Aquatica Waterworlds Screen Saver - Version 3.53 Aquarium 3D Fish Screen Saver. Experience the unique underwater worlds of Aquatica. The Aquatica Waterworlds screen saver has realistic 3D fish that randomly swim in multi-dimensional scenery. On-screen Internet messages allow you to display messages when the screen saver is active. New fish, Talking fish, 3D scenery and sounds for the screen saver are updated regularly.