Aquaculture

Aquaculture: Recirculating Aquaculture Systems Welfare

Recirculating aquaculture systems (RAS) offer potential welfare advantages through controlled environments but introduce new welfare challenges from water quality management.

Key Facts

RAS systems reuse 90-99% of water through filtration and treatment
Water quality parameters can be optimised and monitored continuously in RAS
Disease pressure is lower in isolated RAS compared to flow-through or sea cages
High density stocking in RAS requires exceptional water quality management
System failures can cause rapid deterioration in welfare and mass mortality

Welfare Considerations

RAS offers genuine welfare advantages in disease control and environmental optimisation, but dependency on technical systems creates catastrophic risk. System failures causing oxygen depletion or toxic ammonia spikes result in rapid and severe welfare harm. Backup systems and monitoring are essential welfare provisions.

What You Can Do

Support RAS welfare certification that includes system failure protocols
Advocate for RAS welfare standards covering backup systems and monitoring
Choose RAS-produced fish from certified welfare-conscious producers
Support research into optimal stocking densities and environmental conditions in RAS