Robot fish can be just as convincing as the real thing

Researchers at NYU Polytechnic University have managed to trick live fish into following a robot around. Stefano Marras and Maurizio Porfiri built their fishy robot to mimic as closely as possible the behavior of the real things, particularly in the way the robot moves its tail.

Here’s how it works, according to the press release:

In nature, fish positioned at the front of a school beat their tails with greater frequency, creating a wake in which their followers gather. The followers display a notably slower frequency of tail movement, leading researchers to believe that the followers are enjoying a hydrodynamic advantage from the leaders’ efforts.

So the researchers put their robotic fish in the water with a bunch of fish called golden shiners to see how well they could imitate the leaders. When the robot stayed still, the fish didn’t care about it at all. But when they had the robot mimic that tail motion of the leader fish, other members of the school slowed down their tails and followed.

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