7407

• UCREFRP Catalog Number: 7407
• Author: McAda, C. W.
• Title: Results of the Interagency Standardized Monitoring Program, 1988.
• USFW Year: 1989.
• USFW - Doc Type: Grand Junction, Colorado.
• Copyright Material: NO

Table 4. Total number of introduced predators observed during Spring,
Late-Juvenile/Adult Colorado squawfish monitoring, 1988.
TOTAL NUMBER OBSERVED
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REACH ----------
NORTHERN ---------- ----------------------
LARGEMOUTH SMALLMOUTH GREEN
RIVER CODE PIKE WALLEYE BASS BASS SUNFISH
Green 1 4 0 0 0 '~ 0
2 8 2 0 0 0
3 9 1 0 ,~ _ 0 0
4 2 2 0 0 0
5 0 0 0 0 0
Colorado 6 0 0 0 0 0
7 0 0 0 0 0
8 0 0 0 0 0
Yampa 9 0 0 0 0 0
10 0 0 0 0 0
11 0 0 0 0 0
White 12 0 0 0 0 0
13 0 0 0 0 0
FALL, POST-LARVAL, AGE-0 COLORADO SQUAWFISH
Methods
Post-larval Colorado squawfish monitoring was conducted between 20 September and
10 October in four river reaches--two in the Green River and two in the Colorado
River (Table 5; Figure 2). Sampling was done with 1/8-inch-ace-mesh beach
seines, 15 ft long by 4 ft deep. Investigators divided each river reach to be
sampled into 5-mi sections. Sampling crews began at the upstream 5-mi section
and traveled downstream until they located the first suitable backwater (at least
30 m2 in size and at least 1 ft deep at its deepest point)--defined as a~primary
backwater. The backwater was then sampled with two non-overlapping seines hauls
which encompassed at least 25~ of the backwaters surface area. The crew then
traveled downstream until they located a second suitable backwater--the secondary
backwater--and sampled it in the same manner. If a secondary backwater was not
found before reaching the end of the 5-mi reach, no additional sampling was done.
This sampling procedure was then repeated in the next 5-mi reach.
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