8165

• UCREFRP Catalog Number: 8165
• Author: Czapla, T. E.
• Title: Genetics Management Plan ‎(Revised)‎.
• USFW Year: 1999.
• USFW - Doc Type: Denver, Colorado.
• Copyright Material: NO

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C. Humpback chub. The humpback chub was assigned "Priority 3" among the four endangered
species because the stocks are considered stable but small and localized in deep canyon river reaches.
Phenotypes of the humpback chub in the Yampa River and Desolation-Gray Canyons in the Green
River vary considerably and indicates possible hybridization with roundtail chubs at these two locations.
The Yampa River stock was assigned a Priority 2 designation among stocks within the species. Priority 3
within the species was assigned to the Cataract Canyon stock and Priority 4 was assigned to the Desolation-
Gray Canyon stock, primarily because of the remoteness of these stocks and low potential for catastrophic
risk.
1. Black Rocks Canvon Stock. Fifteen adult humpback chubs should be collected from two
locations: Black Rocks Canyon and Westwater Canyon. These fish will be maintained at Horsethief State
Wildlife Area, Colorado, as a safeguard against extinction from a catastrophe.
D. Colorado pikeminnow. The Colorado pikeminnow was assigned "Priority 4" among the four
endangered fishes because the stocks are considered to be stable. However, the Upper Colorado River
stock (upstream from Westwater Canyon) is low in number and was assigned Priority 1 among Colorado
pikeminnow stocks. The other stocks were assigned Priorities 2 or 3. The stock in the Gunnison River is
small and declining. A fishway has been constructed and operated at the Redlands Irrigation Diversion
Dam since in 1996 which provides access to Colorado pikeminnow from the Colorado River. Through
October 1998, the operation of the fish ladder has allowed 23 Colorado pikeminnow to pass.
1. Upper Colorado River Stock (downstream to Lake Powelll. The Colorado prkemmnow has
been extirpated from its historic habitat between the Price-Stub Irrigation Diversion Dam and Rifle,
Colorado. Restoration stocking of this reach has been proposed by the Colorado Division of Wildlife. -
Wild fish should be stream spawned in paired coatings during 1999. Details of the augmentation plan to stock
using the stream spawned progeny have yet to be worked out. The general concept is to raise the progeny
intensively in for a period of 1 to 3 years to attain a size where survival is greatly enhanced. The majority of
these fish will be used to establish themselves in the river above the Frice-Stubb Irrigation Diversion Dam. In
addition, translocation of adults to above the Price-Stubb Irrigation Diversion Dam will potentially allow the
determination of adult movements from this section of river prior to passage being constructed.
IX. LITERATURE CITED
Allendorf, F.W. and S.R. Phelps. 1981. Use of allelic frequencies to describe population structure.
Canadian Journal of Fisheries and Aquatic Sciences 38: 1502-1514.
Allendorf, F.W. and N. Ryman. 1987. Genetic management of hatchery stocks. Pages 141-159 in N.
Ryman and F. Utter, Editors. Population genetics and fisheries management. Washington Sea Grant
Program, University of Washington, Seattle.
Archer, D.L., L.R. Kaeding, B.D. Burdick, and C.W. McAda. 1985. Study of the endangered river fishes
of the Upper Colorado River. Draft fmal report. U.S. Department of the Interior, Fish and Wildlife
Service, Salt Lake City, Utah. 82 pp.
Archer, D.L., L.R. Kaeding, and H.M. Tyus. 1986. Colorado River fishes monitoring project. Final
report. U.S. Department of the Interior, Fish and Wildlife Service, Denver, Colorado. 64 pp.
Avise, J.C. 1989. Gene trees and organismal histories: a phylogenetic approach to population biology.
Evolution, 43: 1192-1208.
Barker, J.S.F. 1989, Population structure. Pages 75-80 ig~ W.G. Hill and F.C. Mackay, Editors. Evolution
and animal breeding. C.A.B. Intennational, Wallingford, United Kingdom.
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