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RESJJLTS AND DISCUSSION <br />General <br />Although field collections were completed in November, all data <br />analyses were not completed by the required report deadline. Problems <br />with entering data into the MANAGE system, development of a statistical <br />program for integration into MANAGE, and preparation of software have <br />delayed analysis of completed work. Transfer of the Vernal data-base <br />from the Fort Collins computer to the NOAA computer also caused delays. <br />Information presented is accurate; however, where needed analyses <br />have not been performed or where all data have not been received, it <br />may be necessary to supplement this report. In this text, every attempt <br />has been made to: <br />1. Define the nature of any deficiency; whether the data-base is <br />incomplete or analyses have yet to be performed. <br />2. Suggest possible changes in conclusions after pending studies <br />are completed. <br /> <br />Another problem concerned with interpretation of the results per- <br />tains to other field studies. Studies in progress on the Yampa River, <br />the Green River in Dinosaur National Monument, and the White River have a <br />bearing on the results of this study. These other studies will not be <br />reported until February 1982. Where suspected areas of support or <br />conflicts occur, these are stated. <br />Survey of the Habitat and Relationships of Fishes <br />General <br />Joseph et al. (1977) divided streams of the Upper Colorado River <br />Basin into three zones: <br />1. Upper or headwaters - "trout water" having cold temperatures, <br />clear water, and high gradients. Substrate is rocky, primary <br />productivity is significant, benthic invertebrates are substantial. <br />2. Intermediate - warmer water, less gradient, having greater flows <br />with increased levels of suspended and dissolved solids. Waters <br />clear except during runoff and rainy periods. Rocky to sandy <br />substrate; abundant benthic invertebrates in rocky areas to scarce <br />in sandy areas. Cyprinid and catostomid fishes predominate. <br />Primary production is high. <br />3. Lower - large river channels divided into two subunits; canyon <br />areas of steep gradient, rocky bottoms, and meandering river <br />sections with sand-silt bottoms. Water in this zone is warm, <br />20