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Fig. 1. Experimental setup. (A) The routine swimming of zebrafish was recorded from
a dorsal perspective with high-speed video. High-contrast video images were
generated by illuminating the translucent floor of the aquarium with a
fluorescent light, which was prevented from heating the floor of the tank by
the use of a computer fan. (B) Drag was measured by tethering dead fish from
the ventral surface and exposing the body to flow (see text for details).