RoboCarp

No it's not Jaws, but a robotic fish that Japanese developers tested in Hiroshima a few weeks ago.

Based on a Koi Carp, as a form of tribute to Hiroshima castle, (Ki-Jo means Carp Castle), the electronic fish is 31 inches long and 26 pounds in weight. It was developed by Ryomei Giken, a subsidiary company of Mitsubishi Heavy Industry Ltd and two other Hiroshima based companies.

The carp can also dive by shifting a weight inside it's head and is fitted with a camera and underwater sensors.

However the carp cost 30 million yen or 147,000 pounds to develop so it's a bit of an expensive birthday present.

NHK Video link below (apologies for poor quality)
http://www.youtube.com/watch?v=M7YGEVuJ4mM