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

Yampa River. -Although the slope of the regression line through the annual CPE values
is signif cantly greater than zero, increase in mean CPE for the Yampa River is less than any
other river. Mean CPE was about 1 CPM/hr in 1986, but dropped below 0.5 CPM/hr in 1987
and remained below that level through 1990 (Figure 7). Mean CPE increased in 1991, but
remained below 1 CPM/hr until 1998. It dropped back below 1 CPM/hr in 2000.
White River. -Mean CPE in the White River increased more than in any other river in
the basin. Mean CPE was 0.27 CPM/hr in 19$6 and increased to 4.7 CPM/hr in 2000 (Figure
8). Mean CPE increased steadily throughout the study period except for 1991-1992 and
1998-1999 when it leveled off briefly.
4~
4
v 3
w
v 2
c
m 1
0
Yampa River

86 87 88 89 90 91 92 93 94 95 96 97 98 99 00
Year
FIGURE 7. -Mean CPE (CPM/hr) of Colorado pikeminnow in the Yampa River,
1986-2000. Vertical bars represent 95% confidence intervals; regression results are
provided in Table A-9.
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