Tilapia is one of the most widely farmed fish globally, often raised in crowded, low-quality water conditions. Improving tilapia welfare through better stocking density and water management is feasible and increasingly demanded.
Tilapia welfare is frequently neglected because they are perceived as tough, low-sensitivity fish. While tilapia tolerate a wider range of conditions than salmon, this does not mean crowded conditions are welfare-neutral. High stocking densities cause social aggression, fin damage, and chronic stress. Water quality degradation in recirculating systems causes gill damage and behavioral abnormality. Fish welfare assessments for tilapia should use behavioral indicators including aggregation patterns, escape responses, and fin condition as proxies for welfare state. Welfare improvements in tilapia farming are low-cost relative to other species and should be prioritized given the scale of production.