9532

• UCREFRP Catalog Number: 9532
• Author: Anderson, R. and G. Stewart.
• Title: Riverine Fish Flow Investigations.
• USFW Year: 2000.
• USFW - Doc Type: Fort Collins.
• Copyright Material: NO

tlannelmouthcross and carp but in 1999 it was catfish, carp, the white-flannel mouth cross and

roundtail chub (Table 1). Non-native fish predators (pike, catfish, and bass) were 9% of the

catch in 1998 and 11% in 1999. Native fish comprised 72% of the total in 1998 and 68 % in

1999. Colorado pikeminnow were only 0.1% of the catch in 1998 and 0.2% in 1999.

Table 1: Species composition for fish> 15 cm at the Sevens station in 1998 and 1999.
Column 4 is for the study area that has habitat availability data.

1.TOTAL 2. UPPER 3. ABOVE 4. SURVEY 5. BELOW 6. Total
Columns SECTION STUDY STUDY STUDY Areas
2,3,4&5 (1998 Qn1y) AREA AREA AREA 3,4&5
Species 1998 ELECTFOFISlDNG
Flannelmouth Sucker 44.7% 41.6% 48.1% 45.6% 47.2% 47.0%
B1uehead Sucker 20.9% 20.9% 20.7% 12.7% 35.1% 21.0%
Roundtail Chub 6.0% 6.4% 6.3% 7.2% 2.0% 5.7%
Colo. Pikeminnow 0.1% 0.0% 0.3% 0.2% 0.0% 0.2%
White sucker 11.2% 13.0% 7.3% 15.1% 5.5% 9.8%
White X F1annelmouth 5.4% 8.9% 2.8% 4.0% 1.2% 2.9%
White X Bluehead -0.4% 0.5% 0.2% 0.4% ~. 0.6% 0.3%
Channel Catfish 5.9% 5.1% 7.8% 5.6% 5.2% 6.4%
Carp 2.9% 1.6% 4.5% 4.8% 1.4% 3.9%
Smallmouth Bass 0.9% 0.8% 0.5% 1.6% 0.9% 1.0%
Northern Pike 1.3% 1.0% 1.3% 2.1% 0.6% 1.5%
White Crappie 0.3% 0.1% 0.2% 0.7% 0.3% 0.4%
Sample size 2614 1098 603 568 345 1516
Recaptures 389 129 97 109 54 260
Species 1999 ELECTROFISlDNG
Flannelmouth Sucker 42.9% 48.0% 49.4% 46.0%
Bluehead Sucker 22.3% 7.9% 31.8% 18.1%
Roundtail Chub 3.8% 4.6% 1.8% 3.8%
Colo. Pikeminnow 0.0% 0.5% 0.0% 0.2%
White sucker 9.4% 11.0% 8.8% 10.0%
White X Flanne1mouth 2.7% 7.0% 2.9% 4.4%
White X Bluehead 0.0% 0.5% 0.0% 0.2%
Channel Catfish 9.4% 7.4% 1.2% 7.2%
Carp 6.5% 4.6% 1.2% 4.8%
Small mouth Bass 1.3% 2.9% 2.4% 2.1%
Northern Pike elf'> 1.8%- 2.4% 0.6% 1.8%
White Crappie 0.0% 3.4% . 0.0% . 1.4%
Sample size 448 417 170 1035
Recaptures 52 49 12 113

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