Genetic selection for disease resistance in tilapia farming reduces welfare burden from disease outbreaks while improving production efficiency in an increasingly important global food fish.
Disease resistance genetics in tilapia represents a welfare improvement embedded permanently in the production population — once resistance alleles increase in frequency through selective breeding, every fish in the improved population carries better protection against the diseases that most commonly cause welfare crises in intensive tilapia production. Unlike management interventions that depend on daily implementation, genetic improvements persist across generations and spread automatically to all offspring. The welfare case for investing in tilapia disease resistance genetics is therefore particularly compelling: the welfare benefit compounds over time as the improved genetics spread through production populations, improving welfare outcomes for increasing numbers of fish.