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South American electric knifefish are a leading model system within neurobiology. Recent efforts have focused on understanding how they move, and how that relates to how their brain controls movement. Knifefish swim by means of an undulatory fin that runs most of the length of their body, affixed to the belly. Using this fin enables the fish to stay relatively straightforward, making them different from sharks in this regard. The results of this experiment show that there is an optimal operational region in the fin's kinematic parameter space, when the fin is used in conjunction with a robot.