1103

• UCREFRP Catalog Number: 1103
• Author: Holden, P. B.
• Title: Study of The Habitat Use and Movement Of The Rare Fishes In The Green River From Jensen To Green River, Utah, August and September, 1977
• USFW Year: 1977.
• USFW - Doc Type: Final Report.
• Copyright Material: NO

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DISCUSSION

Fish Distribution and Abundance

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All fish species previously reported from the study are~ 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 stludy area has
apparently changed little in recent years. Seethaler, McAdal and Wydoski,
(1976) found one juvenile squawfish and two subadults in the! upper por-
tion of the study area (Jensen to Ouray). The Colorado Rivelr Fishes
Recovery Team sampled the same area in 1976 and caught 10 jUveniles and
30 subadult and adult squawfish, and one adult razorback su~ker.
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 raizorback
suckers. Holden and Stalnaker (1975) collected in the area from Ouray
to Green River in 1967-73 and found all four rare fish, incl!uding young-
of-the-year squawfish and juvenile humpback chubs. McAda (personal com-
munication, 1977) sampled Desolation and Gray canyons in June of 1977 and
found approximately 35 squawfish, including juveniles and subadults. No
recent change in population status is evident, except that squawfish
apparently spawned only in the extreme lower portion of the ~tudy area
in 1977. Thus, the rare fishes appear to be maintaining poplulations in
the study area.
Perhaps the most noteworthy specimens found during the present study
were the young-of-the-year razorback suckers. These represeht, to our

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