7969

• UCREFRP Catalog Number: 7969
• Author: Karp, C. A. and H. M. Tyus
• Title: Humback Chub ‎(
• USFW Year: 1990
• Copyright Material: YES

1990] HUMPBACK CHUB IN DINOSAUR NATIONAL MONUMENT 261
TABLE 1. Total catch (N) and catch per unit of effort of fishes collected by standardized angling (AN) and electrofish-
ing (EL), 1987-1989, Yampa, Lodore, Whirlpool, and Split Mountain canyons, Dinosaur National Monument. Total
effort in hours spent angling (angler hours) and electrofishing.

pecies

N
Yampa
Canyon
AN EL
Lodore
Canyon
EL
Whirlpool
Canyon
AN EL Split
Mountain
Canyon
EL
r
Native species
Flannelmouth sucker 2,159 0.30 28.94 24.72 0.00 27.82 20.92
Bluehead sucker 1,812 0.01 22.35 14.43 0.00 31.96 83.67
Roundtail chub 1,238 3.25 17.09 0.28 1.02 2.66 0.00
Humpback chub 109 0.65 1.03 0.00 0.23 0.00 0.00
Colorado squawfish 27 0.01 0.30 0.28 0.00 0.53 1.02
Razorback sucker 4 0.00 0.07 0.00 0.00 0.00 0.00
Mountain whitefish 2 0.00 0.02 0.00 0.00 0.13 0.00
In troduced species
Common carp 1,100 0.24 15.06 10.94 0.23 9.19 25.51
Channel catfish 1,091 4.01 9.64 1.79 2.61 8.26 71.94
Trouts 277 0.01 0.16 22.26 0.00 3.86 1.02
Black bullhead 31 0.11 0.21 0.09 0.68 0.4 0.51
Northern pike 15 0.00 0.18 0.00 0.00 0.13 2.04
White sucker 13 0.00 0.14 0.18 0.00 1.73 0.00
Smallmouth bass 6 0.00 0.11 0.00 0.00 0.00 0.00
Green sunfish 1 0.00 0.02 0.00 0.00 0.00 0.00
Total fish 7,885 653 5,349 795 42 641 405
Total effortb 76 56 11 9 8 2
'Includes rainbow, cutthroat, brown, an d lake trouts.
bRounded
TABLE 2. Total catch (N) and catch per unit of effort of
fishes collected by standardized electrofishing (EL),
1987-1989, Island and Echo parks, Dinosaur National
Monument. Total effort in hours spent electrofishing.
Island Echo
Park Park
Species N EL EL
Native species
Flannelmouth sucker 185 26.37
Bluehead sucker 145 21.54
Roundtail chub 42 3.22
Mountain whitefish 1 0.32
Introduced species
Common carp 125 19.29
Channel catfish 55 11.9
Trouts 16 0.64
Black bullhead 2 0.00
Northern pike 1 0.00
' White sucker 1 0.32
Green sunfish 2 0.32
Total fish 575 261
Total effortb 3
26.34
19.95
8.18
0.00
16.62
4.6
3.58
0.51
0.26
0.00
0.26
314
4
aIncludes rainbow, cutthroat, brown, and lake trouts.
bRounded
TABLE 3. Capture dates of humpback and roundtail
chubs in reproductive condition, Yampa and Green riv-
ers, Dinosaur National Monument, 1986-1989.
Tuberculate
Ripe males Ripe females fishb
Humpback chub
1986a Ju15-15 Ju15 -
1987 May 20-Jun 29 May 18-Jun 16 May 18-Jun 22
1988 Jun 7-28 Jun 15 Jun 6-15
1989 Jun 7 - May 27-Jun 6
Roundtail chub
1986a Ju16-29 - -
1987 May 18-Jun 20 May 17-Jun 23 May 17-Jun 29
1988 Jun 7-Ju15 Jun 16 Jun 7-29
1989 May 27-Jun 7 Jun 20 May 22-Jun 20
aNo sampling prior to July 5 in 1986.
bTuberculate fish were not ripe but exhibited secondary sex characters.
breeding condition (two of each sex) were col-
lected in July of that year. Ripe fish were
captured at water temperatures of about 19.5
C (range 14.5-23 C).
Roundtail chub in reproductive condition
(n = 242: 117 males, 6 females, and 119 tuber-
culate but nonripe fish) were darker than