Tilapia is among the most widely farmed fish globally, particularly in developing countries. Welfare considerations including density, disease and slaughter are receiving growing attention.
Tilapia welfare is under-researched relative to the scale of production. Their relative hardiness compared to salmonids has led to assumptions that their welfare needs are minimal — an assumption increasingly challenged as fish sentience evidence grows. High-density production in ponds and cages causes crowding stress, increased disease pressure and reduced water quality. Social behaviour in tilapia means that dominant individuals in crowded conditions may prevent subordinates from accessing food and space. The low cost of tilapia — a protein source for low-income populations globally — creates particular challenges for welfare improvement since cost increases from welfare investment directly affect food security. Welfare improvement must be designed with these economic realities in mind.