAM 6.1% 1.7% 2.8% 0.0% 0.0% 1.7%
1996 BRIDGEPORT 2.6% 0.0% 0.0% 0.0% 0.0% 2.6%

Colorado Pikeminnow - Total Catch

A total of 503 endangered Colorado pikeminnow larvae were caught from all
stations during the study (Appendix. 1, Tables 1-6). Loma was the station with the most
pikeminnow, 406 total (Appendix 1, Table 1). Loma was the only station that produced
enough Colorado pikeminnow in each year to show trends during the study period. The
Middle station on the Colorado River, which ran for three years had a total larval
pikeminnow catch of78 (Appendix 1, Table 2). Only three pikeminnow were collected
from the Upper Colorado River station during the five years it was sampled and all in
1995 (Appendix 1, Table 3).

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