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The gas bladder, also known as a swim bladder or fish maw, is a hydrostatic organ found in finfish that enables them to regulate their buoyancy at different depths in water. By adjusting the volume of the bladder, the fish can control its buoyant force. When the fish reduces the bladder's volume, it decreases its overall body volume, reducing the lifting force and causing the fish to sink. Conversely, when the fish wishes to rise to the surface, it increases the bladder's volume, which increases the buoyant force acting on it, allowing the fish to ascend.