The Black Ghost knifefish is an elongated freshwater fish that swims around by unudlating it’s long anal fin, much in the same way that some eels and brotulas do. Researchers from Northwestern University studying the motion of Black Ghost knifefish decided to build a robot model of the unusual fish. Ghostbot accurately reproduces the undulating motion of Ghost Knifefish and it has allowed the scientists to discover a jetstream motion of water that develops right underneath the fish as the undulations meet each other on the underside of the fish. Of all the fish to roboticize, we would have placed the Black Ghost Knife at the bottom of the list but the result is undeniable cool. Full video when you click on the header image.