Tilapia is one of the most farmed fish species globally, yet welfare standards in tilapia aquaculture are almost entirely absent and poorly studied.
Tilapia's hardiness and low value have created a welfare vacuum. Because tilapia tolerate poor water conditions better than salmon, welfare problems are less economically visible — stressed tilapia may continue to survive and grow even in suboptimal conditions that cause chronic suffering. The assumption that hardiness equals welfare is false: an animal experiencing chronic stress from crowding, aggression, or hypoxia is suffering even if it survives. The welfare gaps in tilapia production are substantial across the production cycle — from the hormonal sex-reversal of fry, through high-density pond or cage culture, to slaughter without any form of stunning. As the welfare science literature for fish matures, tilapia as one of the most numerous farmed fish species deserves much greater attention.