Robotic fish uses three servos to swim

Robotic fish uses three servos to swim
  Amnon built this robotic fish. The three servos along with some distance sensors for obstacle avoidance are all controlled by a PIC 16F877A microcontroller. [Amnon] tried out three different waterproofing methods; coating the device in varnish, dipping it in hot glue, and dipping it in epoxy. The first two resulted in water damage to the ...

CAD designed Fish Robot Model

CAD designed Fish Robot Model
This is a nice fish robot that swims. The model fish robot, PPF-09 has two joints (has three servos). It swims and turns with vibrations of a tail peduncle and tail fin. Also it can dive in the water with movement of the fins, which are located at the side of a head. They say the robot is fairly ...