1)   Aquatica Azure Screen Saver 1.10.28
Aquatic 3D Fish Screen Saver, 3D Background Editor with underwater objects. Selectable features including 85 3D fish, 3D fish editor,5 backgrounds, scenery maker random music and sounds.

 2)   3D Fish School Screensaver 4.0
Turn your computer desktop into an incredible 3D underwater world. Watch schools of near-realistic quality 3D fish swim among bubbles within beautiful underwater backgrounds.

 3)   Aquatica 3D 2.17
Aquarium 3D Fish Screen Saver, 3D Scenery Maker with 10,000 underwater objects. Selectable features including 85 3D talking fish, 3D fish creator, 700 backgrounds, scenery makerrandom music and sounds, updated every month. Display on-screen messages.

 4)   Fish Tank Screensaver 1.0
The water depth keeps the mysteries which will be opened to you thanks to unique photos from the very deep parts of the ocean. But be careful visiting a shark's dwelling, do not become its dinner.