Aquaculture

Fish Anaesthesia for Aquaculture Welfare Procedures

Anaesthesia in fish is increasingly used for welfare procedures including vaccination, marking and health assessment.

Key Facts

MS-222 (tricaine methanesulphonate) and clove oil (eugenol) are the most commonly used fish anaesthetics
Proper anaesthesia prevents stress and pain during handling, sampling and surgical procedures
Induction and recovery times vary significantly by species, temperature and dose
Overdose causes anaesthetic death; underdose leaves fish conscious during procedures
Regulatory approval for anaesthetics varies by country and species, limiting use in some settings

Welfare Considerations

Anaesthesia for fish welfare procedures is an important but underused tool. Unanaesthetised fish show stress responses during handling that include cortisol elevation, immune suppression and physiological disruption comparable to other vertebrates. Developing practical, approved anaesthetic protocols for aquaculture procedures is a priority for fish welfare improvement.

What You Can Do

Support research into approved fish anaesthetics for commercial aquaculture use
Advocate for mandatory anaesthesia for painful aquaculture procedures in national regulations
Choose fish from certified farms that use anaesthesia for welfare procedures
Engage with aquaculture industry bodies about standardising anaesthetic protocols