3102

• UCREFRP Catalog Number: 3102
• Author: Wick, E. J., J. A. Hawkins and C. A. Carlson.
• Title: Colorado Squawfish and Humpback Chub Population and Habitat Monitoring 1983-1984.
• USFW Year: 1985.
• USFW - Doc Type: Ft. Collins, CO.
• Copyright Material: NO

7
Design of the 1984 monitoring program
The time of sampling was based on temperature and flow
relationships. Sampling was conducted during three time periods
based on daily minimum water temperatures obtained from the USGS
Maybell gage operator:
1) runoff (pre-migratory) - 5 days after minimum water
temperatures were >120 Celsius (C) for a 3-day period,
2) spawning (migratory) - 5 days after minimum water
temperatures were >200C for a 3-day period, and
3) base flow (post-migratory) - 5 days after minimum water
temperatures were <120C for a 3-day period.
Fish sampling was conducted at four selected 3 mile segments.
Areas selected because of high habitat diversity, high incidence of
previous squawfish captures, and accessibility were:
1) Yampa Canyon (RMI 16-19),
2) Lilly Park - Little Snake (RMI 53.5-50.5),
3) Sunbeam (RMI 70.5-73.5),
4) Juniper Springs (RMI 90.5-93.5),
In addition to standardized monitoring sites, other areas were also
sampled at field crew discretion.
Fish Collections
1983
The Colorado River trend zone was divided into 5 mile sections
for systematic sampling using methodologies similar to those
employed 1981 and 1982 (Wick et al. 1985). Systematic sampling
included seining for larval and juvenile fish and boat
electroshocking for adult fishes. Sampling on the Yampa River was
primarily for adult fishes. Fish collections during fall special