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/ r'`-. RESULTS AND DISCUSSION General Although field collections were completed in November, all data analyses were not completed by the required report deadline. In addition, information from larval sampling for Colorado squawfish has not been received from the contractor. Problems with entering data into the MANAGE system, development of a statistical program for integration into MANAGE and preparation of software have delayed analysis of completed work. Transfer of the Vernal database from the Fort Collins computer to the NOAA computer also caused delays. Information presented is accutate; however, where needed analyses have not been performed or where all data have not been received, it may be necessary to supplement this report. In this text, every attempt has been made to: 1. Define the nature of any deficiency; whether the database is incomplete or analyses have yet to be performed. 2. Suggest possible changes in conclusions after pending studies are completed, and 3. Identify the time frame needed in order to provide additional material. Another problem concerned with interpretation of the results pertains to other field studies. Studies in progress on the Yampa River, the Green River in Dinosaur National Monument, and the White River have a bearing on the results of this study. These other studies will not be reported until February 1982. Where suspected areas of support or conflicts occur these are stated. Survey of the Habitat and Relationships of Fishes General Joseph et al (1977) divided streams of the Upper Colorado River Basin into three zones: 1. Upper or headwaters - "trout water" having cold temperatures, clear water and high gradients. Substrate is rocky, primary productivity is significant, benthic invertebrates are sub- stantial. 2. Intermediate - warmer water, less gradient, having greater flows with increased Levels of suspended and dissolved solids. Waters clear except during runoff and rainy periods. Rocky to sandy substrate; abundant benthic invertebrates in rocky areas to scarce in sandy areas. Cyprinid and catostomid fishes predominate. Primary production is high.