Undulations of the tail and dorsal fins of the African freshwater electric eel allow for smooth bidirectional movement through the water.

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“In addition to forward undulatory swimming, Gymnarchus niloticus can swim via undulations of the dorsal fin while the body axis remains straight; furthermore, it swims forward and backward in a similar way, which indicates that the undulation of the dorsal fin can simultaneously provide bidirectional propulsive and maneuvering forces with the help of the tail fin.” (Li et al. 2005:115)

Journal article
Locomotion of Gymnarchus niloticus : Experiment and kinematicsFei Li, Tian-jiang, H; Fei, L; Guang-ming, W; Lin-cheng, S.

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