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Fig. 1. Plasma cortisol levels in fish injected with either saline (control, N=8; filled squares), metyrapone (N=8; open circles) prior to exercise or cortisol (N=8; filled triangles) after a 5 min period of exercise (indicated by rectangular bar). R, the pre-exercise, post-injection value. Values are means ± 1 S.E.M.. *Significant difference (P<0.05) from the pre-exercise value; {dagger}significant difference (P<0.05) from the corresponding control value.