Selective breeding and genetic improvement programs in tilapia aquaculture have transformed productivity but carry welfare implications that require careful management.
The genetic transformation of tilapia through selective breeding programs has dramatically increased production efficiency but introduced welfare trade-offs requiring active management. Extreme growth rates in GIFT strains can outpace skeletal development, causing spinal deformities and cardiovascular strain that reduce quality of life for affected fish. Social management in all-male systems requires careful density management since tilapia territorial behavior causes significant aggression and injury at inappropriate stocking densities. Hormonal sex reversal — the dominant method for producing all-male stocks — is a routine aquaculture practice whose welfare implications are underexplored. Water quality management remains the primary welfare lever in intensive tilapia systems. Emerging research on tilapia pain and stress responses is slowly informing welfare standards for this globally important species.