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RESULTS AND DISCUSSION Field collections were completed by November 30-, 1981 and the report deadline of January 31, 1982 left little time for data analysis. Problems in the development of statistical programs for the MANAGE program, and time required for entering data into the MANAGE system also caused delays. Some sections of the study are deficient in analysis or portions of data have not been retrieved from the MANAGE system. Therefore, it may be necessary to supplement parts of this report with a more y comprehensive data analysis at a later date. Every attempt has been made to identify areas of deficiencies in this text. 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. 3. Lower - Large river channels, divided into two subunits; canyon areas of steep gradient, rocky bottoms and meandering river sections with sandy/silt bottoms. Water in this zone is warm, turbid, high in nutrients. Primary production is low, benthic invertebrates dependent on substrate. Fish species composition variable but dominated by cyprinids, catostomids and influenced by introduced fish species. Following Joseph et al. (1977), the White River includes two zones. The upper two strata fall in the 2nd zone, and the lower three strata more properly belong in zone 3. Physicochemical Description of Strata Physicochemical parameters were measured in order to characterize strata. Water temperatures and conductivities increased during the year for all strata. Strata V & W were cooler than others, probably due to their higher elevation. Turbidities were highest during runoff with the y exception of peaks during summer thunderstorms. The general description of each stratum is provided as an aid in interpreting physicochemical data (Table 3). In addition, Figure b enumerates the occurrence of eight habitat types in the study area. 17.