9436

• UCREFRP Catalog Number: 9436
• Author: McAda, C. W.
• Title: Subadult and Adult Colorado Pikeminnow Monitoring; Summary of Results, 1986-2000.
• USFW Year: 2002.
• USFW - Doc Type: Recovery Program Project Number 22,
• Copyright Material: NO

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White River
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Year
FIGURE 8. -Mean CPE (CPM/hr) of Colorado pikeminaow in the White River,
1986-2000. Vertical bars represent 95% confidence intervals; regression results are
provided in Table A-9.
Relationship Between Mean CPE and Population Estimates
Population estimates were available for 1992-1997 in the Green, Yampa, and White rivers
(Kesler 2000) and for three different time periods in the Colorado River - 1991-1997
(Kesler 2000}, 1992-1994 (Osmundson and Burnham 1998), and 1998-2000 (Osmundson
2002}. Linear regressions were calculated for each river by time period and in the Colorado
River for the combined period encompassed by the two Osmundson estimates. Mean CPE
and population estimates were poorly correlated, with the White River exhibiting the only
significant relationship at Ps0.05 (Table 3). However, the relationship in the Green River
was significant at Ps0.1 (Table 3).
Size Structure
Annual length-frequency distributions for the Green, Colorado, Yampa, and White rivers
are provided in Figures A-1-A-4. Annual length-frequency distributions for the upper and
lower reaches of the Green and Colorado rivers are provided in Figures A-5-A-6. Annual
histograms varied among rivers, but generally reflected the same patterns. For example,
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