It's an Air Sac.
Swim bladder
The eye is an organ in any animal, parrot fish included.
Fish breathe through gills these are their lungs.
The gills.
gill
garage
Streamlined Bodies
yes
none
The majority of bony fish has swim bladder that keeps them buoyant. The organ is also called gas bladder, fish maw, or air sac.
Most boney fish have a urinary bladder.
The swim bladder is the organ that keeps the fish balanced and upright, is an internal gas-filled organ that contributes to the ability of a fish to control its buoyancy. It is also known as the gas bladder, fish maw or air bladder.