Excess total gas pressure — especially nitrogen (N₂) — can cause gas bubble disease (GBD). Risk is highest with supersaturated source water, incorrect pumping under pressure or rapid heating of water with dissolved gas.
Practical measures
- Degas source water before it reaches the fish.
- Avoid sucking air into lines under vacuum.
- Monitor total gas pressure where the risk is known.
- Link CO₂ control to the oxygen strategy — both are gas balance.
See also dissolved oxygen, CO₂ and degassing in the RAS/flow-through sections.
See also