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Figure 10


Fig. 10. Trout yawing maneuver at 0.5 L s–1. The fish is maneuvering away from the top of each image. The dorsal view is taken while the dorsal fin pauses at maximum excursion, showing a large shear layer along the left side of the fin and the formation of a strong lateral jet. The ventral view is taken just after the anal fin begins to return from maximum excursion; again a large shear layer is seen on the left side of the fin also accompanied by a large lateral jet. During yawing maneuvers, contralateral jet formation is typically weak, causing an imbalance in force production and moving the fish's body laterally away from the strong jet side of the fish. Shadows where vectors were not calculated represent regions where the laser light sheet was blocked by the fish body or fins (after Standen and Lauder, 2007).





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