Tilapia is one of the most commonly farmed fish globally, providing affordable protein for billions of people, but the welfare of tilapia in commercial aquaculture depends heavily on stocking density, water quality, and slaughter methods that vary enormously between producers.
Tilapia welfare is often overlooked because of the species' reputation for hardiness. However, hardiness does not equal insensitivity to poor conditions — it means tilapia survive in environments that would kill more sensitive species, while still experiencing chronic stress, injury, and disease. The high stocking densities common in cost-focused tilapia production cause persistent aggression, fin damage, and immunosuppression. Oxygen depletion events cause mass suffering and mortality. The welfare at slaughter is highly variable and often poor, with many tilapia killed without any form of stunning. As one of the most consumed fish species globally, even modest improvements in tilapia welfare standards would affect an enormous number of animals.