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Short-term toxicity to fish

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Description of key information

96 h LC50 >0.25 mg/L; 96 h NOEC 0.25 mg/L, Oncorhynchus mykiss, OECD 203, Muddiman 2013a

Key value for chemical safety assessment

Additional information

The short term toxicity of the test material to fish (Oncorhynchus mykiss) was investigated in a study conducted in accordance with the standardised guideline OECD 203 under GLP conditions.

Rainbow trout were exposed to a limit value of the test material at a nominal concentration of 100 mg/L for 96 hours under static conditions. A control group was exposed to the dilution water under the same conditions.

This was a limit of solubility test as the material was not soluble in water. The nominal solution was prepared and stirred overnight and allowed to stand for approximately 4 hours. The solution used in the test was transferred using a syphon to avoid the transference of any settled test material.

Following 96 hours of exposure, no mortality or adverse effects were observed among fish exposed to the control or test material. The measured concentrations were very low and therefore the test was reported using the geometric mean measured test concentration.

Under the conditions of the study, the 96-hour LC50 value of the test material was calculated to be >0.25 mg/L (geometric mean measured concentration). The NOEC was calculated as 0.25 mg/L (geometric mean measured concentration).

The study was conducted to GLP and a standardised guideline. It was therefore assigned a reliability score of 1 and considered suitable for assessment as an accurate reflection of the test substance.

The available data are considered to be complete and the result determined, 96 h LC50 >0.25 mg/L, was taken forward for risk assessment.