9531

• UCREFRP Catalog Number: 9531
• Author: Hudson, J. M. and J. A. Jackson.
• Title: Populaiton Estimates for Humpback Chub ‎(Gila cypha)‎ and Roundtail Chub ‎(gila robusta)‎ in Westwater Canyon, Colorado River, Utah, 1998-2000.
• USFW Year: 2003.
• USFW - Doc Type: Salt Lake City.
• Copyright Material: NO

Westwater Canyon Humpback Chub Adult Population
Estimate 1998-2000
16000 -r- - - -
14000 -
12000
10000 ~ -
z sooo
6000
4000
2000
0 . ____ __
1999
Year
1998
2000
~ Figure 1. Westwater Canyon adult humpback chub population estimates (N) for 1998-2000. Each
point estimate includes respective profile likelihood confidence intervals. Line represents
short-term trend among the three point estimates. The p-value indicates statistical
significance of the trend line.

Westwater Canyon Humpback Chub CPUE 1998-2000
M

0.6 -p-----------~ _ -
i
0.5 ~- .w __ _ _ _ _ _ ----- - -- _. _ __, 1
~ Ij ~ p = O.t)S
0.4 _ . __ - -_ _ _ __ _ ._ _ _
,~, 0.3 - _ _ - _ _ _ - -- _. 1
a 0.1 .. _ ~ _ _ _ --- -- - ~-- ~ i
U
0 -i--- .
1998A 1998B 1998C 1999A 1999B 1999C 2000A 2000B 2000C
Year

C
Figure 2. Westwater Canyon humpback chub trammel net catch per unit effort bypass for 1998-
2000. CPUE for each pass includes respective standard error. Line represents trend
among all passes in all years. The p-value indicates statistical significance of the trend
Line.
~ 19