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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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

96 hr LC50 in Zebra fish ((Brachydanio rerio):  7.6 mg/L.
96 hr LC50 in Medaka ((Oryzia latipes): 7 mg/L.
QSAR estimate 2.29mg/l.

Key value for chemical safety assessment

Fresh water fish

Fresh water fish
Effect concentration:
7.6 mg/L

Additional information

In a reliable reliable acute toxicity study of ENB in fish, the 96-hr LC50for Zebra fish (Brachydanio rerio) was 7.6 mg/L and the 96-hr NOEC was 5.02 mg/L. In a guideline (OECD 203) and GLP study, the Environment Agency of Japan (1999a) reported a 96 hr LC50 value for ENB of 7.00 mg/l (95% confidence limits of 6.17 and 8.51 mg/l) in Medaka (Oryzias latipes). The key parameter was selected from the the only original study report that was available.