<P> 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 . A fish with swim bladder disorder can float nose down tail up, or can float to the top or sink to the bottom of the aquarium . </P> <P> Fancy goldfish are among the fish most commonly affected by this disorder . The disease may be caused by intestinal parasites or by constipation induced by high nitrate levels from over feeding . </P> <P> A remedy, which can work within hours, perhaps by countering constipation, is to feed green pea to affected fish . Fish surgeons can also adjust the buoyancy of the fish by placing a stone in the swim bladder or performing a partial removal of the bladder . </P>

How do betta fish got swim bladder disease
find me the text answering this question