The internal gas-filled organ in fish that allows them to control their buoyancy and stay at a specific water depth; can also be used to produce sound or aid breathing

glue made from fish air bladders or pig skin, used for sticking wood or leather together and for clarifying beer

gas-filled internal organ that helps a fish control its buoyancy

gas-filled organ in many bony fish used to control buoyancy

fish glue or gelatin prepared from the dried swim bladders of fish