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Short-term toxicity to fish

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Zebra fish were exposed to nominal chloroprene concentrations of 0 (control), 6.25, 12.5, 25, 50 and 100 mg/L for 96 hours under semi-static conditions according to EU Method C.1 Acute toxicity to fish (2008). A complete set of analysis of new and 24 hour aged media was performed for the nominal 100 mg/L treatment. Geometric mean values were calculated for each 24 hour exposure period. The highest geometric mean value, 5.25 mg/L, was obtained during the final 24 hour exposure period. No mortality was observed in any of the test concentrations, therefore, the 96 hr LC50 was observed to >5.25 mg/L. No sub-lethal effects were observed on any of the treated fish, therefore the no-observed effect concentration (NOEC) was observed to be 5.25 mg/L.

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