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<br />50272 101 <br /> <br />- <br />REPORT DOCUMENTATION I" REPORT NO. 12. 3. Recipient's Accession No. <br />PAGE Biological Report 89(14) <br />4. Title and Subtitle 5. Report Date <br /> Habitat use and streamflow needs of rare and July 1989 <br /> endangered fishes, Yampa River, Colorado .. <br />7. Author(s) 8. Performing Organization Rept. No. <br /> Harold M. Tyus and Catherine A. Karp <br />9. Performing Organization Name and Address 10. Project/Task/Work Unit No. <br /> U.S. Fish and Wildlife Service <br /> Colorado River Fishes Project 11. Contract(C) or Grant(G) No. <br /> 1680 West Hwy 40, Suite 1210 (e) <br /> Vernal, UT 84078 <br /> (G) <br /> -- <br />12. Sponsoring Organization Name and Address 13. Type of Report & Period Covered <br /> Regional Director, Region 6 <br /> U.S. Fish and Wildlife Service <br /> P.O. Box 25486 Denver Federal Center ,.. <br /> Denver, CO 80225 <br />15. Supplementary Notes <br />IS. Abstract (limit: 200 words) <br /> In the Yampa River, stream habitat needs and life history requirements of <br /> Colorado squawfish (Ptychocheilus lucius) , humpback chub (Gila cypha), razorback <br /> sucker (Xvrauchen texanus) , and other native Colorado River fishes are presently <br /> maintained by flow regimens approximating natural conditions. Yampa River fl ows <br /> are also important in reducing adverse water management practices in the <br /> downstream Green River. Management for recovery of endangered fishes in the <br /> Yampa River will require specific flows to provide seasonal requirements at <br /> different locations: high spring flows associated with the initiation of Colorado <br /> squawfish spawning migrations, humpback chub and razorback sucker spawning, and <br /> maintenance of spawning bars and eddy habitats; descending summer flows <br /> associated with Colorado squawfish spawning, downstream transport of larvae, and <br /> creation of nursery habitat; stable winter flows to remove the threat of ice damage <br /> to shoreline areas used by many species. Acquisition of Yampa River water rights <br /> may be the decisive factor in conservation of endangered fish species in the <br /> Green River basin. <br /> - - <br />17. Document Analysis a. Descriptors <br /> Endangered species, rare and endangered fishes, Colorado River fishes, <br /> Colorado squawfish, humpback chub, razorback sucker, bony tail chub, <br /> streamflow habitat use <br />b. Identifiers/Open-Ended Terms <br /> Colorado River, Green River, Yampa River, habitat, stream, western States <br />c. COSATI Field/Group <br /> - _.~~_. I 21. No. of Pages <br />18. Availability Statement 19. Security Crass (This Report) <br /> UnclaSSifierl_______~-----27 . ----- <br /> Release Unlimited 20. Security Class (This Page) 22. Pnce <br /> Unclassified <br /> <br />(See ANSI-Z39.18) <br /> <br />See Instructions on Reverse <br /> <br />OPTIONAL FORM 272 (4-77) <br />(Formerly NTIS-35) <br />Department of Commerce <br /> <br />-6- U.S. Government Printing Office: 1989-673-208100017 <br />