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29 NOTE: Variations in water hardness from 44 to 162 ppm and pH from 6.0 to 9.0 did not alter the tox- icity to cutthroat or lake trout. DICOFOL Chemical Name: 1,1-Bis(4-chlorophenyl)-2,2,2-tri= G.lacustris' chloroethanol Alternate Names: Acarin, CAS 115-32-2, ENT-23648, FW-293, Mitigan, Kelthane Principal Use: Acaricide Sample Description: Technical material, 100%1; 74.4%2 SUMMARY OF ACUTE TOXICITY 96-h LC50 Test Stage or Temp 95% CI organism wt (g) (C) (µg/L) Pteronarcys' YC2 15 650 280-1,360 Channel catfish' 0.8 18 360 290-447 Bluegill' 1.0 18 520 42.642 Largemouth bass' 0.8 18 395 Cutthroat trout' 0.1 12 53 41-68 Lake trout' 1.2 12 87 53-142 DICROTOPHOS Chemical Name: Dimethyl cis-2-dimethyl-carbamoyl-l- methylvinyl phosphate Alternate Names: Bidrin, Carbicron, CAS 141-66-2, CIBA 709, Ektafos, ENT-24482, SD 3562 Principal Use: Insecticide Sample Description: Technical material: 80%1, 90%' SUMMARY OF ACUTE TOXICITY 96-h LC50 Test Stage or Temp 95% Cl organism wt (g) (C) (mg/L) Simocephalus' I1 15 0.278 0.21-0.32 G.fasciatus' M 21 2.6 2.1-3.2 M 21 0.54 0.40-0.73 Pteronarcys' YC2 15 0.43 0.34-0.54 Bluegill' 1.0 20 24.2 14.3-41.1 Rainbow trout' 1.0 13 6.3 Channel catfish' 1.4 18 7.7 4.0-13.8 848-h EC50. DIELDRIN Chemical Name: 1,2,3,4,10,10-Hexachloro-exo-6,7- epoxy- 1,4,4a,5,6,7,8,8a-octahydro-l,4-endo-exo-5,8- dimethanonaphthalene Alternate Names: Alvit, CAS 60-57-1, Compound 47, Dieldrine, Dieldrite, ENT-16225, HEOD, Octalox, Panoram D-31 Principal Use: Insecticide Sample Description: Technical material, 85% HEOD'; photo-dieldrin 98%2 SUMMARY OF ACUTE TOXICITY 96-h LC50 Test Stage or Temp 95% CI organism wt (g) (C) (wg/L) Simocephalus' I1 15 2408 200-280 Daphnia pulex' I1 15 1908 170-210 Asellus' M 21 5.0 3.2-10.0 G. fasciatus' M 21 640 460-880