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Ecotoxicological information

Long-term toxicity to fish

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Description of key information

Long-term toxicity to fish: 60-d post-hatch NOEC ≥7.9 µg/l (time weighted mean measured) (highest concentration tested) (OECD 210), based on hatching, larval survival, abnormal appearance and behaviour in Oncorhynchus mykiss. This is supported by 35-day LC50: >5.3 μg/l (mean measured) and NOEC: ≥5.3 μg/l (mean measured) (OECD 305) based on mortality in Pimephales promelas.

Key value for chemical safety assessment

EC10, LC10 or NOEC for freshwater fish:
7.9 µg/L

Additional information

A 60-d post-hatch NOEC of ≥7.9 µg/l (time weighted mean measured) has been determined for the effects of decamethyltetrasiloxane on hatching, larval survival, abnormal appearance and behaviour in Oncorhynchus mykiss in the fish early-life stage test (OECD 210). In view of the exposure regime it is likely that the test organisms were exposed primarily to the tested substance rather than its degradation products.

Supporting evidence is provided by mortality data in a bioconcentration study. A 35-day LC50 value of >6.7 μg/l (nominal), >5.3 μg/l (mean measured) and NOEC of ≥6.7 μg/l (nominal), ≥5.3 μg/l (mean measured) have been determined for the effects of the test substance on mortality of Pimephales promelas.