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10 <br />pools and slack-water areas and remained in the water overnight. Lar- <br />gest mesh was generally in swiftest water. <br />Two electro-fishing units were used. One was a 115 volt alternating <br />current generator with a 50 to 700 volt variable-voltage regulator, and <br />selector for direct current. This unit was mounted on a back-pack frame <br />and was carried into Gunnison Point section. It was used at the East <br />Portal section also. The second and larger unit consisted of a MITE-E- <br />LITE generator, a Coffelt Model II variable-voltage regulator and 300 <br />feet of electrical cord on a spool. It was used only at the East Portal <br />section. <br />Set-lines and rod and reel were used to sample the swift water areas. <br />Seines were ineffective under existing water conditions. <br />Data analyzed from the fish samples were: 1) age, 2) condition <br />factor, and 3) species identification. <br />Scales , for age determination, were taken from a diagonal scale <br />row below the dorsal fin, above the lateral line on the left side of the <br />fish. The scales were then cleaned in a one percent solution of potas- <br />sium hydroxide and were dry mounted between microscopic slides. Age <br />was determined by examining an image projected on a ground-glass screen <br />by a Bioscope Projector. If agreements were not reached for two of <br />three successive readings, the scale was discarded. <br />0 <br />Fork length (length from tip of snout to fork of tail) was used as <br />the standard measure and was recorded to the nearest one-eighth of an <br />inch. -Weight of each fish was determined on an Ohaus spring scale and <br />was recorded to the nearest ounce. Some standard and total length mea- <br />surements were taken for conversion purposes. <br />A coefficient of condition using C (English system) was calculated <br />as described by Lagler (1956). The formula used is expressed as C = W <br />L-