8024

• UCREFRP Catalog Number: 8024
• Author: Prewitt, C. G., et al.
• Title: Colorado Squawfish and Humpback Chub Populations and Habitat Monitoring Program.
• USFW Year: 1978.
• USFW - Doc Type: Performance Report SE - 3 - 1,
• Copyright Material: NO

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JOB PROGRESS REPORT

State of

Colorado

Project No:

SE - 3 - 1

Endangered Wildlife Investigations

Work Plan No:

1

Job No:

1

Job Title: Colorado squawfish and humpback chub population
and habitat monitoring

Period Covered: Junel7. 1977 to September 30. 1978

. Personnel: David Langlois, John Torres, Charles Prewitt, Edmund
Wick, Clarence Carlson, "Darrel Snyder

ABSTRACT

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Fishes were collected and aquatic habitats described within five
endangered fishes trend zone areas. on the Colorado, Gunnison, White
and Yampa Rivers. Fish were sampled using seines, dip nets, and an
electrofishing boat from late July through mid-August, 1977. A total
of 18,772 fish were processed from 130 collections at 4l sites. No
threatened or endangered fishes were collected. Native species ac-
counted for most of the fish found in the White River. Introduced
cyprinids were predominant in the Gunnison and Colorado River collections.
Yampa River fishes were somewhat intermediate in relative abundance of
native and introduced species. Introduced cyprinids accounted for most
of the larval fishes collected, except in the White River trend zone.
Instream conditions were assessed using measurement and analysis proce-
dures developed by the Cooperative Instream Flow Service Group of the
U.S. Fish and Wildlife Service. Aquatic habitat was also described by
subjective observation and photographic documentation from late July,
1977 through March, 1978. Riparian habitat assessment included deter-
mination of bankside vegetation, bank stability, and regional land use
practices with emphasis on water diversion, return flows, and pollution.

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