RAS Aquaculture Salmon Welfare Advances

Recirculating aquaculture systems for salmon production offer welfare and environmental benefits over sea cage systems, but require sophisticated management to realise their potential.

Key Facts

RAS salmon farming eliminates sea lice transmission to wild salmon populations, a major welfare and conservation benefit
Water temperature in RAS can be precisely controlled, reducing thermal stress across the production cycle
Stocking densities in RAS can exceed those in sea cages if water quality management is inadequate
Several large RAS salmon facilities have experienced catastrophic failures with mass mortality events
RAS requires approximately 95% less land and water than conventional salmon farming and eliminates marine escapes

Welfare Considerations

RAS salmon production represents a significant structural welfare improvement over open sea cage systems by eliminating sea lice, enabling precise environmental control, and removing exposure to wild predators and extreme weather. However, welfare outcomes in RAS depend entirely on the technical and operational competence of facility management. Equipment failures can cause rapid oxygen depletion or toxic ammonia accumulation that kills entire stock populations within hours. Optimising RAS for welfare requires investment in redundant monitoring systems, operator training, and density management that prioritises animal welfare alongside production efficiency.

What You Can Do

Choose RAS-produced salmon from facilities with transparent welfare and water quality monitoring data
Support welfare certification standards specific to RAS salmon production
Advocate for welfare outcome monitoring to be required as a condition of RAS aquaculture planning approval
Follow developments in RAS technology and welfare research from aquaculture welfare organisations
Engage retailers about the welfare and environmental credentials of their RAS salmon suppliers