Selective breeding programs for tilapia have focused heavily on growth rate and disease resistance, with emerging interest in selecting for behavioral traits that indicate better welfare.
Genetic selection has been the most powerful tool in aquaculture productivity improvement, but welfare traits have been largely absent from selection criteria in tilapia programs. This represents a missed opportunity — the same tools that have doubled growth rates could also select for reduced aggression, improved stress resilience, and calmer behavior under farming conditions. There is growing interest from the aquaculture genetics community in expanding selection criteria to include behavioral and physiological welfare indicators. If adopted, welfare-focused breeding could create tilapia strains better suited to the high-density farming environments they inhabit, reducing chronic stress and aggression-related injury across billions of fish. This would represent a systemic welfare improvement through genetic rather than management change.