7813

• UCREFRP Catalog Number: 7813
• Author: Vanicek, C. D., R. H. Kramer and D. R. Franklin
• Title: Distribution of Green River Fishes in Utah and Colorado Following Closure of Flaming Gorge Dam
• USFW Year: 1970
• USFW - Doc Type: The Southwestern Naturalist
• Copyright Material: YES

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TABLE 5

Reproductive success of indigeous fishes at seven Locations, Green River, 1964-1966;
expressed as preseru:e (X) or abseru:e (0) of young-of-the-year

Bridgeport- Island Split
Little Willow Echo
Speciet Hole Creek Lodore Park Park Mt, Ouray
Gila Tobusta 0 0 X. X X X X
PtycJwcheiLus Lucius 0 0 0 X X X X
Rhinichthys ascuLus 0 X. X. X X X X
Catastomus latipinnis 0 X. X. X X X X
Pantasteus discoboLus 0 X. X. X X X X
Xyrauchen texanus 0 0 0 0 0 0 0
i COllus bairdi 0 0 0 X 0 0 0
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. 1 . 1965 only.
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humpback sucker, was observed in 1964, 1965, and 1966 (Table 5).
Reproduction also occurred for the following exotic species: carp, fat-
head minnow, redside shiner, channel catfish and black bullhead.
Ouray (160 miles below dam).-The species composition in this
area was different from that found upstream in the Monument. Carp
were very abundant, while Colorado chub, speckled dace, Dannelmouth
sucker, and bluehead sucker, all very conunon in the Monument, were
relatively uncommon. This change in fish populations was probably
related to the reduced gradient of the river in this lower area. Young-
of-the-year specimens of all native fish species found at this station
were collected with the exception of humpback suckers (Table 5).
Young-of-the-year carp, fathead minnow, redside shiner, channel cat-
fish, and black bullhead were also collected.

FISH DISTRIBUTION-PRE-IMPQUNDMENT. Data on the pre-
impoundment status of Green River fishes within the study are limited
and were extracted from five sources:
1) McDonald and Dotson (1960): Investigations by the Utah State
Department of Fish and Game, conducted in July and August, 1959,
from the reservoir basin to 29 miles downstream from the damsite;
gear consisted of gill nets, seines, and prima cord ;
2) Dotson (unpublished data, Utah State Department of Fish and
Game): Fish collected with hook and line by Utah State Department
of Fish and Game personnel in August and September, 1960, and
August, 1961, in the Flaming Gorge Reservoir basin and inunediately
below the damsite;
3) Azevedo (Unpublished fishery management report, Bureau
Sport Fisheries and Wildlife): Collections from the Green River within

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