Registration Dossier

Ecotoxicological information

Short-term toxicity to fish

Currently viewing:

Administrative data

Endpoint:
short-term toxicity to fish
Type of information:
experimental study
Adequacy of study:
supporting study
Reliability:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
other: Study conducted to basic scientific principles, although only useful as supporting information as the result is an outlier compared to the weight of evidence from other results.

Data source

Reference
Reference Type:
publication
Title:
Acute toxicity of manganese to brown trout (salmo trutta) in hard water
Author:
Davies H & Brinkman S
Year:
1995
Bibliographic source:
Federal aid Project #F-243, Colorado Division of Wildlife, Fort Collins, Colorado

Materials and methods

Test guideline
Qualifier:
no guideline followed
Principles of method if other than guideline:
A flow-through toxicity test using a modified Mount and Brungs diluter which delivered two liters of each concentration per cycle to 92 litre aquaria.Median lethal concentration (LC50) was detemlined using probit (Finney 1971) and Spearman-Karber (Hamilton et al. 1977 and 1978) methods
GLP compliance:
not specified

Test material

Reference
Name:
Unnamed
Type:
Constituent

Sampling and analysis

Analytical monitoring:
not specified

Test organisms

Test organisms (species):
Salmo trutta

Study design

Test type:
flow-through
Water media type:
freshwater
Limit test:
no
Total exposure duration:
96 h

Results and discussion

Effect concentrations
Duration:
96 h
Dose descriptor:
LC50
Effect conc.:
49.9 mg/L
Conc. based on:
other: Mn
Basis for effect:
mortality

Any other information on results incl. tables

Manganese concentrations were close to nominal values and were constant throughout the experiment. The LC50 in hard water (49.9mg Mn/L) is considerably higher than that for brown trout in much softer water (3.8 mg Mn/l) (Davies and Brinkrnan 1994). Therefore the difference between LC50s is due primarily to differences in water quality characteristics.

Applicant's summary and conclusion

Validity criteria fulfilled:
not specified
Conclusions:
The LC50 was 49.9 mg Mn/L.