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0.2 Stoneflies AERIAL APPLICATION amount of DDT analysis aquatic insects Average length Big Hole River Black flies bottom organisms bottom sampling brown trout Canyon Camp cent ume cent cooperative administrative study DDT per acre DDT spray DDT was found dead fish dead suckers die-off Douglas-fir drift sample Fish & Game fish mortalities fish were found Flesh fillet following spraying Horse flies hours Subsurface hours Surface insects collected insects with number Judith River July 15 l0 miles Ledford Bridge longnose suckers Madison River Montana State College Montana State Fish mountain sucker number predominant forms patrolled percent Plecoptera population pound of DDT predominant forms shown prespray samples rainbow trout Ruby River samples were collected sensitized cards September spray area Caddisflies spray day spruce budworm square yard square-yard samples Station Insects Suckers f.s. Totals tributary U.S. Forest Service Volume Mayflies Warm Springs Creek whitefish yard of immature