Zebrafish Welfare in Research | Animal Welfare Hub

Zebrafish are increasingly used in biomedical research. Their welfare needs are now legally recognised and scientifically characterised.

Key Facts

Zebrafish became the third most used vertebrate in UK research after mice and rats
They are protected under UK legislation as regulated animals from 5 days post-fertilisation
Zebrafish can perceive pain and show analgesic-responsive responses to noxious stimuli
Enrichment including substrate, hiding structures and conspecifics improves zebrafish welfare
Optimal water quality including temperature, pH and dissolved oxygen is critical
Group housing is preferable to isolation for most research purposes
Husbandry refinements including pain-free procedures and anaesthesia for noxious interventions are now standard in high-quality facilities

Welfare Considerations

Zebrafish welfare science has advanced rapidly as their research use has grown. Recognition that zebrafish perceive pain and have welfare needs beyond mere physiological maintenance has driven significant refinement in research protocols. Applying the 3Rs principles to zebrafish with the same rigour as for mammals is both a legal requirement and an ethical obligation. Their small size and large group sizes make housing welfare particularly important.

What You Can Do

Support research institutions demonstrating comprehensive zebrafish welfare programmes
Advocate for equal application of 3Rs principles to zebrafish as to mammalian research
Support research into zebrafish-specific pain management and enrichment
Engage with regulatory bodies to ensure zebrafish protection matches the scientific evidence for their sentience