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Fig. 4. Comparison of maximum power output as output pressure was raised in rainbow trout in situ perfused hearts from rainbow trout that had been screened as good or poor swimmers 9 months earlier. Both swim group and output pressure are significant determinants of power output (ANOVA; P<0.05) and no interaction between the factors was found. {dagger}Pairwise multiple comparisons confirmed the significant difference between good (blue) and poor (red) swimmers at the highest output pressure (9 kPa) as well as the significant drop in power output between 8 and 9 kPa in the poor swimmer group. Values are means ± S.E.M., N=8 good swimmers; N=7 poor swimmers.