Abstract: The preferred embodiment of the present invention teaches an open water mariculture facility wherein there is provided a central platform/support structure from which uniformly emanates a plurality of elongated, generally cylindrically configured, ballastable cage structures for containing and maintaining a marine species. The present system contemplates ballastable cages, which can be raised for maintenance operations. In one maintenance operation, the cages are partially exposed out of the water for the maintenance of the cage walls; the system further provides a rolling system for turning the cages on demand, for out of the water maintenance of all portions of the cage wall, without the necessity of lifting the cages from the water. An alternative system of the present invention contemplates the conversion of abandoned oil platforms for use as the central platform/support structure, providing a central support structure for an array of cages.