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slow water, compared to 49 and 14 percent, <br />respectively, for the unaltered sections. <br />Amount of cover per acre of stream was about 80 <br />percent greater in the unaltered mountain <br />section than in the altered. Rock deflectors <br />in the altered section of Wolf Creek Canyon <br />rendered the physical characters of the stream <br />nearly comparable to the unaltered sections. <br />Fish populations were estimated by means of a <br />simple mark-and-recapture census. Non-trout <br />species were absent from the altered sections, <br />but made up 30 and 58 percent of the total <br />number and weight respectively, in the unaltered <br />mountain sections. Trout were 78 percent more <br />abundant in the unaltered mountain sections <br />than in the altered, and a statistical test <br />indicated a significant difference between the <br />two trout populations. Standing crops of trout <br />ranges from 40 to 226 pounds per acre, and the <br />total stream supported an estimated 20,400 <br />trout greater than 4.0 inches long weighing <br />9,500 pounds. Channel alterations resulted in <br />a total loss of 4,700 trout with a total weight <br />of 2,200 pounds. <br />136. Everhart, W. H., and W. R. Seaman. 1971. <br />Fishes of Colorado. Colorado Division of <br />Wildlife, Denver. 75 pp. <br />This publication provides keys for identification <br />as well as descriptions and information on life <br />histories of fish found in Colorado. (Wydoski) <br />137. Everhart, W. H., and B. E. May. 1973. Biota <br />and chemistry of Piceance Creek. Effects <br />of chemical variations in aquatic environ- <br />ments, Volume I. U. S. Environmental <br />Protection Agency, Office of Research and <br />Monitoring, Washington, DC. EPA-R3-73- <br />Olla. (Abstr.) <br />'Sampling a small stream in the rich oil shale <br />country of northwestern Colorado confirmed <br />distinct seasonal trends and habitat preferences <br />in invertebrate populations. Discharge was a <br />major influence on invertebrates and chemical <br />compositor of the stream. Seasonal variations, <br />biomass, and species composition of invertebrates <br />appear characteristic of oil shale area streams. <br />~'~SH <br />KE'Y° <br />DESCRIPTION <br />LIFE HhSTORY <br />INVERTEBRATES <br />FLOW <br />WATER QUAL. <br />WHITE R. <br />E~1 <br />