Aquaculture

Aquaculture RAS Systems and Welfare

Recirculating aquaculture systems (RAS) offer environmental advantages over open net pens but create specific welfare challenges that require careful management.

Key Facts

RAS systems recirculate 95-99% of water, dramatically reducing environmental footprint compared to net pens
Gas supersaturation in RAS can cause bubble disease in fish, a painful condition affecting gas exchange
Water quality parameters in RAS must be actively managed to prevent ammonia and CO2 accumulation
RAS systems eliminate sea lice but introduce new welfare challenges from high density and handling

Welfare Considerations

RAS aquaculture represents environmental progress but does not automatically improve fish welfare. Intensive recirculating systems create fish welfare challenges through high density, handling stress, water quality management demands, and disease risks specific to closed systems. Welfare-optimized RAS design includes appropriate density limits, reliable water quality monitoring, and emergency protocols for system failures.

What You Can Do

Support RAS aquaculture that explicitly addresses fish welfare alongside environmental performance
Ask seafood suppliers about the welfare management protocols in their RAS facilities
Advocate for welfare standards specifically designed for RAS aquaculture systems
Support research into optimal stocking densities and environmental parameters for RAS fish welfare