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A gas-filled sac in the upper part of the body cavity of many bony fishes. It is located just beneath the vertebral column; its principal function is to offset the weight of the heavier tissue such as bone.
- Browse Related Terms: air bladder, BAR, Benthic, broodfish, freshwater, Hypothermia, Lateral line, mesotrophic, Oligotrophic, Stocked, stream, swim bladder, Wild fish