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The swim bladder, gas bladder, fish maw, or air bladder is an internal gas-filled organ in bony fish (but not cartilaginous fish [1]) that functions to modulate buoyancy, and thus allowing the fish to stay at desired water depth without having to maintain lift via swimming, which expends more energy. [2]
Swim bladder disease, also called swim bladder disorder or flipover, is a common ailment in aquarium fish. The swim bladder is an internal gas-filled organ that contributes to the ability of a fish to control its buoyancy , and thus to stay at the current water depth without having to waste energy in swimming. [ 1 ]
These sonic muscle fibres are repeatedly contracted against the swim bladder to produce the croaking sound that gives drum and croaker their common name, effectively using the swim bladder as a resonating chamber. The sciaenids' large swim bladder is more expansive and branched than other species, which aids in the croaking. [18]
Spring viraemia of carp, also known as swim bladder inflammation, is caused by Carp sprivivirus, also called Rhabdovirus carpio. It is listed as a notifiable disease under the World Organisation for Animal Health .
Another threat to the totoaba is from human poaching: the swim bladder, commonly referred to as "maw" is a valuable commodity, as it is considered a delicacy in Chinese cuisine; [20] the meat is also sought-after for making soups. It can fetch high prices – 200 bladders may be sold for $3.6 million at 2013 prices – as it is erroneously ...
In ray-finned fish these have evolved into swim bladders, the changing sizes of which help to alter the body's specific density and buoyancy. In elpistostegalians , a crown group of lobe-finned fish that gave rise to the land-dwelling tetrapods , these respiratory diverticula became further specialized for obligated air breathing and evolved ...
The swim bladder is a more derived structure and used for buoyancy. [5] Except from the bichirs, which just like the lungs of lobe-finned fish have retained the ancestral condition of ventral budding from the foregut, the swim bladder in ray-finned fishes derives from a dorsal bud above the foregut.
Barotrauma injury to tiger angelfish – head end. Note distended swim bladder (centre) and gas space in abdominal cavity (left) Barotrauma injury to tiger angelfish – tail end. Fish with isolated swim bladders are susceptible to barotrauma of ascent when brought to the surface by fishing. The swim bladder is an organ of buoyancy control ...