An exemplary embodiment of an aquaculture cage of the invention has a buoyantstructure configured to float on awater surface, an aquaculture net portion made of a material that iscorrodible by salt water and attached to the buoyant structurefor positioning a top of the aquaculture net portion at a distance below thewater surface, where the aquaculture net portionencloses an interior of the cage from the top of the aquaculture net portionto a bottom of the aquaculture net portion to retain marinelife, and an upper enclosure portion enclosing space above the aquaculture netportion for preventing the marine life fromescaping over the top of the aquaculture net portion, where the upperenclosure portion comprises a material that is substantiallynon-corrodible by salt water.
