7360

• UCREFRP Catalog Number: 7360
• Author: Tyus, H. M. and G. B. Haines
• Title: Distribution, Habitat Use, and Growth of Young Colorado Squawfish in the Green River Basin, Colorado and Utah
• USFW Year: 1989
• USFW - Doc Type: Transactions of the American Fisheries Society
• Copyright Material: YES

82 TYUS AND HAINES
TABLE I.-Catch (CPUE, fish/lOO m2) of age-O Colorado squawfish and effort (E, 100s of m2 seined), upper 150 I
Green River basin, 1979-1988. A-G = sampling strata. 1
Green River strata Yampa
Year, catch I
and effort A B C D E F G River 1201
July-August
1981
CPUE 12.3 27.4 2.0 1.9 2.9 14.1 0.0 1.7 90-
E 1.9 0.8 1.0 1.6 0.7 1.3 1.1 5.8
1984
CPUE 2.4 0.0 4.6 2.7 7.2 1.9 60-
E 2.1 0.7 1.7 2.2 4.7 1.1
1985
CPUE 33.2 5.8 0.0 3.6 16.6 66.5 62.9 0.0
E 2.4 0.9 I.I 1.4 1.2 1.6 0.6 0.6 30-
1986 N
CPUE 118.6 23.7 6.4 12.5 3.3 0.0 E
E 1.9 4.1 0.3 0.5 0.3 0.2 0 0
0
1987 ~
"-
CPUE 80.9 12.2 I.I 10.8 1.1 9.1 :r:
E 20.0 5.3 9.8 45.6 0.9 1.1 0
~
1988 <i
CPUE 47.6 55.9 6.1 15.9 2.1 0.0 0
E 1.9 1.0 0.2 1.5 1.0 2.3 50,
September-October
1979 40.
CPUE 33.0 19.8 6.1 21.5 10.9 24.8 0.0
E 13.9 12.2 9.7 11.0 14.6 17.9 6.4
1980
CPUE 75.3 42.2 24.3 9.3 11.0 13.3 3.5 0.1 30,
E 12.1 1.9 I.I 5.4 14.2 20.2 9.2 9.9
1981
CPUE 13.0 2.2 22.7 1.8 0.0 22.7 0.2 0.0
8.9 15.9 5.6 20'
E 8.3 3.7 5.6 2.6 11.4
1982
CPUE 9.1 1.1 0.0 3.8 9.7 27.3 0.0
E 15.6 7.5 2.0 4.8 8.4 14.3 7.5 '10
1983
CPUE 4.1 0.5 0.0 0.5 0.2 <0.1
E 11.5 6.0 2.1 6.2 15.6 25.5
1984
CPUE 0.0 1.3 0.0 0.7 2.4 0.3 0.0
E 2.0 1.6 1.6 4.\ 6.8 19.6 3.5
1985
CPUE 9.2 2.1 0.0 1.4 4.6 1.5 0.0 FIGURE 2.-Average catch
E 14.9 7.5 2.5 7.1 7.5 16.2 4.3 July-August 1981 and 1984-
1987 is measured from the Colora
CPUE 12.7 0.0 1.0 0.3 1.6 2.0 0.0
E 11.3 4.0 2.0 3.3 5.6 21.3 1.6
1988
CPUE 45.3 24.7 7.2 4.4 16.8 2.7 0.0 TABLE 2.-Hatching dates
E 23.1 11.4 6.8 12.4 13.7 22.2 4.6 calculated from total lengths
(I 988); N = number of fish.
(range, 20-74 d) after maximum flows, and larvae stream (Figure 2). One concenlration occurred be- Yaml
in the lower Green River hatched about 40.0 d tween RK 335 and 450, or about 150 km down- Year Mean
(range, 8-55 d) after maximum flows. Hatching stream ofYampa Canyon spawning area; another 1981 J un 29
occurred at mean water temperatures of about was about 150 km downstream of Gray Canyon 1982 Jul 14
22.9DC (range, 19-26DC) in the Green River for (between RK 32 and 160). However, as in the July 1983 Jul28
1984 Jul30
the years 1981 and 1984-1988. and August catches, highest numbers occurred ei- 1985 Jul 5
Postlarvae captured from late September to Oc- ther in the upper or lower Green River, depending 1986 Ju\ 20
lober were also concentrated in two areas, but fish on the year sampled. Higher catches generally oc- 1987 J un 28
abundance was reduced and the location of each curred in low-gradient reaches, induding strata A, 1988 Jul8
concentration area was shifted about 20 km down- B, E, and F (mean, 12.4/ I 00 m2 seined). Higher- a Range = dates that included S