Abstract: An apparatus for the removal or inhibition of underwater growth on an elongate submerged body. It includes at least one collar adapted to extend loosely around the elongate submerged body (28). The collar includes a breaker device to apply impact force on the underwater growth to break it up. The breaker device includes a voluminous body (16) into which ambient water flows in and out. The device can advantageously include rollers (12). The apparatus on a smaller scale can act to inhibit the settlement of new underwater growth.

Abstract: An apparatus powered by waves, currents, or tides for eliminating or preventing marine growth on a structure. The apparatus includes (a) at least one ring adapted to surround a submerged support member of the structure, the at least one ring being substantially continuous; (b) at least one pair of rollers rotatable against a surface of the support member for cleaning the surface of the support member; and (c) a linking member for linking the roller means to the ring without interrupting continuity of the substantially continuous ring and for allowing rotation of the rollers against the surface of the support member in response to forces generated by the waves, currents or tides.