Research Animals

Welfare of Laboratory Zebrafish in Research

Zebrafish have become a primary model organism in biomedical research, and their welfare considerations are increasingly recognized and regulated.

Key Facts

Zebrafish are the second most common vertebrate in research after mice
Their transparent embryos allow direct visualization of development
They are used in studies of genetics, neuroscience, and drug development
The 3Rs framework (Replace, Reduce, Refine) applies to fish research
Larval zebrafish may be sentient earlier in development than previously assumed

Welfare Considerations

Zebrafish welfare in research is an area of growing recognition. Their pain reception, stress responses, and behavioral sophistication indicate significant capacity for suffering. Group-housed fish in enriched tanks have better welfare than isolated fish in bare tanks. Breeding selection for research traits can cause chronic health problems. Euthanasia methods need to account for fish physiology. Regulatory requirements for fish welfare are expanding.

What You Can Do

Support research institutions with strong animal welfare programs
Advocate for zebrafish welfare training for all researchers
Support development of in vitro and computational models to replace animal research
Follow 3Rs principles when conducting or reviewing fish research proposals