Genetics and Welfare in Aquaculture

Selective breeding programmes in aquaculture can improve both production efficiency and animal welfare — but genetic selection for welfare traits requires deliberate commitment.

Key Facts

Atlantic salmon selective breeding has improved disease resistance, growth rate, and skeletal quality over decades
Sea lice resistance is an emerging selection target in salmon breeding programmes
Spinal deformities affect up to 15% of some salmon populations; breeding for skeletal robustness reduces this
Aggressive behaviour in farmed fish has a heritable component that can be selected against
Triploid fish used for sterility have different welfare profiles from diploid fish that require specific management

Welfare Considerations

Genetic selection in aquaculture has historically focused on growth rate and feed conversion efficiency. The welfare consequences of intense selection for growth — metabolic stress, cardiovascular problems, reduced disease resistance — parallel the broiler chicken situation in terrestrial farming. Deliberately incorporating welfare traits — disease resistance, behavioural calm, skeletal robustness — into breeding indices alongside production traits would significantly improve fish welfare. The genetic tools to do this exist; the barrier is willingness to accept modest productivity trade-offs for welfare gain. Regulatory requirements for welfare trait inclusion in breeding programmes would accelerate this shift.

What You Can Do

Support research into the heritability of welfare-relevant traits in farmed fish species
Advocate for welfare trait requirements in aquaculture breeding programme licensing
Choose farmed fish from producers using breeding programmes with documented welfare trait selection
Engage with aquaculture breeding companies about incorporating welfare outcomes into selection indices
Support the development of validated welfare indicator databases for aquaculture genetic programmes