9725

• UCREFRP Catalog Number: 9725
• Author: Paukert, C.P., L.G. Coggins and C.E. Flaccus.
• Title: Distribution and movement of humpback chub in the Colorado River, Grand Canyon, based on recaptures.
• USFW Year: 2006.
• USFW - Doc Type: Transactions of the American Fisheries Society
• Copyright Material: YES

NOTE
Colorado River
100
?¦¦ Small N=6 14-90 days
80 Medium N=32
atye N-46
60
40
20-

0

100
Smarr N=2 91-365 days
$0 Medium N=33
Large N=101
Q? 60-

m
2
N
IL
40
20 -
-,
1
_
--
100
Small N-4 >365 days
Medium N=26
8 Large W-105
60
40
20
I
L
0 -
0 2 4 6 8 10 12 14
Little Colorado River
Small N=1,659 91-365 days
Medium N=1,754
Large N=1,342
40 01 UL -
Small N=254 >365 days
Medium N=905
Large N=2,075
0 2 4 6 8 10 12 14
Displacement (rkm)
543
FTGLmF 3.-Displacement between capture and recapture for three sizes of fish that exhibited restricted distribution in the
Colorado River and its tributaries, Arizona, at three different temporal scales: 14-90 d, 91-365 d, and more than 365 d. Sizes of
fish were based on the mean lengths of the fish between the capture and recapture periods and were classified as small (<200
mm), medium (200-299 mm), and large (>300 mm).
in Grand Canyon may be most logistically feasible on
a smaller scale that focuses on the LCR and its
confluence with the Colorado River. Researchers need
to choose the optimum sampling methodology to
accomplish their goals given reduced numbers of
endangered species, limited funds, and logistical
constraints (Tate et al. 2003). Although main-stem
Colorado River monitoring of humpback chub may be
needed to meet specific objectives (e.g., influence of
increased main-stem water temperature in the Colorado
River, Petersen and Paukert 2005), the trends in the
overall abundance of humpback chub in Grand Canyon
may be accomplished by focusing efforts in the LCR.
Acknowledgments
A special thanks to all the people who collected
humpback chub in Grand Canyon, including Arizona
Game and Fish Department, SWCA Environmental
SMal N=1,791 14-90 days
Medium N=1,697