i i sucker (Catostomus macrocheilus [Girard]), 3.5 percent northern squawfish (Ptychocheilus oregonensis [Richardson]). Trout were rare with brown trout being the most abundant at 0.7 percent of the total catch. Population estimates in the 90 km long Box Canyon Reservoir were made using the Schnabel multiple mark and recapture technique. The yellow perch population was estimated at 6,010,448 with 95 percent confidence limits ranging from 4,139,850 to an upper limit of 9,116,972. The pumpkinseed

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... population was estimated at 3,889,758 with a range of 1,969,498 to 9,152,371. The population estimate for tenth was 1,085,921 with a range of 497,368 to 2,961,603. The estimated population for largemouth bass was 590,906 with the 95 percent confidence limits at 399,193 to 1,390,366. The northern squawfish population was estimated at 248,988 with a range of 97,642 to 995,950. The estimated population for largescale suckers was 186,693 with the 95 percent confidence limits at 79,782 to 583,416. The longnose sucker estimate was 183,457 with a range of 62,542 to 917,286. The population estimate for mountain whitefish was 163,890 with a range of 70,038 to 512,156. Brown bullhead populations were estimated at 36,200 with a lower limit of 6,464 and an upper limit of 362,001. The brown trout population was estimated at 7,264 with a range of 3,104 to 22,701. Population estimates were made using the removal depletion method at four sites on each of the five tributaries. The highest densities of brown trout, brook trout and cutthroat trout from the four sites on Skookum Creek (+95% C-1.) were 80.9 + 6.5, 50.7 f 4.7, and 2.1 f 1.5 fish/l00 m*, respectively. The highest densities from Cee Cee Ah Creek (+ 95% Cl.) were 35.6 f 7.1 fish/l00 m*, for brown trout, 34.0 + 5.7 fish/l 00 m* for brook trout and 13.2 + 8.2 fish/l 00 m* for cutthroat trout. The highest densities of brook trout and cutthroat trout from Tacoma Creek (k 95% C.I.) were 26.3 f 1.1 and 4.5 f 2.6 fish/l00 m*. respectively. The highest densities from sites on LeClerc Creek (+ 95% C.I.) were 6.0 f 0.6 fish/l00 m* for brown trout, 10.2 flO.0 fish/l00 m2 for brook trout and 1 .l + 0.0 fish/l00 m* for cutthroat trout. Ruby Creek brook trout densities were 34.0 + 5.7 fish/100 m* and cutthroat trout densities were 20.5 fish/l 00 m*.