Tilapia is the second most farmed fish globally, yet welfare standards for tilapia production are nearly nonexistent. Crowding, water quality, and slaughter methods require urgent attention as production scales.
Tilapia's tolerance for crowding and poor water quality has been exploited commercially to justify extremely intensive production conditions. The welfare argument that 'they can survive it' is meaningfully different from 'they do not suffer in it.' Evidence suggests tilapia experience stress responses including elevated cortisol at high densities, show avoidance of painful stimuli, and express behavioral changes indicating negative welfare states. The species' resilience has paradoxically made it the subject of welfare neglect because production continues even when conditions are poor. Tilapia are killed primarily by asphyxiation, a method now recognized as inhumane for fish, without any stunning. The global scale of tilapia production means even small improvements in welfare standards would benefit enormous numbers of individuals.