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Figure 9


Fig. 9. Downstream position of the head every 5 s for 1 h for an individual trout, illustrating the role of the lateral line in facilitating exploration of the flow tank. (A; gray fill) In the dark, a fish with an intact lateral line alternately entrains between right and left sides of a cylinder. (B; gray fill with red box) When the lateral line is blocked, the same fish will continue to entrain in the suction region but no longer explores the other side of the cylinder. In the dark, fish do not prefer to Kármán gait in the vortex street.





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