Salmon Genetics and Welfare: Breeding for Welfare-Positive Traits

Selective breeding programs for farmed Atlantic salmon are beginning to incorporate welfare-positive traits alongside production efficiency metrics.

Key Facts

Atlantic salmon (Salmo salar) aquaculture produces approximately 2.7 million tonnes annually
Breeding programs have historically selected for growth rate, feed conversion, and disease resistance
Stress reactivity is heritable in salmon — low-reactivity lines show reduced cortisol responses to handling
Sea lice resistance has been partially achieved through selective breeding, reducing the need for chemical treatments
Spinal deformity rates, which cause chronic pain and welfare problems, have been reduced through nutrition and breeding
Welfare indicators including fin condition, wound prevalence, and abnormal swimming are now tracked in breeding programs
Norwegian and Scottish breeding programs have published commitments to welfare trait inclusion

Welfare Considerations

The integration of welfare traits into salmon breeding programs represents a structural intervention that improves outcomes for billions of fish. Unlike environmental enrichment or handling protocol improvements — which require farmer behavior change — genetic selection for welfare-positive traits (lower stress reactivity, disease resistance, reduced deformity rates) delivers benefit across all farms using those bloodlines. The challenge is that welfare trait measurement requires validated, objective indicators and economic justification to breeding companies. Research demonstrating that welfare-positive traits are compatible with — or even enhance — production efficiency accelerates industry adoption. Regulatory requirements that include welfare genetic metrics in breeding program approvals would further mainstream this approach.

What You Can Do

Support salmon welfare research organizations that work with industry on breeding for welfare-positive traits
Ask seafood retailers whether their salmon suppliers use breeding programs that include welfare trait selection
Advocate for regulatory frameworks requiring welfare trait consideration in aquaculture breeding program approvals
Choose certified salmon products from producers demonstrating welfare commitments in their supply chains