Fig. 4. Median survival times (+95 % CI) for 21 days postfertilization zebrafish prevented from ventilating their gills because of exposure to 150 mgl^-1 MS222 in normoxic fresh water, normoxic 50 % physiological saline, hyperoxic fresh water and hyperoxic 50 % physiological saline. Asterisks indicate significant differences in median survival times compared with normoxic fresh water. Numbers in parentheses indicate the number of trials.

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