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J* i , <br />EXECUTIVE SUMMARY. <br />The purpose of this research was to address the concerns that large numbers of larvae, sub-adult, <br />and adult razorback sucker and Colorado pikeminnow were becoming stranded in the raceway <br />and Green River Canal, an irrigation/power plant system located north of the town of Green <br />River, Utah (Figure 1) and fed by Tusher Wash Diversion Dam. The objectives of this study <br />were to: 1) determine the number of razorback sucker and Colorado pikeminnow in the raceway <br />and Green River Canal; 2) determine the locations where these native fish were found within the <br />canal; and 3) determine if they became stranded in the canal during dewatering. <br />Our data provided little information regarding larval fish entrainment in the Green River Canal. <br />No Colorado pikeminnow, razorback sucker, or Gila spp. larvae were captured during this study. <br />However, minimal effort was expended and only three larval fish (flannelmouth suckers) were <br />captured in the raceway. <br />During the irrigation season, one adult razorback sucker and six Colorado pikeminnow were <br />captured in the raceway and canal. The razorback sucker and one sub-adult Colorado <br />pikeminnow were in the raceway and five adult pikeminnow were captured in the first four miles <br />of the canal between the first and second siphons. No endangered fish were captured or <br />observed in the canal below the second siphon. <br />As the canal was drained in November 2000, no sub-adult and adult endangered fish were found <br />stranded. The sluice gates were opened one by one in an upstream sequence to allow a gradual <br />depletion of water. After the canal was completely drained red shiners, common carp, <br />flannelmouth suckers, fathead minnows, channel catfish, green sunfish, and bluehead suckers <br />were found in isolated pools.