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

Table 2: Species composition for fish> IS cm at the Duffy station in 1998 and 1999.
Column 3 is for the study area with habitat composition data.

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I.TOTAL 2. ABOVE 3. SURVEY 4. STUDY 5. BEND
Columns STUDY STUDY TO TO .
2,3,4&5 AREA AREA BEND TAKE OUT
Species 1998 ELECTROFISlDNG
Flannelmouth Sucker 5.3% 2.7% 7.5% 6.1%
Bluehead Sucker 4.4% 4.4% 4.1% 4.6%
Roundtail Chub 3.3% 2.1% 6.6% 2.7%
Colo. Pikeminnow 1.5% 1.7% 0.0% 2.0%
White sucker 34.9% 49.1% 34.6% 25.7%
White X Flannelmouth 28.1% 22.6% 27.4% 31.9%
White X Bluehead 6.0% 4.0% 12.9% 4.6%
. Channel Catfish 3.0% 0.9% 0.9% 5.1%
Carp 2.7% . 0.9% 0.0% 4.8%
Smallmouth Bass 8.2% 7.4% 4.1% 10.3%
Northern Pike 2.8% 4.0% 1.9% 2.3%
White Crappie 0.1% 0.2%
White S. + Crosses 68.9% 75.7% 74.8% 62.2%
Sample size 1654 527 318 809
Recaptures 270 87 71" 112
Species 1999 ELECTROFISlDNG
Flannelmouth Sucker 5.1% 5.6% 2.4% 2.7% 7.6%
Bluehead Sucker 5.6% 3.3% 4.3% 4.8% 8.2%
.
Roundtail Chub 2.9% 3.5% 2.4% 3.3% 2.7%
Colo. Pikeminnow 0.6% 0.0% 1.0% 0.3% 0.9%
White sucker 33.4% 33.7% 40.9% 37.5% 26.3%
White X Flannelmouth 32.8% 41.6% 30.1% 28.5% 30.9%
White X Bluehead 5.9% 2.5% 5.7% 13.5% 4.8%
Channel Catfish 4.0% 1.0% 4.1% 3.0% . 6.1%
. Carp 1.1% 0.2% 0.2% 0.6% 2.6%
Smallmouth Bass 6.3% 7.5% 6.3% 3.9% 6.5%
Northern Pike 2.3% 0.8% 2.8% 1.8% 3.1%
White Crappie 0.1% 0.2% 0.0% 0.0% 0.1%
White S. + Crosses 72.0% 77.8% 76.6% 79.6% 62.1%
Sample size 2092 483 509 333 767
Recaptures 440 130 107 61 142

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seCtion below the study area, and 32% above the study area (Table 3). The weighted mean for

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all sites combined was 43% (Table 3). The next most common fish was bluehead sucker. The

study area had the highest percent of blue head sucker, almost as common as flannelmouth,

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