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`J <br />determined. All fish caught were identified, enumerated, measured and <br />returned alive; those over 200 mm were marked with individually numbered <br />spaghetti tags. <br />Benthic mecroinvertebrates were sampled with a modified Hese sampler at <br />three sites each sample period: (1) An upper station approximately 100 <br />meters be lox an old, private, wooden bridge, (2) a middle station at the <br />Rio Blanco County highway bridge, and (3) s lower station at the takeout <br />point approximately 100 meters below the Rangely USGS gauging station <br />(Figure 1). Three replicates were taken at each site in cobbled riffle <br />areas of similar depth. The samples were preserved in 70 percent ETON <br />• and transferred to BTO/WEST's invertebrate laboratorq in Logan, Utah for <br />analysis. The samples were sorted and identified to the lowest <br />practical taxonomic level. Samples containing a large number of <br />organisms xere subsampled using a rotary subsampler. <br />Plankton were sampled in July and September at the same three sites <br />listed for macroinvertebrates. Txenty-five or 50 liters of water xere <br />filtered through an 80 u mesh plankton net and the contents preserved in <br />3 percent formalin. Three replicates were taken at each station. The <br />samples were analyzed for species present and relative abundance of both <br />zoo and phytoplankton. <br />Periphyton was sampled at each of the three stations in July and <br />• September by scraping rocks from one square foot of substrate and <br />preserving the contents on a 90 percent acetone solution. Three <br />II . G-5 <br />