A fish-farming cage (1), the fish-farming cage (1) comprising a first buoyancy element (10) with a first diameter (DIO), a second buoyancy element (20) with a second diameter (D20), a third buoyancy element (30) with a third diameter (D30), a closed enclosure (40) comprising a bottom wall (41) and a top wall (42), and an anchoring (50). In a lowered position, the second buoyancy element (2) is vertically displaceable in a water column relative to the first buoyancy element (10) when the first buoyancy element (10) is positioned in a water surface (0), the first buoyancy element (10) including a first work platform (11) and the second buoyancy element including a second work platform (21).
