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Ecotoxicological information

Long-term toxicity to fish

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Description of key information

NOEC (fry length, fry weight) = 4.41 mg/l (TWA, mean measured)

Key value for chemical safety assessment

Fresh water fish

Fresh water fish
Effect concentration:
4.41 mg/L

Additional information

The long-term toxicity to fish is evaluated by considering data on the similar substance 1 -MSA. Justification for Read Across is given in Section 13 of IUCLID.

The effects of the test item on the early-life stage of fish (Danio rerio/Zebrafish) were determined according to OECD Guideline 210. Dimethylsulfoxide (DMSO) was used as solvent with a concentration of 0.10 ml/l dilution water. Based on the results of a range finding test the test was conducted as a dose-response test with the nominal test item concentrations 0.301, 0.723, 1.74, 4.17 and 10.0 mg/l. The test was started by placing fertilized eggs into the test vessels and it lasted 34 days (30 days post-hatch). 80 eggs of Danio rerio / zebrafish were exposed to each test concentration, the solvent control and the control (4 replicates with 20 eggs each). The water quality parameters pH-value, oxygen concentration, temperature and total hardness were within the acceptable limits. On study day 4, 95% of the control and 98% the solvent control larvae had hatched. Therefore, study day 4 was defined as post hatch day 0 (= PHD 0). Hatching success, fry growth (assessed via length and fresh weight measurements on PHD 30), morphological and behavioral effects, posthatch survival and overall survival were assessed. Specific analysis of various concentrations of the test item in the test media and the controls was carried out via HPLC-DAD. The measured concentrations of replicates and test media on study days 0 to 34 (last sampling on study day 28) were in the range of 87 to 124 % of the nominal concentrations. Since the measured concentrations were partly out of the range of ± 20% of the nominal concentration, the time-weighted arithmetic mean measured concentrations of the test item were calculated, resulting in 0.339, 0.796, 1.72, 4.41 and 10.8 mg/l, respectively.

The test item partly caused significant effects on Zebrafish in an early life stage test. For the parameters hatch, post-hatch survival and overall survival the NOEC was 10.8 mg/L. Therefore, the respective LOECs were determined to be > 10.8 mg/l. For the parameter fry growth (expressed as length and fresh weight) the NOEC was 4.41 mg/l. Therefore, the LOEC for this parameter was determined to be 10.8 mg/l.