Tilapia is one of the most widely farmed fish globally, and welfare concerns center on stocking densities, water quality management, and the stress of intensive production systems.
Tilapia are often described as robust, leading producers to push stocking densities beyond welfare-optimal levels. However, research shows that crowded tilapia display elevated cortisol, increased aggression, reduced immune function, and higher disease susceptibility. Water quality management — particularly dissolved oxygen and ammonia — is fundamental to tilapia welfare. Consumers choosing certified tilapia from responsibly managed farms exert market pressure for improved conditions. The growth of tilapia aquaculture presents both a major animal welfare challenge and an opportunity for industry-wide improvement.