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Ecotoxicological information

Long-term toxicity to fish

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Description of key information

In accordance to Regulation (EC) No. 1907/2006, Annex IX, Column 2, 9. 1, as the RCR freshwater is < 1 no further effects of methylcyclohexane on aquatic organisms need to be investigated and a long-term test with fish is therefore not required

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In accordance with Regulation (EC) No 1907/2006, Column 2 of Annex IX, section 9.1.6 long-term toxicity tests on fish does not need to be investigated if the outcome of the chemical safety assessment shows no indication of risk on aquatic organisms from exposure to the substance in question. Aquatic PNECs for methylcylcohexane have been derived using assessment factors. The risk characterization ratio (RCR) has demonstrated that there is no indication of risk i.e. PEC/PNEC freshwater < 1 from current exposure conditions to methylcyclohexane.

Furthermore, considering the high volatility and ready biodegradation, the substance is expected to be rapidly removed from the water column. Therefore chronic exposure of aquatic organisms is unlikely to occur. Nevertheless, available data on algae indicate that a chronic toxicity of methylcyclohexane exists with a NOErC beeing ≤ 0,1 mg/L, resulting in chronic classification (CLP: chronic 1). It is not expected, that further testing on fish would result in a more stringent classification for methylcylohexane, since fish show higher ecotoxicity values than algae and aquatic invertebrates in acute tests.

In conclusion, in accordance to Regulation (EC) No. 1907/2006, Annex IX, Column 2, 9. 1, as the RCR freshwater is < 1 no further effects of methylcyclohexane on aquatic organisms need to be investigated and a long-term test with fish is therefore not required.