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Effects of removal of the opercula on the survival rate and oxygen consumption rate. The opercula were cut along the blue dashed line, and the schema of opercula-removed zebrafish is shown (a). The survival rate (N = 50) (b) and oxygen consumption rate (N = 10–11) (c) were recorded after the opercula were removed. Values are the mean ± SD. Student’s t-test. ns = not significant. WT = wild type. RO = removal of the opercula.
