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Ptychocheilus oregonensis [Richardson] PeamouthMylocheilus caurinus [Richardson] Lake chub Couesius plumbeus [Agassiz] Longnose sucker Catostomus catostomus [Forster] Largescale sucker Catostomus macrocheilus [Girard] Brown bullhead Ictaiurus nebulosus [Lesueur] Sculpin Cottus spp.In 1988, the catch was composed of 42 percent yellow perch, 19 percent pumpkinseed, 10 percent tenth, 7 percent largemouth bass, 5 percent northern squawfish, 5 percent largescale sucker, and 4 percent mountain whitefish. In 1989, yellow perch composed 45 percent of the catch, followed by pumpkinseed (17%) largemouth bass (9%), tenth (8%), mountain whitefish (6%), largescale sucker (5%), and northern squawfish (4%). Trout were rare during both 1988 and 1989, with brown trout being the most abundant at 0.6 and 0.7 percent of the total catch, respectively.Population estimates in the 90 km long 'Box Canyon Reservoir were made using the Schnabel multiple mark and recapture technique.