Shrimp Welfare in Recirculating Aquaculture Systems

Recirculating aquaculture systems for shrimp offer better environmental control than ponds. Understanding welfare implications of RAS shrimp production guides best practice.

Key Facts

Shrimp RAS allows year-round indoor production in any climate
Precise water quality control in RAS reduces chronic oxygen and ammonia stress
However, high stocking densities in RAS can exceed natural behaviour thresholds
Shrimp in RAS are more uniformly exposed to system-wide pathogens when infections occur
Moulting periods create vulnerability as soft-shelled animals are injured by conspecifics

Welfare Considerations

RAS shrimp production offers potential welfare advantages through better environmental control but introduces new challenges. Ultra-high stocking densities achievable in RAS expose shrimp to chronic crowding stress. The enclosed system means pathogen spread can be rapid and devastating. Moulting synchronisation in uniform temperature systems creates periods when many soft-shelled animals are simultaneously vulnerable to injury. Maintaining stocking densities below crowding stress thresholds and providing refuge structure during moulting periods improves welfare in RAS systems.

What You Can Do

Choose shrimp from RAS producers with documented stocking density limits
Ask retailers about shrimp RAS welfare standards in their supply chains
Support research into optimal stocking densities and enrichment for RAS shrimp
Advocate for welfare criteria in RAS aquaculture certification schemes