Farmed Salmon Welfare: New Research and Industry Standards

Salmon farming welfare science is advancing rapidly, with new evidence on pain, stress, and positive welfare in fish informing both regulatory standards and industry practice. Understanding the latest research helps evaluate which improvements matter most.

Key Facts

Atlantic salmon have been farmed commercially for over 50 years, with Norway producing over 1.4 million tonnes annually
New research from the University of Oslo has shown salmon exhibit pain-like responses using brain imaging techniques
Sea lice infestation, which affects virtually all open-sea pen salmon farms to some degree, causes chronic tissue damage and immune stress
Mechanical sea lice removal methods (Hydrolicer, Thermolicer) cause additional acute welfare harms through temperature shock and physical injury
The Global Salmon Initiative (GSI) has committed members to welfare improvements including reduced mortality rates and lice thresholds
Norway has introduced a traffic light system restricting farm expansion in areas of high wild salmon impact
Closed containment systems eliminate sea lice infection risk and effluent to wild environments but have higher energy costs
Salmon have been demonstrated to seek out analgesics when in pain, providing strong behavioural evidence of pain experience

Welfare Considerations

Salmon welfare science has advanced faster than for almost any other farmed species, partly because the industry is economically significant and partly because researchers like Lynne Sneddon have pursued fish sentience research rigorously. The evidence now supports treating salmon as sentient animals whose pain, stress, and positive experiences matter morally. Current farming practice falls short of this standard in several areas: sea lice treatment causes acute stress and injury, mortality rates of 15-20% represent suffering at scale, and crowding prevents natural schooling behaviour. The most impactful welfare improvements are: closed containment systems that eliminate sea lice; rapid, humane slaughter; and third-party welfare monitoring with published outcomes. Consumer demand for certified higher-welfare salmon creates a market signal for these improvements.

What You Can Do

Choose salmon certified under RSPCA Assured or GSI higher-welfare standards
Ask retailers to disclose mortality rates and sea lice levels from their salmon suppliers
Support Fish Welfare Initiative advocacy for enforceable salmon welfare standards
Advocate for closed containment salmon farming investment through government and industry engagement
Reduce salmon consumption overall given the difficulty of verifying welfare claims throughout the supply chain
Support Salmon and Trout Conservation campaigns to protect wild salmon from sea lice amplification by farms
Engage with Norwegian and Scottish aquaculture regulators on welfare outcome requirements for licensed farms