Japanese engineers have created a robotic Koi capable of swimming much like a real fish.
The 80cm/32" robot was developed by Ryomei Giken, a subsidiary of Mitsubishi Heavy Industries Ltd, in conjunction with two other companies in Hiroshima, western Japan.
The robotic Koi weighs about 12kg/26 lbs and can dive by shifting a weight inside its head.
Watch footage of the robocarp.
It is equipped with five motors to twist its body and control individual joints and fins, making its movements relatively lifelike.
The robot also includes a built in camera and sensors to monitor water quality.
The fish, which cost around 30 million yen (147,000) to develop from a previous prototype, is the fifth lineage of robotic fish developed by Ryomei Giken. Previous examples have included sea bream, golden carp and a coelacanth.
RobocarpWhile the robotic carp is undoubtedly impressive, it is technically less sophisticated than the world's first autonomously controlled robotic fish which went on display at the London Aquarium in October 2005.
Developed by scientists from the University of Essex, the autonomously controlled robocarp are capable of navigating around their aquarium without bumping in to things and seem to move in a much more realistic manner.