swim bladder = gas bladder (a thin membranous, sometimes alveolated sac in the dorsal portion of the abdominal cavity. Contains a varying mixture of gases, not identical to the composition of air. May be one, two or three chambered. May be connected to the gut by a tube, the ductus pneumaticus (then called physostomous) or unconnected (then called physoclistous). May function as one or more of:- hydrostatic organ, sound producing organ, sound receptor, respiratory organ. Found in Actinopterygii. Often lacking in bottom fishes. Sometimes called air bladder, a less appropriate term).
swim bladder disease = changes in pressure or temperature in tropical fishes that affects that internal organ responsible for maintaining equilibrium; the fish may rest on the bottom or float on the surface.
swim bladder infection = an acute haemorrhagic viral infection with a rhabdovirus. Symptoms include loss of coordination and equilibrium, popeyes, swollen belly, inflamed and swollen vent, and oedema and haemorrhages of various organs, particularly the swim bladder.