8177

• UCREFRP Catalog Number: 8177
• Author: Valdez, R. A., B. R. Cowdell and L. Lentsch.
• Title: Overwinter Survival of Age-0 Colorado Pikeminnow in the Green River, Utah, 1987-1995\
• USFW Year: 1999.
• Copyright Material: NO

LIST OF TABLES

1.

Sample dates, main channel and backwater temperature ranges, and flow ranges for
the lower Green River (Reach 3) and the upper Green River (Reach 4), 1987-96 ...... 7

'")

Number of age-O Colorado pikeminnow, geometric mean CPUE, and mean total
length for the 1987-95 year classes in the lower Grt:en River (Reach 3; RK 0-193Y.
Asterisks denote significant differences (Students 't', P<O.05) in mean CPUEs
between fall and spring of a given year class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

-.
.).

Variables tested to evaluate overwinter survival of age-O Colorado pikeminnow ..... 11

4.

Number of age-O Colorado pikeminnow, geometric mean CPUE, and mean total
length for the 1989-93 year classes in the upper Grecn River (Reach 4, RK 346-515).
Asterisks denote significant differences (Students 't', P<O.05) in mean CPUEs
between fall and spring of a given year class . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

5.

Geometric mean CPUE for different backwater mean depths during fall and spring,
1987-92, in the lower Green River (Reach 3, RK 0-193). Asterisks denote significant
differences (Students '1', P<0.05) among mean CPUEs ......................... 15

6.

Total number and geometric mean CPUE's for native fishes captured in the lower
Green River (Reach 3, RK 0-193),1987-95 year classes ........................16

LIST OF FIGURES .

1.

The Green River in Utah and Colorado with study reaches 3 and 4 sampled for
overwinter survival of age-O Colorado pikeminnow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

'")

Flow and temperature of the Green River at Green River, Utah (U.S. Geological
Survey stream gage 09315000; Reach 3). Vertical parallel lines represent sampling

periods ................................................................ 9

-.
.) .

Flow and temperature of the Green River at Jensen, Utah (U.S. Geological Survey
stream gage 09261000; Reach 4 ). Vertical parallel lines represent sampling periods

............ .... ... . '" . . .... .., . . . ........ . . . . ..... ...... . ..........10

4

Relationships of overwinter survival of age-O Colorado pikeminnow in Reach 3 to
total length in fall, flow slope, temperature slope, and density of non-native fishes . . . . 12

5

Relationship of fall CPUE and spring CPUE of Colorado pikeminnow in Reach 3 .... 13

II