Fig. 5. (A) Average, rectified area of muscle activity (product of muscle intensity and burst duration) along the body for all five trout swimming in uniform flow at 3.5 L s^–1 (light gray bars) and Kármán gaiting in a vortex street (dark gray bars). Vertical lines indicate S.E.M. Note that there is no white muscle activity (W5 and W6) during either flow treatment. Compared with trout behind a cylinder, axial muscles of trout swimming in uniform flow have a significantly greater average rectified area for all locations down the body except R1 (n=20). Kármán gait R1 muscle activity has a significantly lower intensity (B) but longer burst duration (C) than R1 muscle activity during swimming in uniform flow.