We often worry if robots will replace us and take over our jobs in the future, but what about marine life? Perhaps they’re in danger of being replaced with robots too, and the electric fish by Sedensha Co. probably isn’t easing the nerves of fishes out there. This little robotic fish’s movements are controlled through electrostatic actuators which replicate the movements of fish muscles. The components are housed within a silicon rubber fish, filled with silicone oil, which probably isn’t the kind of oil you’d supplement your diet with. Check out a video of this robotic fish in action after the jump.