Aquaculture

Farmed Fish Anaesthesia Welfare in Research and Treatment

Anaesthesia of fish for veterinary procedures and research reduces welfare harm but its use remains inconsistent across the industry.

Key Facts

MS-222 (tricaine methanesulfonate) is the most widely used fish anaesthetic globally
Fish anaesthesia reduces handling stress, cortisol spikes, and mortality during procedures
Welfare regulations for fish anaesthesia vary significantly between countries
Clove oil (eugenol) is a natural alternative with adequate efficacy for short procedures
Recovery time monitoring after anaesthesia ensures welfare during the critical post-procedure period

Welfare Considerations

Anaesthesia for fish veterinary procedures and research is now recommended by major welfare bodies as standard practice. Its inconsistent uptake reflects both cost barriers and residual scepticism about fish sentience that the evidence no longer supports.

What You Can Do

Support aquaculture welfare standards requiring anaesthesia for invasive procedures
Advocate for consistent fish anaesthesia requirements across research and production contexts
Choose certified aquaculture products from operations using veterinary welfare protocols
Learn about fish anaesthesia as a welfare indicator in both research and production settings