Tilapia is the most widely farmed fish globally in tropical regions, and its welfare in intensive production systems is a growing area of research and advocacy with significant implications for millions of animals.
The welfare of farmed tilapia is often dismissed because of their reputation for hardiness, but ability to survive poor conditions does not mean indifference to them. Chronic social stress from hierarchy-related aggression, sub-optimal water quality causing respiratory effort, crowding before slaughter, and rapid temperature changes all represent welfare costs for fish with demonstrated stress physiology. The hormone treatment used to produce all-male fingerlings, while effective, raises ethical questions about routine pharmaceutical manipulation of normal development. As a globally significant food fish, improving tilapia welfare standards would benefit an enormous number of sentient animals. Certification schemes that include tilapia species and set minimum welfare standards are critically needed.