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Fig. 6. 24h median lethal concentrations (LC50) (+95% CI, N=4) for 3 and 7 days postfertilization zebrafish larvae exposed to phenoxyethanol in normoxic fresh water, normoxic 50% physiological saline and hyperoxic fresh water. Dashed lines indicate approximate median survival times (ET50) for suppression of ventilatory movements. The asterisk indicates a significant difference in median survival time compared with normoxic fresh water within an age class.