Definitions for gas bladder  This page provides all possible
meanings and translations of the word gas bladder     1. gas
bladder(Noun)      An internal organ that fish use to control
their buoyancy, allowing them to maintain or change depth by
changing their density.     1. Swim bladder      The swim
bladder, gas bladder, fish maw or air bladder is an internal
gas-filled organ that contributes to the ability of a fish to
control its buoyancy, and thus to stay at its current water
depth without having to waste energy in swimming. Also, the
dorsal position of the swim bladder means the center of mass is
below the center of volume, allowing it to act as a stabilizing
agent. Additionally, the swim bladder functions as a resonating
chamber, to produce or receive sound. The swim bladder is
evolutionarily homologous to the lungs. Charles Darwin remarked
upon this in On the Origin of Species. Swim bladders are found
in many bony fish, but are not found in cartilaginous fish. In
the embryonic stages some species, suc