Betta Swimming Sideways. Swim bladder disease can also cause a fish to become bloated and unable to eat. If a fish is swimming vertically or upside down, it is still likely due to one of the above issues.

It's definitely a problem with his swim bladder, but there are a lot of possible causes. In addition, the spine may look curved, and the belly area will look full or bloated. 43 votes) this disorder happens when the swim bladder of the fish is too full.

Why Is My Betta Fish Swimming Fast. By joshua edwards, 5 years ago on tropical fish. Often caused by a lack of oxygen in your betta’s water, hypoxia can cause your fish to swim in an odd way.

All betta fish are bony and have an organ named a ‘swim bladder’. Why is my betta fish floating on its side? When the swim bladder is damaged or otherwise compromised a betta will.