Abstract: A fish cage system, which includes a fish cage having one or more cables connected to it. The fish cage and cable(s) have a combined buoyancy which is such that at least a portion of the fish cage is normally located at or above the water surface. The cable(s) are connected to a sinker whose weight is sufficient to overcome the combined buoyancy of the fish cage cable(s). The sinker is also connected to a second cable which is connected to a buoy. The buoy contains a winch for alternately shortening and lengthening the effective length of the second cable so as to alternately allow said fish cage to float or to submerge.