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Table 4. Total number of introduced predators observed during Spring, <br />Late-Juvenile/Adult Colorado squawfish monitoring, 1990. <br />Total number observed <br />------------------------------------------------------ <br />Northern Largemouth Smallmouth Green <br />River Reach pike Walleye bass bass sunfish <br />Green 1 1 0 0 0 0 <br /> 2 3 0 0 0 0 <br /> 3 11 0 0 41 0 <br /> 4 0 0 0 0 2 <br /> 5 0 0 0 0 0 <br />Colorado 6 0 0 0 0 0 <br /> 7 0 0 0 0 1 <br /> 8 0 0 0 0 0 <br />Yampa 9 1 0~ 0 2 6 <br /> 10 8 0 1 3 0 <br /> 11 4 0 0 0 0 <br />White 12 0 0 0 0 0 <br /> 13 0 0 0 0 0 <br />FALL, POST-LARVAL, AGE-0 COLORADO SQUAWFISH <br />Methods <br />Post-larval Colorado squawfish monitoring was conducted between 20 <br />September and 10 October in four river reaches--two in the Green River and two <br />in the Colorado River (Table 5; Figure 2). Sampling was done with 1/8-inch- <br />ace-mesh beach seines, 15 ft long by 4 ft deep. Investigators divided each <br />river reach to be sampled into S-mi sections. Sampling crews began at the <br />upstream 5-mi section and traveled downstream until they located the first <br />suitable backwater (at least 30 m2 in size and at least 1 ft deep at its <br />deepest point)--defined as a primary backwater. The backwater was then <br />sampled with two non-overlapping seines hauls. The crew then traveled <br />downstream until they located a second suitable backwater--the secondary <br />backwater--and sampled it in the same manner. If a secondary backwater was <br />not found before reaching the end of the 5-mi reach, no additional sampling <br />was done. This sampling procedure was then repeated in the next 5-mi reach. <br />6 <br />