Welfare Science

Fish Anaesthesia Developments in Research Welfare

Advancing fish anaesthesia practices in research settings is a key 3Rs welfare priority in aquatic animal science.

Key Facts

Fish are protected under UK animal research legislation under Schedule 1 methods
Tricaine methanesulphonate remains the most used fish anaesthetic in research contexts
CO2 narcosis is aversive and is being replaced in welfare-conscious laboratories
Recovery monitoring and anaesthetic dosing accuracy are critical to preventing over-sedation
Training researchers in fish anaesthesia best practice is a welfare education priority

Welfare Considerations

Fish used in research experience stress and pain during handling and procedures if inadequately anaesthetised. Advancing anaesthesia practice requires both regulatory encouragement and positive education of researchers. The NC3Rs and Humane Slaughter Association provide evidence-based guidance that improves welfare while maintaining research quality.

What You Can Do

Support NC3Rs guidance on fish anaesthesia and 3Rs in aquatic research
Advocate for mandatory fish anaesthesia training in research ethics committee requirements
Follow Zebrafish to develop alternatives to invasive fish procedures
Learn about fish welfare in research from the Aquatic Animal Health resources