Japan has presented us with robotic cats, dogs and even humanoids and to the untrained eye they are as good as real. Bright minds from the University of Kitakyushu, Japan have developed 'Rarerurashii' a 7kg robotic fish which is the most realistic I have ever seen. It swims using a vibration wing propulsion system and uses the tail fin to swim through the water. When fully charged the fish can swim for about 1 hour 20 minutes. It is extremely quiet and thus one day will be used for under water biological exploration.

(More images and video after the jump)