7941

• UCREFRP Catalog Number: 7941
• Author: Johnson, W. W. and M. T. Finley
• Title: Editor
• USFW Year: Series
• USFW - Doc Type: 1980
• Copyright Material: NO

39
6.5. The TILC50 for cutthroat trout was 7.2 mg/L and NOTE: Variations in water hardness (44 to 272 ppm)
the cumulative toxicity index was 3.2, indicating only did not alter toxicity to cutthroat trout.
slight cumulative toxic action.
ETHOFUMESATE
ETHION Chemical Name: 2-Ethoxy-2,3-dihydro-3,3-dimethyl-5-
benzofuranyl methanesulfonate
Chemical Name: 0,0,0;0'-Tetraethyl S,S'-methylene Alternate Names: Fluoromidine, NC-4780, Nortron
biphosphorodithioate
Principal Use: Herbicide
Alternate Names: CAS 563-12-2, Diethion, ENT-
24105, NIA-1240, Nialate Sample Description: Technical material, 96%1; Formu-
lation, 25%2
Principal Use: Acaricide, insecticide
SUMMARY OF ACUTE TOXICITY
Sample Description: Technical material, 100%
96-h LC50
SUMMARY OF ACUTE TOXICITY Test Wt Temp 95% CI
h organism (g) (C) (mg/L)
LC50
96-
Test Stage or Temp 95% CI Rainbow trout' 1.0 12 0.8
organism wt (g) (C) (µg/L) 0.5-1.0
Simocephalus I1 15 4.7a Bluegill' 1.5 18 2.5
3.2-6.9 1.0-5.0
Daphnia magna 11 21 0.0568 Rainbow trout' 1.0 12 0.5
0.038-0.082 0.1-1.0
Daphnia pulex 11 15 2.88 Bluegilla 1.5 18 6.5
1.5-5.3 3.5-9.0
G.fasciatus M 21 1.8
1.3-2.4
Palaemonetes M 15 5.6b FENAC
3.2.9.8
Chemical Name: 2,3,6-Trichlorophenyl acetic acid
Pteronarcys YC2 15 2.8
1.8-4.2 Alternate Names: CAS 85-34-7, Chlorfenac, Kanepar,
2,3,6-TCA, Tri-fen, Trifene
Cutthroat trout 1.0 13 720
580-900 principal Use: Herbicide
Rainbow trout 1.0 13 500b
355-705
Sample Description: Technical material, 50%
Fathead minnow F 18 720 SUMMARY OF ACUTE TOXICITY
Channel catfish 1.2 18 7,600 96-h LC50
6,390-9,030 Test Stage or Temp 95% CI
organism wt (g) (C) (mg/L)
Bluegill 0.8 18 210
Simocephalus I1 15 6.6e
141-313 4.5-9.6
Largemouth bass 2.8 18 173b
Daphnia pulex 11 15 4.5e
158-190 3.2-6.3
848-h EC50.
bTested in hard water, 272 ppm CaCO,. G. fasciatus M 15 > 100