9654

• UCREFRP Catalog Number: 9654
• Author: U.S. Fish and Wildlife Service.
• Title: Results of the Interagency Standardized Monitoring Program, 1990.
• USFW Year: 1991.
• USFW - Doc Type: Grand Junction, CO.
• Copyright Material: NO

A
SPRING, LATE-JUVENILE/ADULT COLORADO SQUAWFISH MONITORING
Methods
Late-juvenile/adult Colorado squawfish monitoring was conducted in the
Green, Colorado, Yampa, and White rivers during April and May of 1990. Eight
river reaches were sampled by the Utah Division of Wildlife Resources (UDWR)
and 5 river reaches were sampled by the Colorado Division of Wildlife (CDOW:
Table 1, Figure 1). Each river reach was divided into at least 2 sub-reaches
to provide replicate samples--one shoreline of each sub-reach constituted one
sample. Sampling was done by electrofishing along both shorelines of all
reaches. Electrofishing crews began at the upstream end of each sub-reach and
moved downstream at a steady pace. Backwaters, tributary mouths, and other
habitat features were sampled once as the investigators proceeded downstream.
Sampling time was measured to the nearest second on an elapsed time clock
located on-the variable voltage pulsator and converted to the nearest 0.1 hr
for data analysis. All captured Colorado squawfish, humpback chub, and
razorback sucker were measured to total length and weighed before being
released at the original capture location. Numbers of Colorado squawfish that
were observed during the electrofishing collections but not captured were
noted. Total numbers of northern pike, walleye, largemouth bass, smallmouth
bass and green sunfish that were observed during sampling were also noted.
Complete details on sampling design and data collection are provided in the
ISMP Handbook.
Table 1. River reaches sampled in the late-juvenile/adult monitoring program
and codes used by ISMP.
River Boundary Reach General Area Agency
Green 335-327 1 Island Park UDWR
319-300 2 Split Mt.- Jensen UDWR
260-245 3 Ouray UDWR
I15- 96 4 Green River town to
Ruby Ranch UDWR
56- 40 5 Mineral Bottom UDWR
Colorado 154-132 6 Loma to State Line CDOW
99- 86 7 Near Dolores River UDWR
68- 49 8 Near Moab UDWR
Yampa 105- 95 9 Above Juniper CDOW
80- 70 10 Maybell CDOW
54- 49 11 Below Cross Mtn to
Lily Park CDOW
White 104- 95 12 Below Kenney Reservoir CDOW
21- 0 13 Mtn. Fuel-Bridge to
mouth UDWR
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