Nile tilapia (Oreochromis niloticus) is the most important farmed fish in Sub-Saharan Africa, providing critical food security for millions. Traditional small-scale pond production raises welfare concerns about crowding, water quality, and management, while industrial tilapia farming introduces additional welfare challenges.
Tilapia in poorly managed ponds experience nocturnal oxygen depletion, crowding at surface waters to breathe, and elevated cortisol. Fish showing air-gulping behaviour are under acute respiratory stress. High ammonia from uneaten feed and waste causes gill damage and systemic toxicity. In cage systems, natural nest-building and territorial behaviours are suppressed, contributing to chronic frustration. Welfare improvements accessible to small-scale African producers include aeration during at-risk periods, reduced stocking density, and feed management to reduce organic loading. Market access for higher-welfare certified tilapia is limited in African markets, making welfare improvement primarily a farming practice and policy challenge.