7153

• UCREFRP Catalog Number: 7153
• Author: Holden, P. B.
• Title: Study of the Habitat Use and Movement of the Rare Fishes in the Green River, Utah.
• USFW Year: 1978.
• USFW - Doc Type: Logan, Utah.
• Copyright Material: NO

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DISCUSSION

Fish Distribution and Abundance

All fish species previously reported from the study area were
caught during this study except for the northern pike (Esox lucius)
(Seethaler, McAda and Wydoski, 1976).

Rare fish distribution and relative abundance in the study
area has apparently changed little in recent years. Seethaler,
McAda and Wydoski (1976) found one juvenile squawfish and two sub-
adults in the upper portion of the study area (Jensen to Ouray).
The Colorado River Fishes Recovery Team sampled the same area in
1976 and caught 10 juveniles and 30 subadult and adult squawfish,
and one adult razorback sucker.
Vanicek, Kramer and Franklin (1970) sampled below Ouray in
1964-66 and found adul t and young-of-the-year squawfi sh and adul t
razorback suckers. Holden and Stalnaker (1975) collected in the
area from Ouray to Green River in 1967-73 and found all four rare
fish, including young-of-the-year squawfish and juvenile humpback
chubs. MeAda (personal communication, 1977) sampled Desolation
and Gray canyons in June of 1977. and found approximately 35 squaw-
fish, including juveniles and subadults. No recent change in popu-
lation status is evident, except that squawfish apparently spawned
only in the extreme lower portion of the study area in 1977. Thus,
the rare fishes appear to be maintaining populations in the study

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