SereneScreen Marine Aquarium for Mac

This screensaver turns your Mac OS desktop into a virtual aquarium. You can choose from several different kinds of tropical fish that swim in full 3D around the desktop of your Mac. These fish are actual 3D models, not flat images dragged accross the screen. There are also lighting effects to simulate the sun as it passes through the tank, a realistic-looking starfish that very slowly moves around the tank, and an air pump to produce realistic-looking bubbles if your graphics card can support it. Version 2.0 features a new user interface and five new fish.