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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

The 96-hour LC50 value for rainbow  trout (in freshwater ) exposed to methyl bromide was 3.9 mg/l. The 95% confidence limits were 2.9 and 4.6 mg/l.
The 96-hour no mortality concentration was 2.9 mg/l. 
The 96 hour LC50 value for zebrafish exposed to methyl bromide was 56.28 mg/l. The 95% confidence limits were 47.75 to 66.34 mg/l.
The 96 hour LC50 values for bluegill sunfish and tidewater silversides (freshwater and saltwater , respectively) were 11 and 12 mg/l respectively. 95% confidence limits were not determined.
Methyl bromide delivered under experimental conditions (i.e. replicating concentrations that have been observed in drainage ditches) is acutely toxic to carp. Some fish at the 28 mg/l and all fish at the 18.5 mg/l test concentrations that survived exposure died later. The delayed reaction and behaviour (surfacing and air breathing) suggests an effect upon the respiratory function. The 4h LC50 of methyl bromide was found to be 17 mg/l.

Key value for chemical safety assessment

Fresh water fish

Fresh water fish
Effect concentration:
3.9 mg/L

Marine water fish

Marine water fish
Effect concentration:
12 mg/L

Additional information

96 Hour-LC50, 3.9 mg/l (Rainbow Trout);

56.28 mg/l (Zebrafish);

11 and 12 mg/l ( bluegill sunfish and tidewater silversides);

17 mg/l ( carp).

Methyl Bromide is very toxic to aquatic life.