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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

The substance was not acutely toxic to freshwater fish when tested according to OECD guideline 203 (Fish, acute toxicity test), the substance is predicted to possess a 96-hour LC50 in freshwater fish that is equal to 2993 mg/L.

Key value for chemical safety assessment

LC50 for freshwater fish:
2 993 mg/L

Additional information

Three studies addressing short-term toxicity to fish are presented in the dossier. Please refer to the document attached to Section 13 for further discussion of the studies.

Short-term toxicity to fish.001 – Fathead minnow – 1998 - key: Acute toxicity to the freshwater fish Pimephales promales (Fathead minnow) was assessed according to OECD guideline 203 (Fish, acute toxicity test) under Good Laboratory Practices (GLP). Five concentrations at nominal values of 1296, 2160, 3600, 6000, and 10000 mg/L were utilized in this test with 20 fish per concentration under static conditions. Temperature was maintained at 22 ± 2°C and pH ranged between 8.2 and 8.6. The percentage of dead fish was recorded at 24, 48, and 96 hours, along with visible abnormalities. The following validity criteria were met: mortality in the control did not exceed 10% at the end of the test; dissolved oxygen concentrations remained above 60% of the air saturation value at the end of the test; and the pH of the control and of the test solution did not vary by more than one unit during the course of the test. The concentration of the test item was maintained within 80% of the initial value throughout the test for the 3 lowest doses (1296, 2160, and 3600); however, the 2 highest doses were not maintained within 80% of the initial value throughout the test. The measured concentrations at the end of the test were 1170, 1848, 2993, 3758, and 6090 mg/L, which were used to express the results of the test. The mortality: in 1170, 1848, 2993, 3758, and 6090 groups were 0, 0, 50, 100 and 100% and one fish in the 1848 mg/L was observed to be lethargic. The 96 h LC50 was calculated to be 2993 mg/L with 95% confidence limits of 1848 and 3758 mg/L.

Short-term toxicity to fish.003 – Golden orf - 1978: Acute toxicity to the freshwater fish Leuciscus idus melanotus (Golden orf) was assessed according to Deutsche Einheitsverfahren zur Wasser-, Abwasser- und Schlammuntersuchung. L 15: Fischtest (Bestimmung der Wirkung von Wasserinhaltsstoffen auf Fische) not according GLP (pre-dates GLP). The fish were exposed to the substance under static conditions for 48 hours. The 48–hour LC50 was determined to range between 4600 and 4880 mg/L. This lower toxicity over a shorter exposure period is in keeping with the result of the key study.

Short-term toxicity to fish.002 - Goldfish - 1973: Acute toxicity to the freshwater fish Carassius auratus (Goldfish) was assessed according to OECD guideline 203 (Fish, acute toxicity test) not according GLP (pre-dates GLP). The fish were exposed to the substance under static conditions for 24 hours.  The median tolerance limit (TLm: the concentration at which 50% animals survive) at 24 hours was reported to be greater than 5000 mg/L. Detailed information was not provided in the report however, the results are in line with the key study.