Hard.
in mg/L

Fluoride
in mg/L

Reference

Conditions

Organisms

44*

_

Angelovic et al., 1961b

all died, 23.8°C

Oncorhynchus mykiss

12

4.0

Herbert & Shurben, 1964

LC₅

Oncorhynchus mykiss

45

113

Herbert & Shurben, 1964

all died

Oncorhynchus mykiss

45

75

Herbert & Shurben, 1964

no deaths

Oncorhynchus mykiss

320

200

Herbert & Shurben, 1964

all died

Oncorhynchus mykiss

320

100

Herbert & Shurben, 1964

no deaths

Oncorhynchus mykiss

12*

5-40

Kaplan et al., 1964

no deaths, 25°C

Rana pipiens, frog

12*

50

Kaplan et al., 1964

5% died in 20-d, 25°C

Rana pipiens, frog

12*

100

Kaplan et al., 1964

25% died in 30-d, 25°C

Rana pipiens, frog

12*

150

Kaplan et al., 1964

35% died in 30-d, 25°C

Rana pipiens, frog

12*

200

Kaplan et al., 1964

63% died in 30-d, 25°C

Rana pipiens, frog

12*

250

Kaplan et al., 1964

100% died in 30-d, 25°C

Rana pipiens, frog

12*

300

Kaplan et al., 1964

100% died in 30-d, 25°C

Rana pipiens, frog

250

205

Dave, 1984

24-h EC₅₀, 20°C

Daphnia magna

250

98

Dave, 1984

48-h EC₅₀, 20°C

Daphnia magna

250

9

Dave, 1984

21-d, reduced survival

Daphnia magna

250

4.4

Dave, 1984

21-d, reduced growth and reproduction

Daphnia magna

170*

1000

Ellis, 1937

all died in 60-h

goldfish

44*

looo

Ellis, 1937

all died in 12-h

goldfish

170*

100

Ellis, 1937

no effect in 4-d

goldfish

44*

226

Holland et al., 1960

1 died in 35-h

Silver salmon

320

100

Vallin, 1968

21 day survival

Oncorhynchus mykiss

44*

5.0

Sanders & Cope, 1966

48-h EC₅₀, **

Daphnia pulex

44*

10.0

Sanders & Cope, 1966

48-h EC₅₀, **

Simocephelus serrulatus

170*

307

LeBlanc, 1980

24-h EC₅₀

Daphnia magna

170*

154

LeBlanc, 1980

48-h EC₅₀

Daphnia magna

170*

50

LeBlanc, 1980

no effect

Daphnia magna

170*

122

Bringman & Kuhn, 1959b

48-h EC_l00

Daphnia magna