9378

• UCREFRP Catalog Number: 9378
• Author: Nesler, T. P.
• Title: Recovery of the Colorado River Endangered Fishes
• USFW Year: 2000.
• USFW - Doc Type: Biological recovery goals and criteria for Colorado pikeminnow, Humpback chub, Razorback sucker & Bonytail.
• Copyright Material: NO

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Table of Contents I
Executive summary iv
Introduction 1 I.
Approach 1
Population estimation 4
Length frequency distribution and annual recruitment 5 I
Other Criteria 6
Species Status and Trends 7
Colorado pikeminnow: Status and Trends 7 I
Recovery Goals and Criteria 10
Humpback chub: Status and Trends 24
Recovery Goals and Criteria 26 I
Razorback sucker: Status and Trends 33
Recovery Goals and Criteria 33
Bonvtail Status and Trends 38 I
Recovery Goals and Criteria 38
Literature cited 42
Appendix Tables: A-1 through A-7 48
List of Fiaures I
1. Estimated population size for Colorado pikeminnow in the
Colorado-Gunnison Rivers from 1991-1997 15
2. Estimated population size for Colorado pikeminnow in the I
Green-Duchesne-Price Rivers from 1991-1997 15
3. Estimated population size for Colorado pikeminnow in the
White Rivers from 1991-1997 16 I
4. Estimated population size for Colorado pikeminnow in the
Yampa-Little Snake Rivers from 1991-1997 16
5. Length frequency distributions for Colorado pikeminnow I
in the Colorado-Gunnison Rivers, 1991-1997 17
6. Length frequency distributions for Colorado pikeminnow
in the Green River, 1991-1997 18 I
7. Length frequency distributions for Colorado pikeminnow
in the White River, 1991-1997 19
8. Length frequency distributions for Colorado pikeminnow
in the Yampa River, 1991-1997 20 I
9. Comparison of estimated numbers of Colorado pikeminnow
per mile in Upper Basin rivers 21
10. Length frequency distributions for humpback chub in Black I
Rocks, 1991-1997 29
11. Length frequency distributions for humpback chub in Westwater
Canyon, 1991-1997 30 I
List of Tables
1. Colorado pikeminnow recovery goals and criteria: down listing 22
2. Colorado pikeminnow recovery goals and criteria: delisting 23 I
3. Humpback chub recovery goals and criteria: downlisting 31
4. Humpback chub recovery goals and criteria: delisting 32
5. Razorback sucker recovery goals and criteria: down listing 36 I
6. Razorback sucker recovery goals and criteria: delisting 37
7. Bony tail recovery goals and criteria: downlisting 40
8. Bony tail recovery goals and criteria: delisting 41
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