Salmonid Transport Welfare: Live Fish Movement and Stress Mitigation

Live transport of salmonids between hatcheries, grow-out sites, and processing is a major welfare risk point. Transport stress management determines both welfare outcomes and product quality.

Key Facts

Transport mortality in salmon can reach 5-15% without adequate preparation and monitoring
Fish are typically fasted for 24-48 hours before transport to reduce waste production and oxygen demand
Anaesthetics including AQUI-S (isoeugenol) and MS-222 (tricaine) are used for transport stress reduction
Transport water quality parameters including dissolved oxygen, ammonia, CO2, and temperature must be continuously monitored

Welfare Considerations

Transport exposes salmon to simultaneous stressors including crowding, netting, handling, unfamiliar water chemistry, and physical trauma. Cortisol spikes to 100-1000 times baseline during transport events, with immune suppression lasting days post-transport. Welfare-positive transport involves pre-transport conditioning, water quality optimisation, anaesthetic use where licensed, and journey time minimisation. Post-transport recovery monitoring (feeding behaviour, swimming pattern, fin condition) confirms welfare status.

What You Can Do

Support certification schemes that require documented transport welfare protocols for salmonid farms
Advocate for journey time limits and mandatory water quality monitoring requirements in aquaculture transport regulations
Choose salmon from farms with published fish transport welfare policies and post-transport recovery protocols
Encourage development of more humane transport technologies including improved oxygenation and anaesthetic delivery systems