The fish tail motion forms an attached leading edge vortex.

@article{Borazjani2013TheFT,
  title={The fish tail motion forms an attached leading edge vortex.},
  author={Iman Borazjani and Mohsen Daghooghi},
  journal={Proceedings. Biological sciences},
  year={2013},
  volume={280 1756},
  pages={20122071}
}
The tail (caudal fin) is one of the most prominent characteristics of fishes, and the analysis of the flow pattern it creates is fundamental to understanding how its motion generates locomotor forces. A mechanism that is known to greatly enhance locomotor forces in insect and bird flight is the leading edge vortex (LEV) reattachment, i.e. a vortex (separation bubble) that stays attached at the leading edge of a wing. However, this mechanism has not been reported in fish-like swimming probably… CONTINUE READING
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