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Figure 11


Fig. 11. Sequential two-dimensional schematic drawings (not to scale) summarizing the formation of a near-fin wake and the evolution of caudal fin-wave propagation (CFP) jets observable in a forward-sinking fish executing a CFP. These drawings pertain to observations made from behind the fish. (A–D) Flow patterns observed at approximately the 1/3, 1/2, 4/5 and end phases, respectively, of a CFP beat cycle. The black bold lines represent the trailing edge of the caudal fin; the black filled circle represents the dorsal tip. The colored arrows indicate CFP jets (designated Jet 1, Jet 2 and Jet 3) generated by the caudal fin. The dashed circles with arrows represent vortices (denoted a–g) adjacent to the CFP jet. The temporal order of formation is Jet 1, Jet 2 and then Jet 3.





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