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Fig. 3. Comparison of maximum cardiac performance of in situ perfused hearts from rainbow trout that had been screened as good or poor swimmers 9 months earlier. *A significant effect of increasing adrenaline (ADR) within a group; {dagger}significant difference (P<0.05) between two groups of fish under common conditions. Values are means ± S.E.M., N=8 good swimmers; N=7 poor swimmers.