Figure 4.

Mean oxygen consumption at baseline and post Ucrit (critical swimming speed) for King’s Creek (KC) and Atlantic Wood (AW) killifish. Mean oxygen consumption (mg O²/g⁻¹/min⁻¹) ± standard error for killifish after acclimation (baseline) and after the Ucrit assay (post Ucrit). Letters represent significant differences in consumed oxygen relative to untreated King’s Creek killifish at baseline. Treatment caused significantly higher oxygen consumption at baseline for King’s Creek and Atlantic Wood killifish (p < 0.05). All exhausted killifish had significantly elevated oxygen consumption levels relative to King’s Creek at baseline, but no significant differences among populations or treatments.