Please clarify

[fire]

fish have a gas-filled organ known as swim bladder that allows a fish to maintain buoyancy and balance in the water is it actualy gas or is it air im really confused by it. mostly i think air as i have read from deap sea fish but would really like to know for reall what it is.

[teag1rl]

Found this on wikipedia:
The combination of gases in the bladder varies; in shallow water fish, the ratios closely approximate that of the atmosphere, while deep sea fish tend to have higher percentages of oxygen. For instance, the eel Synaphobranchus has been observed to have 75.1% oxygen, 20.5% nitrogen, 3.1% carbon dioxide, and 0.4% argon in its gas bladder.
Link: http://en.wikipedia.org/wiki/Swim_bladder

[Gef]

Air is gas.

[Caladon]

In a lot of fish and aquatic mammals... it is an oil filled bladder.... hence why whales were culled in their thousands.