Tilapia is one of the most farmed fish globally, with production concentrated in China, Indonesia, and Egypt. Meeting rising global demand while improving welfare across the production cycle is an important challenge.
Tilapia welfare has received less attention than salmon or trout welfare, partly because of their hardiness and lower perceived commercial value. However, research confirms they have pain-processing capacity and show behavioral and physiological stress responses. High stocking densities common in intensive tilapia production restrict natural social behaviors and increase aggressive interactions. Sex reversal through hormone treatment raises welfare questions about manipulation of reproductive biology at scale. Water quality, while tolerated at lower levels than other species, still affects welfare through oxygen availability, ammonia accumulation, and disease pressure. At slaughter, CO2 narcosis — the most common method — causes observable distress and extended time to insensibility. Electrical stunning and percussive stunning offer more humane alternatives that are increasingly available for tilapia-sized fish. The welfare improvement opportunity in tilapia is large given the scale of production.