Great news if your aquarium goes through fish faster than a fish n' chips restaurant. Takara Tomy has created these robotic alternatives that will swim around your tank in an incredibly lifelike fashion. But they never need to be fed, and more importantly, will never dirty the tank.

The robot fish run on a set of cell-sized watch batteries, but at just $19 a pop they might actually be cheaper to flush down the toilet when they die, instead of swapping in a new set. Now if only lifelike cyborg puppies were on the near horizon. [YouTube via Geekologie]