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Diss Factsheets

Ecotoxicological information

Additional ecotoxological information

Currently viewing:

Administrative data

Endpoint:
additional ecotoxicological information
Type of information:
experimental study
Adequacy of study:
weight of evidence
Reliability:
3 (not reliable)
Rationale for reliability incl. deficiencies:
other: No guideline study.

Data source

Reference
Reference Type:
publication
Title:
The resistance of rainbow trout (Salmo gairdnerii richardson) and roach (Rutilus rutilus (L.)) to alkaline solutions
Author:
Jordan DHM, Lloyd R
Year:
1964
Bibliographic source:
Int. J. Air Wat. Poll. Pergamon Press 1964. Vol. 8, pp. 405-409

Materials and methods

Principles of method if other than guideline:
Batches of rainbow trout were acclimatized for 5 days in solutions of pH value 6.55, 7.50 and 8.40, prepared by adding hydrochloric acid to the hard water until the required pH value was maintained when the solution was in equilibrium with air. A second experiment was made to measure the resistance of rainbow trout to alkaline solutions over a period of 15 days.
GLP compliance:
not specified
Type of study / information:
The resistance of rainbow trout to alkaline solutions was investigated.

Test material

Reference
Name:
Unnamed
Type:
Constituent
Details on test material:
- Name of test material (as cited in study report): sodium hydroxide

Results and discussion

Any other information on results incl. tables

1st experiment: It apppeared that for survival times of a few hours, the acclimatization pH value has little effect on the subsequent resistance of the fish to alkalis for short periods of exposure. However, calculation, by probit analysis, of the pH values which killed 50 per cent of the rainbow trout in 1 day showed that those fish acclimatized to a pH value of 8.40 were slightly, but significantly, more resistant to alkaline waters than those acclimatized to the lower pH values, the lethal values being 9.86, 9.91 and 10.13 for batches acclimatized to 6.55, 7.50 and 8.40.

2nd experiment: Calculation by probit analysis showed that a pH value of 9.5 would kill 50 per cent of the rainbow trout within 15 days.

Applicant's summary and conclusion