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Ecotoxicological information

Short-term toxicity to fish

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Description of key information

The 96 hour LC50 is 15.7 mg/L. The estimated LC50 value from TLM QSAR is 6.712 mg/L.

The experimental value was used for the chemical safety assessment.

Key value for chemical safety assessment

Fresh water fish

Fresh water fish
Dose descriptor:
96 hour LC50
Effect concentration:
15.7 mg/L

Additional information

An Environmental Agency Japan test following OECD guideline 203, using semi-static conditions without analytical confirmation of exposure concentrations showed the 96-hour LC50 to be 4.3 mg/L. This study was unavailable for review but was included in the OECD SIDS for DCPD.

Bentley et al (1976) tested the toxicity of dicyclopentadiene to four species of fish. The range of LC50 values reported within the paper was between 15.7 -31.1 mg/L. The study followed a method similar to standard guidelines but did not include analytical confirmation of the exposure concentrations.

A QSAR result has also been included as part of the weight of evidence, which used the ECOSAR program to derive a 96-hour LC50 of 9.8 mg/L and Target Lipid modelling to derive an estimated LL50 for this substance is 6.712 mg/L.

The lowest of the measured results which are considered to be reliable has been conservatively selected as the key value for this endpoint.

The 96-hour LC50 for freshwater fish is 15.7 mg/L (Bentley et al 1976).