Fish handling introduces rapid changes in pressure and water conditions. This increases the risk of gas-related stress and disease.
What is gas bubble disease
Gas bubble disease occurs when dissolved gases come out of solution inside the fish.
This happens when water is supersaturated, typically when TGP exceeds 100%.
Gas forms bubbles in tissue and blood, affecting gills, skin and internal organs.
Why handling increases risk
During transport and pumping, fish are exposed to:
- pressure changes between suction and discharge
- underpressure and overpressure in pipes
- rapid movement through different system conditions
Even small pressure changes can significantly affect gas balance.
Fish may compensate by changing depth, but this is not reliable in controlled systems.
Critical factors in handling
Risk is influenced by:
- transport distance and speed
- pipe design and diameter
- water velocity and filling degree
- oxygen demand and fish density
Handling always introduces biological and mechanical stress.
Operational reality
Fish are biologically sensitive. Gills and skin are directly exposed to the environment.
Damage or stress during handling can lead to reduced welfare, increased mortality and long-term effects.
Key takeaway
Safe handling depends on controlling both mechanics and water conditions, especially pressure and gas levels.