Fish Diseases and Management

6.3.1.10 Gas supersaturation

Gas supersaturation occurs when the total pressure of gases dissolved in water is higher than the ambient atmospheric pressure. Acute gas supersaturation can cause high mortalities within  few days of exposure. It causes hyperinflation of the swimbladder, cranial swelling, exophthalmos, etc. Low supersaturation levels cause extra vascular emboli in the gastro intestinal tract and mouth. Packed columns and passive degassers can be used to eliminate the excess gas in the water source.