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• UCREFRP Catalog Number: 7300
• Author: Tyus, H. M. and C. A. Karp.
• Title: Habitat Use and Streamflow Needs of Rare and Endangered Fishes, Yampa River, Colorado.
• USFW Year: 1989.
• USFW - Doc Type: Biological Report 89‎(14)‎,
• Copyright Material: NO

.+VL.L -I VI
REPORT DOCUMENTATION
1. REPORT NO.
2.
3. Recipient's Accession No.
PAGE Biological Report 89(14)
4. Title and Subtitle
Habitat use and streamflow needs of rare and 5. Report Date
July 1989

endangered fishes, Yampa River, Colorado 6.
7. Author(s) 8. Performing Organization Rept. No.
Harold M. Tyus and Catherine A, Karp
9. Performing Organization Name and Address 30. Project/Task/Work Unit No.
U.S. Fish and Wildlife Service
Colorado River Fishes Project 11. Contract(C) or Grant(G) No.
1680 West Hwy 40, Suite 1210 (~)
Vernal, UT 84078
(G)
12. Sponsoring Organization Name and Address 13. Type of Report & Period Covered
Regional Director, Region 6
U.S. Fish and Wildlife Service
P,O. Box 25486 Denver Federal Center ia.
Denver, CO 80225
15. Supplementary Notes
16. Abstract (Limit: 200 words)
In the Yampa River, stream habitat needs and life history requirements of
Colorado squawfish (Ptychocheilus lucius), humpback chub (Gila cypha), razorback
sucker (Xyrauchen texanus), and other native Colorado River fishes are presently
maintained by flow regimens approximating natural conditions. Yampa River flows
are also important in reducing adverse water management practices in the
downstream Green River. Management for recovery of endangered fishes in the
Yampa River will require specific flows to provide seasonal requirements at
different locations: high spring flows associated with the initiation of Colorado
squawfish spawning migrations, humpback chub and razorback sucker spawning, and
maintenance of spawning bars and eddy habitats; descending summer flows
associated with Colorado squawfish spawning, downstream transport of larvae, and
creation of nursery habitat; stable winter flows to remove the threat of ice damage
to shoreline areas used by many species. Acquisition of Yampa River water rights
may be the decisive factor in conservation of endangered fish species in the
Green River basin.
17. Document Analysis a. Descriptors
Endangered species, rare and endangered fishes, Colorado River fishes,
Colorado squawfish, humpback chub, razorback sucker, bonytail chub,
streamflow habitat use
b. Identifiers/Open-Ended Terms
Colorado River, Green River, Yampa River, habitat, stream, western States
c. COSATI Field/Group
18. Availability Statement 19. Security Class (This Report) 21. No. of Pages
Unclad if' 77 _
Release Unlimited 20. Security Class (This Page) 22. Price
Unclassified
(See ANSI-239.18) See Instructions on Reverse UPTIONAL FORM 272 (a-77)
(Formerly NTIS-35)
{r U.S. Government Printing Office: 1989-873-208100017 Department of Commerce