Fishman Jujutsu is another martial art that is practiced by the fishman race, seemingly alongside Fishman Karate. It is an underwater style that revolves around manipulating the water around them as if it were a tangible material. How the fishmen are able to do this is unknown, but it provides them with a massive advantage in underwater combat. So far, only Jimbei and Hody have been shown using it.
- Water Heart: The primary technique of this style that the user initiates by first performing a bowl-shaped gesture with his webbed hands (one hand over the other) while underwater right before giving the water itself around him a mighty yank. This allows the user to physically grab and redirect currents as if he were manipulating cloth.
- Ocean Current Shoulder Throw: After he uses Water Heart, Jimbei heaves the current upward, where it erupts from the ocean surface as a towering stream of water.
- Shark Pack: Hody throws the water which takes the shape of a flock of sharks which bite his opponent.