7055

• UCREFRP Catalog Number: 7055
• Author: Archer, D. L., L. R. Kaeding and B. D. Burdick.
• Title: A Study of the Endangered Fishes of the Upper Colorado River.
• USFW Year: 1985.
• USFW - Doc Type: Grand Junction, Colorado.
• Copyright Material: NO

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LIST OF TABLES

'Table Paqe

1. Data for Colorado squawfish implanted with radio transmitters
with a theoretical 18o-day battery life, Colorado River, spring
1982. 11

2. Data for Colorado squawfish implanted with radio transmitters,
Colorado River, fall 1982 and spring 1983 . 12

3. Data for Colorado squawfish implanted with radio transmitters
with a theoretical 18o-day battery life, Colorado River,
spring 1984 . 13

4. Date and location of initial capture and subsequent recaptures of
wild Colorado squawfish in the Colorado River, 1979-84 15

5. Peak and range of spawning dates for Colorado squawfish in major
reaches of the Colorado River, 1982-84, estimated on the basis of
size of collected larvae. 18

6. Mean-daily discharge, accumulated degree days above 12 and 20 C,
and the accumulated days that maximum water temperature equalled
or exceeded 18, 20, 22, and 24 C, as calculated for the estimated
beginning, peak, and end of the Colorado squawfish spawning
season in study reach 4 (westwater - Grand Valley), 1982 to 1984.
Discharge and temperature data were taken from the U.S.G.S. gage
near the Colorado-Utah border. ~19

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7. Number of samples taken from backwaters and total number of post-
larval, age-O Colorado squawfish collected from the Colorado River,
1982-1984. 22

8. Numbers of humpback chub, roundtail chub and unclassified Gila
'categorized in the field and by discrimnant analysis, that were
collected from the Black Rocks area of the Colorado River,
Colorado, 1983 and 1984. Percentage of the total in parenthesis. 36

9. Structure coefficients for nine morphometric measurements and
meristic counts taken from 582 live roundtail chub and humpback
chub collected from the Black Rocks area of the Colorado River,
Colorado, 1983 and 1984. . 38

10. Frequency of occurrence (') of roundtail chub and humpback chub
of mature size collected from the Black Rocks area of the
Colorado River, Colorado, 1983, that showed characteristics of
seasonal reproductive development. (Number of fish in
parenthesis.) 41

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