Robot fish swims by doing the wave Summary: Researchers at the University of Bath in the United Kingdom have developed a robot fish called Gymnobot that swims by rippling a fin on its belly. They say it may lead to lighter, more efficient robotic submersibles. September 29, 2009 -- 13:18 GMT (06:18 PDT) Loading... Please wait. Topic: Emerging Tech Kick off your day with ZDNet's daily email newsletter. It's the freshest tech news and opinion, served hot. Get it.