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<br />33 <br /> <br />knowledge, the first young razorbacks reported from the upper Colorado <br />Basin. A more detailed taxonomic analysis of these specimens, including <br />comparison with known razorbacks from Willow Beach National Fish Hatchery, <br />will be carried out in the near future to verify the preliminary identi- <br />fication. <br /> <br />Preferred Habitat of Rare Fishes <br /> <br />The data from this study show that young-of-the-year and juvenile <br />squawfish prefer backwaters where there is little or no current and a <br />silt bottom. Juveniles prefer deeper areas than young-of-the-year. <br />Vanicek (1967) indicated that young squawfish (age groups 0-11) were <br />found in areas where "current was slight or lacking." Holden and <br />Stalnaker (1975) found young-of-the-year in shallow backwaters and ju- <br />veniles in backwaters and eddies 2 to 3 feet in depth. <br />The data indicate that subadu1t squawfish prefer runs and eddies <br />as opposed to backwaters. Vanicek (1967) found a similar pattern, <br />Holden and Stalnaker (1975) indicated that slow water was preferred to <br />runs and fast eddies, and backwaters were used during high water. A <br />collecting trip in May of 1976, conducted by the Colorado River Fishes <br />Recovery Team from Jensen to Ouray, produced approximately 30 subadu1t <br />and adult squawfish. All of these fish were taken in backwaters. These <br />data suggest that larger squawfish in the Green River may change habitat <br />preference with season. Durin] high water (spring and early summer) <br />backwaters appear to be preferred; whereas, during low water (fall) ed- <br />dies and runs are predominantly used. Kidd (1976) indicated that <br />