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48 <br />SUMMARY OF ACUTE TOXICITY <br /> 96-h LC50 <br /> 96-h LC50 Test Stage or Temp 95% CI <br />Test Stage or Temp 95% CI organism wt (g) (C) (µg/L) <br />organism wt (g) (C) (µg/L) <br /> Brown trout 1.1 12 101 <br /> 84-115 <br />Simocephalus 11 15 3.5a <br /> 2.6-4.8 Lake trout 0.3 12 76b <br /> <br />Daphnia magna <br />I1 <br />15 <br />1.0a 47-123 <br /> 0.7-1.4 Goldfish 0.9 18 10,700 <br /> 8,340-13,800 <br />Daphnia pulex I1 15 1.8a <br /> 1.4-2.4 Carp 0.6 18 6,590 <br /> <br />Cypridopsis <br />M <br />21 <br />47a 4,920-8,820 <br /> 32-69 Fathead minnow 0.9 18 8,650 <br /> 6,450-11,500 <br />Asellus M 21 3,000 <br /> 1.500-8.500 Black bullhead 1.2 18 12,900 <br /> 10,700-15,600 <br />G. fasciatus M 21 0.76 <br /> 0.63-0.92 Channel catfish 1.5 18 8,970 <br /> <br />Orconectes <br />IE <br />15 <br />180b 6,780-12,000 <br /> 140-230 Green sunfish 1.1 18 175 <br /> <br />Palaemonetes <br />M <br />21 <br />90b 134-228 <br /> 67-120 Bluegill 1.5 18 103 <br /> <br />Pteronarcys <br />YC2 <br />15 <br />10 87-122 <br /> 7.0-13 Redear sunfish 3.2 24 62 <br /> <br />Pteronarcella <br />N <br />15 <br />1.1 58-67 <br /> 0.8-1.5 Largemouth bass 0.9 18 285 <br /> <br />Claassenia <br />YC2 <br />15 <br />2.8 254-320 <br /> 1.4-4.3 Yellow perch 1.4 18 263 <br /> 205-338 <br />Isoperla YCl 15 0.69 <br /> 0.20-2.4 Walleye 1.3 18 64 <br /> 59-70 <br />Lestes J 15 10 <br /> 6.5-15 a48-h EC50. <br /> bTested in hard water (162-272 ppm CaC0J. <br />Hydropsyche J 15 5.0 <br /> 2.9-8.6 <br />Limnephilus J 15 1.3 <br /> 0.8-2.0 <br /> NOTE: In lake trout, fry (0.3 g) were twice as sensitive <br />Atherix J 15 385 as fingerlings (4.5 g) to malathion. An increase in tem- <br /> 246-602 perature from 10° to 21°C caused an 11-fold decrease <br /> <br />Coho salmon <br />0 <br />9 <br />12 in toxicity to the daphnid Simocephalus; however, an <br /> . 170 increase from 7 ° to 29 °C caused a fourfold increase in <br /> 160-180 toxicity to bluegills. Variations in water hardness did <br />Cutthroat trout 1.0 12 280 not appreciably alter the toxicity to fish or inver- <br /> 270-310 tebrates. Mixtures of malathion with Baytex, para- <br /> thion, EPN, Perthane, or carbaryl were synergistic in <br />Rainbow trout 1.4 12 200 their toxicity to rainbow trout and bluegills. Com- <br /> 160-240 binations of malathion with DDT or toxaphene were