Aquaculture Anaesthesia - Fish Handling Welfare

Using anaesthesia to reduce welfare impacts during fish handling procedures in aquaculture, including sampling and vaccination.

Key Facts

MS-222 (tricaine methanesulfonate) and AQUI-S (isoeugenol) are the most widely used fish anaesthetics in aquaculture
Anaesthesia reduces cortisol stress response to handling by 40-60% compared to unanaesthetised fish
Recovery time from anaesthesia is a key welfare indicator: excessively slow recovery suggests overdose
Vaccination of salmon by intraperitoneal injection is a major cause of welfare concern requiring anaesthesia protocols
Welfare benefits of anaesthesia must be balanced against handling stress of anaesthetic induction

Welfare Considerations

This topic carries significant welfare implications for the animals involved. Evidence-based management approaches and appropriate veterinary care can substantially improve outcomes.

What You Can Do

Consult your veterinarian or a specialist for guidance specific to your situation
Follow evidence-based management protocols and best practice guidelines
Monitor animals closely and intervene promptly when welfare concerns arise
Stay updated with current research, legislation, and industry standards
Share knowledge with others to improve welfare outcomes across the sector