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43 96-h LC50 96-h LC50 Test Stage or Temp 95% Cl Test Stage or Temp 95% CI organism wt (g) (C) (AWL) organism wt (g) (C) (mg/L) 5 12 87 Lake trout 0 Rainbow trout' 1.0 12 8.3 . 68-110 7.0-9.9 Fathead minnow 0.3 12 298 Fathead minnow' 0.6 22 2.3 1.9.2.8 207-430 Channel catfish 1.2 20 108 Channel catfish' 0.6 22 13 11-1.6 59-201 Bluegill 0.6 20 72 Bluegill' 0.7 22 5.6 4.2-7.5 58-89 848-h EC50. Smallmouth bass F 12 91 73-113 NOTE: Test conditions and size of fish altered the tox- icity of glyphosate. Toxicity increased with increasing Yellow perch 0.6 12 177 temperature; glyphosate was twice as toxic to rainbow 149 210 t at 17 °C than at 7 °C and to bluegills at 27 °C than tro u at 17°C. Toxicity was 2 to 4 times greater to bluegills and rainbow trout at pH 7.5 to 9.5 than at pH 6.5. Tox- GLYPHOSATE icity of Roundup (41% liquid) to midge larvae, rainbow trout, or bluegills did not change when test solutions Chemical Name: N-(Phosphonomethyl) glycine were aged from 1 to 7 days. The egg stage was the least sensitive early life stage for both rainbow trout and Alternate Names: Roundup, MON-2139 channel catfish. Tests with sac fry and swim-up fry yielded 96-h LC50 s ranging from 2.4 to 4.3 mg/L. Principal Use: Herbicide Fingerlings yielded 96-h LC50's of 8.3 mg/L for rain- bow trout and 13 mg/L for channel catfish. Overall, the Sample Description: Technical material, 96.7%1; Roundup formulation was 3 to 42 times more toxic liquid, 41%2 than the technical grade material. SUMMARY OF ACUTE TOXICITY 96-h LC50 HEPTACHLOR Test Stage or Temp 95% CI organism wt (g) (C) (mg/L1 Chemical Name: 1,4,5,6,7,8,8-Heptachloro-3a,4,7,7a- Rainbow trout' 0.8 12 130 130 tetrahydro-4,7-methanoindene 10 -156 Fathead minnow' 6 0 20 97 Alternate Names: CAS 76-48-8, E-3314, ENT-15152, . 79-120 H-34, Heptachlore, Heptagran, Heptamul, Velsicol 104 Channel catfish' 2.2 22 130 108-156 Principal Use: Insecticide Bluegill' 0.9 22 135 Sample Description: Technical material, 99%1; hepta- 113-162 chlor epoxide2 Daphnia magna' 11 22 3.Oa SUMMARY OF ACUTE TOXICITY 2.6-3.4 96-h LC50 G. pseudolimnaeus' M 12 43 Test Stage or Temp 95% Cl 28 66 organism wt (g) (C) (µglL) Chironomus' 14 22 558 Simocephalus' 11 15 478 31-97 32-68