Abstract: The present invention discloses a system for preventing the growth of marine organisms on objects which are continually submerged in water, such as a boat hull or piling. The present invention operates by having a source of air deliver air through a conduit to an underwater aeration device placed in proximity to the object which is desired to be free of the marine organisms. The present invention comprises an underwater aeration framework having a plurality of air vents therein which supply air bubbles so as to constantly keep the water in motion around the boat hull, piling or other underwater structure, thereby preventing the growth of marine flora and fauna.