9591

• UCREFRP Catalog Number: 9591
• Author: Nesler, T. P.
• Title: Interactions Between Endangered Fishes and Introduced Gamefishs in the Colorado River, Colorado, 1986-1991.
• USFW Year: 2002.
• USFW - Doc Type: 91-29,
• Copyright Material: NO

Table 2. Number offish caught/100m2 for gamefish species and Colorado pikeminnow collected by seine
in Colorado River backwaters from 1986-1991.

Seine Backwater
Year River No. of No. of Black Channel Green Large- CPM3
miles 1 seines BA2 area area bullhead catfish sunfish mouth
(m2) (m2) bass
1986 25.6 22 11 1,120 10,635 0.09 0.00 3.13 0.09 0.63
1987 50.9 41 19 1,2684 10,7224 0.00 0.00 2.374 0.81' 1.024
1988 54.1 45 20 2,4565 26,1915 4.19 0.77 4.48 0.98 0.04
1989 25.1 22 11 1,228 16,534 2.2 0.73 2.28 0.90 0.00
1990 33.9 28 14 1,376 25,794 0.21 1.82 4.94 0.21 0.07
1991 49 40 20 1,940 16,311 1.8 0.21 3.2 0.10 0.05

River Mde reach desIgnations. 1986. 169.0-143.4,1987: 182.4-131.5, 1988.182.2-128.1,1989.167.5-142.4,
1990: 169.4-135.5; 1991: 183.2-134.2

2BA=backwater
3CPM=Colorado pikeminnow

4area estimates/catch rates only for ISMP backwaters; samples sizes: LMB=ll; GSF=30, CPM=13

5area estimates for 10 ISMP backwaters only were seine area=1,156m2; BA habitat=15,604m2

Table 3. Correlations between annual catch rates for fish species seine-collected in the Colorado River,
1986-1991. Red=significant correlation (r~.811) at P=O.05, n=6, degrees offreedom=4.
Blue=ne ative correlation.
Species BBR' CCF GSF

0.10 0.22

0.73

ISpecies code: BBH=black bullhead, CCF=channel catfish, GSF=green sunfish, LMB=largemouth bass,
CPM=Colorado pikeminnow.
2Correlations derived from total number fish caught correlated to seine and backwater areas.

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