Crowding is one of the most pervasive welfare problems in salmon farming, driving chronic stress, aggression, and disease — but innovative alternatives to high-density production are emerging.
Crowding stress is perhaps the single greatest welfare issue in industrial salmon farming. The physical and psychological costs of living at high density — chronic stress, suppressed immunity, fin damage, eye injuries, and reduced feeding opportunities for subordinate fish — affect every salmon in commercial production. While economic pressures drive density increases, there is growing evidence that lower-density production is compatible with commercial viability when combined with better feed conversion and premium pricing. Structural enrichment can partially mitigate crowding effects at existing densities. Consumer and retailer pressure for welfare-certified salmon with specified maximum densities is one of the most effective levers available for driving improvement across the sector.