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34 96-h LC50 DIURON Test Stage or Temp 95% CI e Temp 95% C organism wt Chemical Name: 3-(3,4-Dichlorophenyl)-1,1-dimethyl= urea Bluegill 1.3 12 245 175-342 Alternate Names: CAS 330-54-1, Dichlorofenidim, DCMU, Di-on, Diurex, DMU, Karmex, Marmer, Yellow perch 0.6 12 60 Urox D, Vonduron 39-93 aTested in hard water, 272 ppm CaCO.. Principal Use: Herbicide NOTE: Variations in temperature from 7° to 22°C did Sample Description: Technical material, 95%1; wet- not alter the toxicity to bluegills. A change in pH to table powder, 80%1 9.5 increased toxicity twofold, whereas an increase in hardness from 40 to 300 ppm decreased toxicity by SUMMARY OF ACUTE TOXICITY one-half to one-third. Similar pH effects were noted in 96-h LC50 black bullheads and yellow perch. Test Stage or Temp 95% CI organism wt (g) (C) (mg/L) Simocephalus' I1 15 2.Oa 1.4-2.8 DISULFOTON Daphnia pulex' 11 15 1.4a Chemical Name: 0,0'Diethyl S-[2-(ethylthio) ethyl] 1.0-1.9 phosphorodithioate Asellus' M 15 15.5 Alternate Names: Bay 19639, CAS 298-04-4; Di- 7.2-33.4 Syston, Dithiodemeton, Dithiosystox, ENT-23427, G. fasciatus' M 21 0.16 Frumin AL, M-74, Solvirex, Thiodemeton 0.13-0.19 Principal Use: Insecticide, acaricide Pteronarcys' YC2 15 1.2 0.9-1.7 Sample Description: Technical material, 98% Cutthroat trout' 0.3 10 1.4 SUMMARY OF ACUTE TOXICITY 1.1-1.9 96-h LC50 Rainbow trout' 0.8 13 4.9 Test Stage or Temp 95% CI 4.1-5.9 organism wt (g) (C) (µg/L) 7 5 10 2 ' 1 k . . e trout La G. fasciatus M 15 52 2.4-3.0 49-58 Bluegill' 0.8 18 8.2 Palaemonetes M 21 3.9a 7.4-9.1 2.7-5.7 Rainbow trout' 1.2 13 16 Pteronarcys YC2 15 5.0 11-23 3.7-6.7 a48-h EC50. Rainbow trout 1.2 13 1,850 Fathead minnow 1.0 18 4,300 NOTE: Increases in temperature from 2° to 18°C for trout and 7 ° to 24 °C for bluegills had little effect on Channel catfish 0.8 18 4,700 acute toxicity. Changes in pH from 6.5 to 8.5 and hard- ness from 44 to 300 ppm did not alter toxicity to trout Bluegill 0.3 24 300 or bluegills. A substantial decrease in toxicity was noted in test solutions aged from 1 to 4 weeks; LC50 Largemouth bass 0.7 18 60 values were as much as ninefold higher. The largest aTested in hard water, 272 ppm CaCO3. change seemed to occur between 2 and 3 weeks of