Low levels of salt in the water aid in the osmotic balance of the fish by making the water salinity closer to the fish's blood salinity. That helps the fish get rid of excess water accumulating in the body, causing the dropsy.

Can a fish recover from dropsy?

Dropsy is not easily cured. Treatment is geared toward correcting the underlying problem and providing supportive care to the sick fish. A broad spectrum antibiotic specifically formulated for gram-negative bacteria is recommended, like Mardel Maracyn® 2. Always follow directions for duration and dosage.

Why did my fish get dropsy?

Dropsy is a condition in fish caused by the buildup of fluid inside the body cavity or tissues. As a symptom rather than a disease in its own right, it can indicate a number of underlying diseases, including bacterial infections, parasitic infections, or liver dysfunction.