Swim bladder disease

When there is air in the bladder the ventral side can vary substantially in size depending on how much gas is present.

The disease may be caused by intestinal parasites or by constipation induced by high nitrate levels from over feeding.

This can be due to overeating, overconsumption, low water temperatures, bacterial infections, parasites, or other impaired organs affecting the bladder.

[5] In these particular cases, the fish can end up with a distended belly, curved back, impaired swimming, or even death leaving them floating on top of the water.

A remedy, which can work within hours,[citation needed] perhaps by countering constipation, is to feed green peas to affected fish.

[2] In order to prevent this disease, keep the tank as clean as possible, make sure the temperature is slightly higher than normal to aid in digestion, and, most importantly, feed the fish highly nutritious foods.