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38 96-h LC50 96-h LC50 Test Stage or Temp 95% CI Test Stage or Temp 95% CI organism wt (g) (C) (µg/L) organism wt (g) (C) (µg/L) Bluegill 1.5 18 0.61 Pteronarcys YC2 15 7.4 0.50-0.74 5.5-10.0 Largemouth bass 2.5 18 0.31 Cutthroat trout 1.0 13 160 0.25-0.39 150-170 Yellow perch F 12 0.15 Rainbow trout 1.0 13 210a 0.12-0.18 192-230 a48-h EC50. bTested in hard water, 272 ppm CaCO,. Channel catfish 1.1 18 420 eFlow-through toxicity test. 351-502 NOTE: A wide variation in 96-h LC50's was observed Bluegill 1.0 18 110 85 141 in 18 species of invertebrates tested, ranging from 7 parts per trillion for Tipula to 320 ppb for mature cray- Largemouth bass 1.0 18 380a fish. Most values ranged from 0.5 to 10 ppb. Com- 346-417 paratively, endrin was more toxic to fish than to inver- tebrates and showed less variation in LC50's. Effects Walleye 0.8 18 350a of pH and water hardness on toxicity were not appre- 333.368 ciable, and increases in temperature from 2 ° to 29 °C aTested in hard water, 272 ppm CaC%. only doubled the toxicity to rainbow trout and blue- gills. Endrin residues accumulated rapidly in fish exposed by diet or bath, reaching levels of 400 to 2,000 EPTC times the exposure level. Mortality occurred in channel catfish when whole body residues exceeded 0.5 Chemical Name: S-Ethyl dipropylthiocarbamate ppm. Several physiological and biochemical variables were altered by endrin, including growth and repro- Alternate Names: CAS 759-94-4, Eptam, Eradicane, ductive development, adrenal and thyroid function, R-1608 serum electrolyte balance and osmoregulation, glycogen metabolism, serum protein composition, resistance to stress, and behavioral patterns. EPN Chemical Name: 0-Ethyl-0-(p-nitrophenyl) phenyl phosphonothioate Alternate Names: CAS 2104-64-5, ENT-17798 Principal Use: Acaricide, insecticide Sample Description: Technical material, 100% SUMMARY OF ACUTE TOXICITY 96-h LC50 Test Stage or Temp 95% CI organism wt (g) (C) (µg/L) G.fasciatus M 15 6.8 3.5.13.3 Palaemonetes M 21 0.6a 0.4-0.8 Principal Use: Herbicide Sample Description: Technical material, 98% SUMMARY OF ACUTE TOXICITY 96-h LC50 Test Stage or Temp 95% CI organism wt (g) (C) (mg/L) Asellus M 15 23a 15-36 G.fasciatus M 15 66a Cutthroat trout 1.0 10 17 15-19 Lake trout 0.9 10 16.2 14.8-17.7 aTested in hard water, 272 ppm CaCO.. NOTE: Variations in temperature (5° to 15°C), pH (6.5 to 8.5), or water hardness (44 to 300 ppm) did not alter the toxicity to cutthroat trout or lake trout, except for a slight increase in toxicity to cutthroat trout at pH