Arctic Char Welfare in Cold-Water RAS Aquaculture

Key Facts

• Arctic char require water temperatures of 10-15C for optimal welfare and growth
• They are sensitive to crowding and perform best at lower stocking densities than Atlantic salmon
• RAS technology allows precise temperature control that is advantageous for cold-water species production
• Arctic char are long-lived in the wild (up to 40 years) — welfare considerations extend beyond immediate production
• Pre-slaughter stunning using percussive methods is standard practice in established Arctic char operations

Welfare Considerations

Arctic char welfare in RAS aquaculture benefits from the precise environmental control that closed systems provide. Their cold-water requirements are challenging in land-based production but manageable with appropriate refrigeration systems. Crowding sensitivity means lower stocking densities are required compared to Atlantic salmon, which has economic implications but welfare benefits. Their relatively shy, calm nature makes them less prone to aggression-related injuries than some salmonid species. Welfare monitoring should include behavioral indicators: feeding response, schooling coherence, and surface orientation as signs of thermal stress or disease.

What You Can Do

• Source Arctic char from RAS operations with documented temperature management and low stocking densities
• Support development of Arctic char-specific welfare standards in aquaculture certification schemes
• Choose certified Arctic char products from operations using pre-slaughter percussive stunning
• Advocate for cold-water species welfare requirements in aquaculture regulatory frameworks
• Support research into optimal social and environmental conditions for Arctic char wellbeing in captivity