Tilapia are among the most farmed fish globally, with production exceeding 6 million tonnes annually. Their welfare in aquaculture systems is influenced by specific biological needs that commercial production often inadequately addresses.
Tilapia welfare illustrates how a species' physiological resilience can become an argument against welfare improvement. Because tilapia survive — though do not thrive — in poor water quality and high densities, these conditions have become normalized in commercial production. But survival is not welfare. Chronic stress from overcrowding, territorial frustration, and poor water quality causes measurable physiological responses indicating suffering even when fish do not die immediately. The hormonal sex reversal used to produce all-male populations, while common, has received almost no welfare assessment. As tilapia production expands to meet global protein demand, establishing welfare standards that go beyond minimum survival thresholds is increasingly urgent.