Welfare considerations in the emerging Atlantic cod aquaculture industry, including the species' specific behavioral needs, domestication challenges, and production system welfare issues.
Atlantic cod aquaculture presents a unique intersection of conservation imperative and welfare challenge. The collapse of wild cod populations created strong motivation to develop farmed alternatives to relieve pressure on recovering wild stocks — yet the welfare science for captive cod is substantially less developed than for salmon, meaning that welfare problems are being encountered and addressed reactively rather than proactively. Cod are behaviorally complex predatory fish: their natural cannibalistic tendencies require constant size-graded grouping to prevent larger fish killing smaller ones — a repeated, highly stressful procedure. Their sea lice management creates different problems from salmon: cod remove parasites by rubbing on nets, causing fin erosion and secondary infection. High-density culture disrupts spawning behavior that involves coordinated group courtship. The welfare case for cod aquaculture rests partly on whether it can relieve pressure on wild populations — a conservation benefit — but this benefit only justifies the enterprise if welfare standards within the industry are adequate. Currently, they are not yet well enough defined or enforced to make this case confidently.