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Ecotoxicological information

Long-term toxicity to fish

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Endpoint:
fish early-life stage toxicity
Type of information:
read-across from supporting substance (structural analogue or surrogate)
Adequacy of study:
key study
Justification for type of information:
See the read-across report attached in Section 13
Reason / purpose for cross-reference:
read-across source
Duration:
6 d
Dose descriptor:
NOEC
Effect conc.:
0.55 mg/L
Conc. based on:
other: Mn
Basis for effect:
length
Endpoint:
fish early-life stage toxicity
Type of information:
experimental study
Adequacy of study:
key study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
guideline study with acceptable restrictions
Justification for type of information:
See the read-across report attached in Section 13.
Qualifier:
equivalent or similar to guideline
Guideline:
OECD Guideline 210 (Fish, Early-Life Stage Toxicity Test)
GLP compliance:
not specified
Analytical monitoring:
yes
Test organisms (species):
Salvelinus fontinalis
Test type:
flow-through
Water media type:
freshwater
Limit test:
no
Total exposure duration:
65 d
Key result
Duration:
65 d
Dose descriptor:
NOEC
Effect conc.:
0.55 mg/L
Conc. based on:
other: Mn
Basis for effect:
length

Weight:

Growth, as measured by terminal body weight, was significantly reduced by exposure to Mn . The NOECs based on growth for the ELS brook trout tests in 30 and 150 hardness were 0.85 and 3.53 mg Mn/litre, respectively while the LOECs were 2.18 and 7.53 mg Mn/litre, respectively. For brook trout fry, the NOEC and LOEC in the 30 hardness experiment was 2.53 and 5.35 respectively. In the 150 hardness, the NOEC and LOEC was 1.71 and 3.59 respectively.

Length:

Lengths were collected at termination of tests. In the test conducted at 30 hardness, the NOEC and LOEC based on length (0.55 and 0.85 mg/L, respectively) were more sensitive than either weight or mortality. For the test conducted in 150 hardness water, the NOEC and LOEC based on length was 3.53 and 7.53.

Hatching:

Hatching success exceeded 90 percent in all treatments and was unaffected by manganese exposure over the range of concentrations tested.

Table 1: Hatching success

Total Mn (mg/L)

Hatching success (%)

Mean time to hatch (days)

Total Mn (mg/L)

Hatching success (%)

Mean time to hatch (days)

30 Hardness

150 Hardness

0.03

100

9.1

<0.02

97.5

10.4

0.36

97.5

9.1

0.78

100

10.4

0.55

100

9.4

1.68

97.5

10.5

0.85

100

9.0

3.53

97.5

10.6

2.18

97.5

9.2

7.53

100

10.0

4.48

97.5

9.0

15.65

95

9.2

8.94

97.5

8.2

34.34

97.5

7.3

19.90

95

7.1

73.72

95

4.8

Table 2: Effect data

Mortality

Length

Weight

NOEC mg/L

LOEC mg/L

NOEC mg/L

LOEC mg/L

NOEC mg/L

LOEC mg/L

30 Hardness

2.18

4.48

0.55

0.85

0.85

2.18

150 Hardness

7.53

15.65

3.53

7.53

3.53

7.53

Table 3: water quality characteristics 

Statistics

Hardness (as CaCO3) mg/L

Alkalinity (as CaCO3) mg/L

pH

Dissolved oxygen mg/L

Temperature °C

Conductivity µS/c,

 

30 Hardness

Mean

31.2

24.6

7.19

8.95

12.2

62.3

Range

24.4 - 35.2

15.8 - 32.6

6.26-7.96

7.1 - 9.8

11.0 - 13.2

52.7 - 70.5

 

150 Hardness

Mean

155.5

111.0

7.43

8.80

12.1

274

Range

148.4 -164.2

101.4 -125.2

6.97 -7.96

7.4 -9.9

11.1 -12.8

255 -297

Table 4: Summary of anions for laboratory dilution waters

Parameter

mg/L

30 Hardness

150 Hardness

Mean

Range

Mean

Range

Fluoride

0.65

0.20 – 0.80

0.60

0.50 – 0.90

Chloride

1.42

0.80 – 1.80

6.75

2.00 – 8.20

Nitrate

0.94

0.50 – 5.40

6.16

0.70 – 7.20

Phosphate

<0.5

 - -

<0.5

 - -

Sulphate*

7.0

7.0 – 7.1

55.0

52.0 – 59.6

*Data represents measurements from control tank only

Validity criteria fulfilled:
yes
Remarks:
with the exception that the daily temperatures are not reported
Conclusions:
The No Observable Effect Concentration (NOEC) was 0.55 mg Mn/L.

Description of key information

Under the conditions of the study the 65 day NOEC, in terms of length, was 0.55 mg Mn/L. Result read-across from manganese sulphate.

Key value for chemical safety assessment

Fresh water fish

Fresh water fish
Dose descriptor:
NOEC
Remarks:
Result quoted in mg Mn/L
Effect concentration:
0.55 mg/L

Additional information