A rudder is a feature of submarine, ship, boat and aircraft. This is used for deflecting the water or air currents. In water it strikes the water with increased force on one side of the vehicle, to decrease the force on other side. It helps in the navigation process and facilitates the movement of the vehicle. The rudder helps in moving in the direction of low pressure.
In fish the rudder is the tail of the fish. The fish tail helps in deflecting the water currents that helps in movement of fish ahead.
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Fish tail
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The fish tail mountain is found in___________: brainly.in/question/1170030