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About the Cover
Cover:
To draw prey into its mouth, a suction feeding fish generates a flow field external to its head. Day et al. (pp. 2661-2671) used particle image velocimetry to quantify the fluid velocity in this flow as a function of space and time and related this to the kinematics of the feeding fish. Here, the measured velocity field relative to the feeding bluegill Lepomis macrochirus is shown superimposed on a high-speed video image. While the affected fluid is always constrained to a region close to the mouth, the flow speed and the area of influence are controlled by modulating how quickly and how wide the mouth opens. Higham et al. (pp. 2653-2660) determined that bluegill can further manipulate the region from which fluid is drawn into the mouth by varying swim speed.
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