A fish pen for aquaculture comprising: an elongate center spar buoy having an upper spar portion and a lower spar portion; a reserve buoyancy buoy attached to a top end of the center spar buoy; a lower connection plate attached to the lower spar portion; an upper connection plate adjustably attached to the upper spar portion; a lower rim having a plurality of flange members; an upper rim having a plurality of flange members; a plurality of first tension members having a first end attached to the lower connection plate and a second end attached to a corresponding one of the lower rim flange members; a plurality of second tension members having a first end attached to one of the plurality of lower rim flange members and a second end attached to a corresponding one of the upper rim flange members; a plurality of third tension members having a first end attached to one of the upper rim flange members and a second end attached to the upper connection plate; a netting assembly defining an enclosed volume and comprising (i) a floor portion attached to the lower rim and the center spar buoy, (ii) a wall portion extending up from the floor portion, and (iii) an upper portion extending inwardly from the wall portion and attached to the upper rim and the center spar buoy, a first interior panel having a lower edge adjacent the floor portion, an inner edge engaging the center spar buoy, and an outer edge adjacent the netting assembly wall portion, a second interior panel having a lower edge adjacent the floor portion, an inner edge engaging the center spar buoy, and an outer edge adjacent the netting assembly wall portion, wherein the first and second interior panels (180,182) are configured to define a smaller operable volume within the netting assembly, and a docking station comprising an upright fender member that is attached to the upper rim. an elongate center spar buoy having an upper spar portion and a lower spar portion; a reserve buoyancy buoy attached to a top end of the center spar buoy; a lower connection plate attached to the lower spar portion; an upper connection plate adjustably attached to the upper spar portion; a lower rim having a plurality of flange members; an upper rim having a plurality of flange members; a plurality of first tension members having a first end attached to the lower connection plate and a second end attached to a corresponding one of the lower rim flange members; a plurality of second tension members having a first end attached to one of the plurality of lower rim flange members and a second end attached to a corresponding one of the upper rim flange members; a plurality of third tension members having a first end attached to one of the upper rim flange members and a second end attached to the upper connection plate; a netting assembly defining an enclosed volume and comprising (i) a floor portion attached to the lower rim and the center spar buoy, (ii) a wall portion extending up from the floor portion, and (iii) an upper portion extending inwardly from the wall portion and attached to the upper rim and the center spar buoy, (i) a floor portion attached to the lower rim and the center spar buoy, (ii) a wall portion extending up from the floor portion, and (iii) an upper portion extending inwardly from the wall portion and attached to the upper rim and the center spar buoy, a first interior panel having a lower edge adjacent the floor portion, an inner edge engaging the center spar buoy, and an outer edge adjacent the netting assembly wall portion, a second interior panel having a lower edge adjacent the floor portion, an inner edge engaging the center spar buoy, and an outer edge adjacent the netting assembly wall portion, wherein the first and second interior panels (180,182) are configured to define a smaller operable volume within the netting assembly, and a docking station comprising an upright fender member that is attached to the upper rim.