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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

Based on read across, alkenes C11/13/14 are not expected to be acutely toxic to fish at their limit of solubility.

Key value for chemical safety assessment

Additional information

Davi (1996) tested the acute toxicity of alkenes, C10 -14 branched and linear, C12 rich to Oncorhynchus mykiss in an OECD 203 test. The test concentration was expressed as a loading rate due to the low solubility of the test substance. No mortality was observed at the highest loading rate, so the LL50 was above the loading rate of 86mg/l WAF.

The toxicity of dodec-1 -ene to fish was investigated in an OECD 203 test with Oncorhynchus mykiss (Brixham Environmental Laboratories, 2010). Due to the low solubility of the test substance (0.12mg/l) the study was conducted as a limit test and used a solvent carrier. The test substance was mixed with the solvent before being added to the dilution water. It was then stirred for 48 hours under sealed conditions to maximise the exposure concentrations. The test was carried out with sealed test vessels and the solutions were renewed daily to minimise the loss of the test substance. Measured concentrations remained above the solubility of the test substance throughout the exposure period (measured range 0.76 -1.5 mg/l) except during the final 24 hour period when concentrations fell from 1.1 to 0.049mg/l following the final solution renewal. After 96 hours there were no mortalities in the blank control, solvent control or single exposure concentration. These results are interpreted as demonstrating that the 72 hour LC50 of dodec-1 -ene is above its limit of solubility. Due to the drop in exposure concentrations over the final 24 hours the 96 hour LC50 is not used in the assessment.