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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Ecotoxicological information

Short-term toxicity to fish

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Administrative data

Link to relevant study record(s)

Description of key information

Acute fish toxicity (OECD 203): Oncorhynchus mykiss, 96 h LC50 = 20 mg/L

Key value for chemical safety assessment

Fresh water fish

Fresh water fish
Effect concentration:
20 mg/L

Additional information

Data availability

There is a valid study available for i-BMA.



The key study in freshwater fish is an OECD 203 guideline study in rainbow trout (Onchorynchus mykiss) with an LC50-96h of 20 mg/L.

There is no data on marine fish, but studies with the common metabolite of the category lower methacrylates, methacrylic acid (MAA), indicate that marine species are not expected to be more sensitive to methacrylates than freshwater species. The marine ecotoxicity of MAA was investigated in a series of experiments with marine fish, invertebrates and algae. There was no evidence that MAA was more toxic to marine species. Quite to the contrary the marine organisms tended to be of equal or lower sensitivity than the corresponding freshwater test organisms. The 96 h LC50 in the marine fish Scophthalmus maximus (Turbot) was 833 mg/L. The corresponding freshwater 96h-LC50 in the key study with MAA was 85 mg/L in Oncorhynchus mykiss (rainbow trout).