7086

• UCREFRP Catalog Number: 7086
• Author: U.S. Fish and Wildlife Service.
• Title: Indexed, Annotated Bibliography of the Endangered and Threatened Fishes of the Upper Colorado River System.
• USFW Year: 1977.
• USFW - Doc Type: Denver, Co.
• Copyright Material: YES

175. Holden, P. B., and C. B. Stalnaker. 1974.
Distribution of fishes in the Dolores and
Yampa river systems of upper Colorado
basin. Southwestern Naturalist 19(4):403-
412. (Abstr.)
Fish sampling was conducted in the Dolores
River, Colorado in 1971 and the Yampa River
system of Colorado, 1968-71 with emphasis
placed on rare and endangered species. Eleven
species were found in the Dolores River, but no
rare and endangered forms were collected due to
the small size of the river. Twenty-two species
were collected in the Yampa River system,
including four rare and endangered forms;
Colorado squawf ish (Ptychocheilus lucius),
humpback chub (Gila cypha), bonytail chub
(Gila elegans). The Yampa system appeared
rather important to reproduction and preservation
of Colorado squawf ish.
176. Holden, P. B., and C. B. Stalnaker. 1975.
Distribution and abundance of mainstream
fishes of the middle and upper Colorado
River basins, 1967-1973. Transactions
American Fisheries Society 104(2):217-
231.
Twenty-nine species of fishes were collected in
the upper Colorado River basins in 1967-1973.
The native suckers, Catostomus latipinnis and
C. discobolus, were the abundant species in the
study area. Introduced species outnumbered
native species 19 to 10. The introduced Ictalurus
punctatus and Notropis lutrensis were abundant
throughout most of the upper basin. The abundance
of introduced species has increased steadily
since 1900 as has the introduction of new
species. Four endemic species, Ptychocheilus
lucius, Gila elegans, Gila cypha, and Xyrauchen
texanus, are considered endangered. These rare
forms reproduce in the lower Yampa River,
Desolation Canyon of middle Green River, and
the lower Green River in Canyon Lands National
Park. The major reasons for the decline of
native fishes are considered to be alterations
of habitat by high dams and introduction of
exotic species.
SURVEY
DISTRIBUTION
ENDANG FISH
YAMPA R.
DOLORES R.
1, 2, 3, 4, 5
SURVEY
DISTRIBUTION
SPAWNING
ENDANG. FISH
POPULATION
HABITAT ALT.
COLORADO R.
GREEN R.
1, 2, 3, 4
35, 39
75