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21 trout in concentrations as low as 40 µg/L. These effects primarily involved a progressive loss of motor function to the point of immobilization after 15 and 20 days of exposure. Death, when it occurred, resulted from debilitation and other secondary effects. These sub- lethal effects were not present or only slightly exp- ressed in bluegills and channel catfish. Tests with rainbow trout revealed no significant differences in susceptibility among yolk-sac fry, swim-up fry, and fingerlings. Fingerling rainbow trout fed a diet forti- fied with 10 ppm chlorowax 5000 for 82 days showed no gross pathological effects, although they accu- mulated a whole body residue level of 1.1 ppm. However, growth of the treated fish was reduced. the toxicity by 2- to 15-fold. Toxicity to cutthroat trout was increased threefold when the pH was in- creased from 7.5 to 9.0. A similar effect was not noted j in lake trout, which were much less sensitive to chlor- pyrifos than were other species of fish. The TILC50 for lake trout was 45µg/L and the cumulative toxicity index was 5.5, indicating only slight cumulative toxic action. COPPER COUNT Chemical Name: Copper ammonium sulfate with and without sulfur CHLORPYRIFOS Alternate Names: 0xy-Cop-8L, Oxy-Cop-SLS Chemical Name: 0,0-Diethyl 0-(3,5,6-trichloro-2- Principal Use: Fungicide pyridyl) phosphorothioate Sample Description: Spray concentrate: Copper Count Alternate Names: CAS 2921-88-2, Dowco 179, S, 13%1; Copper Count N, 8%' Dursban, Lorsban SUMMARY OF ACUTE TOXICITY Principal Use: Insecticide Sample Description: Technical material, 97% SUMMARY OF ACUTE TOXICITY 96-h LC50 Test Stage or Temp 95% Cl organism wt (g) (C) (µg/L) G.lacustris M 20 0.11 0.07-0.17 Pteronarcys YC2 15 10 7-13 Claassenia YC2 15 0.57 0.40-0.80 Cutthroat trout 1.4 10 18 16-22 Rainbow trout 1.4 13 7.1 6.0-8.4 Lake trout 2.3 12 98 96-h LC50 Test Wt Temp 95% CI organism (g) (C) (µg/L) Rainbow trout' 1.0 12 121 90-164 Fathead minnow' 1.1 17 154 92-255 Bluegill' 1.2 17 13,700 9,360-20,400 Rainbow trout' 1.0 12 20.4 14.8-28.2 Fathead minnow' 1.0 17 35.9 26.3-48.9 Bluegill' 1.2 17 3,280 1,860-5,750 COPPER SULFATE 54-180 Chemical Name: Copper sulfate pentahydrate Channel catfish 0.8 18 280 206-381 Alternate Names: Blue copperas, Bluestone, Blue vitriol, CAS 1344-73-6 Bluegill 0.6 18 2.4 1.1-5.1 Principal Use: Algicide, fungicide NOTE: Variations in temperature from 2° to 18°C for Sample Description: Technical material, 100% (about rainbow trout and 13° to 29°C for bluegills increased 25% elemental copper)