Tilapia is one of the most widely farmed fish globally, with welfare standards that vary dramatically between intensive and extensive production systems.
Tilapia welfare in intensive aquaculture systems raises concerns similar to other intensively farmed fish species. Extreme stocking densities prevent normal territorial behavior in a species that in the wild establishes and defends territories. Hormonal sex reversal treatment - standard practice to produce all-male populations for better growth rates - raises welfare questions about the effects of hormone exposure on developing fish. Disease transmission at high densities mirrors the problems seen in salmon and shrimp farming. Water quality deterioration at extreme stocking densities reduces oxygen availability and increases ammonia, causing physiological stress. Compared to wild-caught fish from overexploited stocks, well-managed tilapia aquaculture can be more sustainable, but welfare standards vary enormously and the industry lacks strong welfare regulation.