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15 <br />crayfish, damselfly larvae, and midge larvae) reached Temperature had no appreciable effect on toxicity. <br />plateaus which were 4 to 87 times that of the concen- Variations in pH altered toxicity more than any other <br />tration to which they were exposed. A 50% reduction test condition. Benomyl was about 5 times more toxic <br />I: <br /> <br />in these residues occurred within 24 h after the organ- i <br />to rainbow trout and bluegills at pH's 6.5 or 7.5 than <br />isms were transferred to fresh water. In flow-through at 8.5. Benomyl was equally toxic to all life stages of <br />tests, daphnids showed a 21-day LC50 of 0.65 mg/L, rainbow trout; 96-h LC50's ranged from 120 to 280 <br />and a concentration of 0.38 mg/L caused a 50% µg/L. However, fry of channel catfish were consid- <br />decrease in reproduction. erably more sensitive to benomyl than were finger- <br /> lings. The 96-h LC50's for yolk-sac fry, swim-up fry, <br /> and fingerlings were 5.6, 12, and 29 µg/L, respectively. <br />BENOMYL Toxicity of the MBC metabolite was very similar to <br /> that of technical grade benomyl for all life stages of <br />Chemical Name: Methyl 1-(butyl carbamoyl)-2- rainbow trout and channel catfish tested. <br />benzimidazolecarbamate <br /> BENZENE HEXACHLORIDE <br />Alternate Names: Benlate, Tersan <br />Principal Use: Fungicide Chemical Name: 1,2,3,4,5,6-hexachlorocyclohexane <br />Sample Description: Technical material, 99%'; wet- Alternate Names: Benzahex, Benzex, BHC, Dol, <br />table powder, 50%1; methyl-2-benzimidazole= Dolmix, FBHC, HCCH, HCH, Hexachlor, <br />carbamate, 99% (MBC metabolite' Hexachloran, Hexafor, Hexaclan, Soprocide <br />SUMMARY OF ACUTE TOXICITY Principal Use: Insecticide <br />96-h LC50 Sample Description: Technical material, 41.5% <br />Test Wt Temp 95% CI <br />organism (g) (C) (µg/L) SUMMARY OF ACUTE TOXICITY <br />Rainbow trout' 1.2 12 170 96-h LC50 <br />120-230 Test Stage or Temp 95% CI <br /> <br />Fathead mi <br />' 0 <br />9 22 2 organism wt (g) (C) (µg/L) <br />nnow <br />. <br />,200 <br />1,590-3,040 Daphniapulex Il 16 6808 <br />Channel catfish' 1.2 22 29 G. lacustris M 21 78 <br />22-37 54-113 <br />Bluegill' 0.9 22 850 Pteronarcys YC2 15 < 18 <br />550.1,300 <br /> Cutthroat trout 1.0 13 9 <br />Rainbow trout, 1.0 12 310 8-10 <br />250-390 <br /> Rainbow trout 1.0 13 18 <br />Fathead minnow, 0.5 22 1,900 15-20 <br />1,430-2,530 <br /> Goldfish 1.0 18 348 <br />Channel catfish, 1.2 22 28 261-466 <br />21-34 <br /> Fathead minnow 1.0 18 125 <br />Bluegill, 0.6 22 1,200 96-164 <br />900-1,590 <br /> Channel catfish 1.1 18 105 <br />Rainbow trout' 0.2 12 370 85-129 <br />268-510 <br /> Bluegill 1.5 18 67 <br />Channel catfish' 0.8 22 16 51-96 <br />11-23 <br /> Largemouth bass 0.8 18 41 <br />NOTE: The toxicity of benomyl was altered by water 36-47 <br />hardness and pH and by life stage of the fish tested. 848-h EC50