Abstract: A toy fish drive causes one or more toy fish to swim in a natural fashion in a transparent aquarium (viewing tank). A magnetic drive is connected to the external side of the wall or bottom portion of the aquarium and is supported from the side. The drive has two opposite sets of magnets which are rotated to exert magnetic drive forces on a swimming toy fish in the tank, the toy fish containing a magnet and swimming at a selected sinking rate. By means of the attracting force of the magnet in the toy fish, and the action of the magnetic drive forces of the rotating magnets, multiple toy fish are made to swim separately and in different directions simultaneously.

Abstract: A marine display device include a liquid vessel containing one or more toy fish, each fish containing an air chamber to impart buoyancy to the fish and a magnetic member. A pair of spaced apart chambers project upwardly from the base of the vessel, and a rotatable magnetic field-producing member is disposed in each of said chambers, and is operatively connected to a rotatable shaft which is rotatably driven by a motor.

Abstract: A method is provided for making a magnetic toy fish. The method comprises conformally joining two premolded plastic half-shell sections containing a magnetic member and a counterweight, and applying sonar energy across the joints to permanently join the half-shell sections together and form the fish.

Abstract: A toy including a movable model, components for generating and alternating a magnetic field in response to a direct current, a permanent magnet disposed in the generated magnetic field, and a component for transmitting movement of the permanent magnet in the generated magnetic field to the movable model.