Fig. 4. (A) Changes in plasma osmolality in control (black bars) and exercise-trained (grey bars) chinook salmon at 1 BL s^-1, at 80% U_crit, at U_crit, and after a 1 h recovery following U_crit. ^*Significant (P<0.01) difference compared with the rest value; significant (P<0.01) difference between control and exercise-trained fish. (B) Changes in plasma osmolality in control (black bars; 0.5 BL s^-1) and exercise-trained (grey bars; 1.5 BL s^-1) groups of chinook salmon at U_crit, and after a 1 h recovery following U_crit compared with rest. These fish were exercise-trained at a low intensity in a previous study (Thorarensen et al., 1993) and these new data are included to illustrate that both high intensity and low intensity training regimens can influence the ability of chinook salmon to osmoregulate during activity. ^***Significant (P<0.001) difference compared with the rest values; significant (P<0.001) difference between control (N=6-10) and exercise-trained fish (N=6-9).

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