Now, thanks to the prototype, “Fish on Wheels,” your pet fish can steer its own remote controlled car. Whichever way the fish moves, the vehicle moves. It uses a webcam to track the fish’s movement, a battery-powered Beagleboard and an Arduino controlled robot vehicle. Check out a cool video of “Fish on Wheels” in action here: http://www.gmanetwork.com/news/story/348348/scitech/science/this-aquarium-lets-your-goldfish-boldly-go-where-no-guppy-has-gone-before
Check out how to do more fun Arduino projects with a free chapter of "Programming Arduino Next Steps: Going Further With Sketches,"here: http://mhprofessional.com/product.php?isbn=0071830251.