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26 stand stress. Food seems to be more important than 96-h LC50 water as a source of body residues. Although DDT was Test Stage or Temp 95% CI not observed to affect gonad maturation, the mortal- organism wt (g) (C) (Ag/L) ity of fry produced by treated parents was high, espe- cially during the terminal stages of yolk absorption. DEF Chemical Name: S,S,S,-Tributyl phosphorotrithioate Alternate Names: CAS 78-48-8, De-Green, E-Z-OffD, Fos-Fall "A," Ortho Phosphate Defoliant Principal Use: Defoliant herbicide Sample Description: Technical material, 95% SUMMARY OF ACUTE TOXICITY 96-h LC50 Test Stage or Temp 95% CI organism wt (g) (C) (µg/L) G. fasciatus M 21 100 68-150 Pteronarcys YC2 15 2,100 1,500-2,900 Rainbow trout 0.6 13 660 560-750 Bluegill 0.6 18 620 390-975 DEMETON Chemical Name: Mixture of 0,0-diethyl 0-[2-(ethyl= thio)ethyl] phosphorothioate and 0,0-diethyl S-[2- ethylthio)ethyl] phosphorothioate Alternate Names: Systox Principal Use: Systemic insecticide-acaricide Sample Description: Technical material, 94% SUMMARY OF ACUTE TOXICITY 96-h LC50 Test Stage or Temp 95% Cl organism wt (g) (C) (µg/L) Daphnia pulex I1 15 14.Oa 10.4-18.7 G. fasciatus M 15 78 42-140 Rainbow trout 1.4 12 600 483-745 Channel catfish 1.2 18 3,700 3,410-4,020 Largemouth bass 0.7 18 148b 136-162 Walleye 1.3 18 230b 203-260 848-h EC50. bTested in hard water, 272 ppm CaCO.. DIAZINON Chemical Name: 0,0-Diethyl 0-(2-isopropyl-6-methyl-4- pryimidinyl) phosphorothioate Alternate Names: AG-500, Alfa-tox, Basudin, CAS 333-41-5, Dazzel, Diazajet, Diazide, Diazol, ENT- 19507, Gardentox, Neocidol, Nucidol Principal Use: Insecticide Sample Description: Technical material, 89%1, 92W SUMMARY OF ACUTE TOXICITY 96-h LC50 Test Stage or Temp 95% CI organism wt (g) (C) (µg/L) Simocephalus' I1 15 1.48 1.2-1.6 Daphnia pulex' 11 15 0.8a 0.6-1.1 G. fasciatus' M 21 0.20 0.15-0.28 Pteronarcys' YC2 15 25 20-30 Rainbow trout' 1.2 13 90 Cutthroat trout' 2.0 12 1,700b 1,390-2,090 Lake trout' 3.2 12 602b 400-906