Tilapia is the world's most widely farmed fish, with over 6 million metric tons produced annually, making the welfare conditions of farmed tilapia a major global animal welfare issue.
Tilapia welfare suffers primarily from the species' tolerance of degraded conditions being used as justification for intensification. While tilapia can survive in poor water quality, they exhibit clear stress responses and reduced welfare indicators under such conditions. High stocking densities increase aggression and injury, particularly fin-nipping. Crowding during harvest causes severe hypoxia and physical trauma. Hormonal sex reversal of fry raises concerns about developmental welfare. Research on fish sentience increasingly supports that tilapia, like other teleost fish, have the neurological capacity for pain experience. The sheer scale of tilapia production — billions of individuals annually — makes welfare improvements in this sector extremely high-impact.