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 Annual Incremental
Growth
~ 40
~ 35
3 30
~ 25
~ 20
w
~ 15~
e
~ ]0 -
~ 5~
~ 0-
- - _
~~~~~. ~.
01998-1999 ®1999-2000 ^All Years
~ Figure 4. Westwater Canyon humpback chub annual incremental growth for individuals between
1998-1999 and 1999-2000, and among all years (1992-2000). All years data includes
estimates of average annual growth for individuals that were recaptured after more than
one year at large. Standard error is not included for respective size classes and years that
annual incremental growth was determined from one individual.
Westwater Canyon Humpback Chub Historic ISMP CPUE

1.6 - -~_._.~..__.__. _...._~_.___ __..~_ ___~ __--° _----_
0 1.4 ~ _ _ -_ __ -_
° p =0,~
s
1.2 ~ - _ . -. _ _
e
~ 1 _. _
8 _ _ _ __
0.8 ~ __:_
~ 1 _
~ 0.6 ~ - _ _ _ _ _ -
_. _._ .. _... _ _. _. - T
W 0.4 - -- _ - ~- -
0 - ~ ~- --~---;----_
1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000
Year
Figure 5. Westwater Canyon humpback chub catch per unit effort for samples collected using
a ISMP protocol from 1988 to 2000. CPUE for each year includes respective standard
error. Line represents trend among all passes in all years. The p-value indicates statistical
significance of the trend line.
~ 21
180-200 201-220 221-240 241-260 261-280 281-300 301-320 321-340 341-360
Initial Size (mm)