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YOUNG-0F-YEAR COLORADO SQUAWFISH <br />Sampling Reaches <br />Four important nursery areas in the Colorado (Reach 1, RM 0-110; Reach 2, RM 135-170) and <br />Green (Reach 3, RM 0-110; Reach 4, RM 200-220) rivers are sampled during the YOY Colorado <br />squawfish portion of ISMP (Figure 1). These four reaches compose about 709'° of the known ' <br />distribution of YOY Colorado squawfish in the Green River and about 809 in the Colorado River. <br />Methods <br />Each reach sampled was divided into 5-mile subreaches which formed the basis for the sampling <br />design. A sampling crew began at the top of each reach and traveled downstream until it reached a <br />suitable backwater (surface area of at least 30 m2 and maximum depth of at least 30 cm, unless the <br />water was turbid) which it sampled with a 4.6-m-long, 3-mm-mesh seine. Two non-overlapping seine <br />Yampa River <br />Vernal ~ <br />4 <br />White River <br />Green <br />River <br />Grand <br />Colorado 2 ~°"`~1O" <br />River 40 <br />Green River 120 _ 170 <br />$ ~ Gunnison River <br />~ Moab <br />0 <br />Figure 1.-Reaches sampled during the YOY Colorado squawfish portion of the Interagency <br />Standardized Monitoring Program. <br />2 <br />