Registration Dossier
Registration Dossier
Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.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.
Use of this information is subject to copyright laws and may require the permission of the owner of the information, as described in the ECHA Legal Notice.
EC number: 205-743-6 | CAS number: 149-57-5
Short-term toxicity to fish
Administrative data
Link to relevant study record(s)
Description of key information
The substance is with high probability acutely not harmful to fish
Key value for chemical safety assessment
Fresh water fish
Fresh water fish
- Dose descriptor:
- LC50
- Effect concentration:
- > 100 mg/L
Additional information
As 2-ethyhexanoic acid causes a pH-shift of the test solutions, test results were obtained from a study performed with the sodium salt of the acid (sodium 2-ethylhexanoate, CAS 19766-89-3). This substance does not cause a pH-shift and the test solutions can be regarded as neutralized solutions of the acid. Therefore, observed effects are related to the test substance and not to a pH shift.
The study was performed according to OECD guideline 203 using Oryzias latipes as test organism (NITE, J-CHECK databank, Japan 2002). This limit test was conducted under supervision of the Japanese Ministry of the Environment. This study was conducted under GLP. The test concentrations were analytically verified and deviated less than 20% from the nominal concentrations. The study was used as a key study for the assessment of the acute toxicity of CAS 149-57-5 to fish. In this study the 96-h LC50 was determined to be higher than the limit test concentration of 100 mg/L (nominal, analytically verified, rep. no.: A010465-4, J-CHECK, Japan).
It can be concluded that the substance is with high probability acutely not harmful to fish.
Information on Registered Substances comes from registration dossiers which have been assigned a registration number. The assignment of a registration number does however not guarantee that the information in the dossier is correct or that the dossier is compliant with Regulation (EC) No 1907/2006 (the REACH Regulation). This information has not been reviewed or verified by the Agency or any other authority. The content is subject to change without prior notice.
Reproduction or further distribution of this information may be subject to copyright protection. Use of the information without obtaining the permission from the owner(s) of the respective information might violate the rights of the owner.
