12/09/2021
What is its purpose? The swim bladder, also called the air bladder, is a buoyancy organ possessed by the perch as well as most bony fish. The swim bladder is located in the body cavity and is derived from an out-pocketing of the digestive tube. It contains gas (usually oxygen) and functions as a hydrostatic, or ballast, organ, enabling the fish to maintain its depth without floating upward or sinking.
