What body system is the swim bladder part of in a fish?

The swim bladder is part of the fish's buoyancy control system, allowing it to maintain its position in the water column without expending energy. It is a gas-filled organ that enables fish to adjust their buoyancy by regulating the amount of gas inside it. While it is not part of a traditional body system like the circulatory or respiratory systems, it interacts closely with these systems to help fish achieve neutral buoyancy.