Aquaculture

Aquaculture RAS Recirculating Systems Welfare

Recirculating aquaculture systems (RAS) can improve fish welfare by controlling water quality and reducing disease, but also introduce unique welfare challenges.

Key Facts

RAS systems filter and recirculate water, allowing intensive production with minimal water use
Better water quality control reduces disease burden compared to flow-through systems
Fish in RAS face stocking densities that may cause crowding stress
Mechanical failures can cause rapid water quality deterioration
Land-based RAS removes sea cage exposure to parasites and pollution

Welfare Considerations

RAS systems offer potential welfare benefits through disease control and water quality management, but must be carefully operated. Equipment failures causing oxygen depletion can cause mass mortality within hours. High stocking densities in RAS require active management. When properly operated, RAS can provide good welfare outcomes for farmed fish.

What You Can Do

Support aquaculture welfare certification that covers RAS-specific parameters
Advocate for RAS stocking density and backup system requirements in regulation
Choose fish from RAS producers with transparent welfare monitoring