Farmed Salmon Deformity: Spinal and Jaw Welfare Impacts

Spinal and jaw deformities affect significant proportions of farmed salmon, causing chronic welfare harm - hatchery management and nutrition reduce prevalence.

Key Facts

Spinal deformities including vertebral compression affect 5-15% of salmon in some hatcheries
Jaw deformities prevent normal feeding behaviour and cause chronic welfare harm
Vitamin C deficiency, water temperature, and mechanical handling during early life contribute to deformity risk
Genetic factors affect deformity susceptibility - selective breeding can reduce prevalence
Deformed fish that cannot feed adequately face starvation alongside structural welfare problems

Welfare Considerations

Skeletal deformities in farmed salmon represent preventable chronic welfare harm. Fish with compressed vertebrae or jaw deformities cannot swim or feed normally and experience ongoing discomfort from abnormal skeletal mechanics. The causes are multifactorial - hatchery conditions, nutrition, and genetics all contribute - but the welfare science is clear enough to justify investment in prevention. Vitamin C supplementation, optimised water temperature and flow, gentle mechanical handling of larvae, and selection against deformity-prone genetic lines each contribute to reducing prevalence.

What You Can Do

Support aquaculture producers who monitor and report deformity rates transparently
Advocate for deformity rate monitoring to be part of aquaculture welfare certification
Choose salmon from certified producers with low reported deformity rates
Support research into hatchery management practices that reduce deformity incidence