Specifically,
fish consistently preferred to follow the Gray robot rather than its red replica, spending a
larger amount of time in the focal region behind the
robotic fish (from the Top view) and in the middle of the water column (from the Side view).
While findings in [20] have contributed to validating the hypothesis that the hydrodynamic return offered by a
robotic fish is a determinant for
robotic fish's attractiveness to live
fish, the robot used therein was considerably
larger than live
fish.