Lab Fish Welfare Beyond Zebrafish: Medaka, Stickleback, and Others

Beyond zebrafish, multiple other fish species are widely used in research with varying welfare considerations, requiring species-specific welfare standards across this diverse and growing group.

Key Facts

Medaka, three-spined stickleback, killifish, and salmon are among the major non-zebrafish research species
Each species has distinct behavioral, thermal, and social requirements that generic fish welfare guidelines may miss
The 3Rs principle applies to all vertebrate research species but implementation is uneven across fish species
Behavioral evidence for pain-like states has been documented across multiple teleost fish families
Regulatory coverage of fish research welfare varies between jurisdictions, with some excluding early life stages

Welfare Considerations

Lab fish welfare is a growing field responding to the rapid diversification of fish model systems in biomedical research. The relative scientific maturity of zebrafish welfare guidelines contrasts with the limited species-specific guidance for other commonly used fish. Applying generic vertebrate welfare principles requires understanding each species' specific ecology, social organization, and behavioral indicators of stress. The expansion of fish model systems in research carries a welfare obligation to develop species-specific husbandry and welfare assessment standards rather than extrapolating imprecisely from zebrafish or mammalian models.

What You Can Do

Support the development of species-specific welfare guidelines for non-zebrafish model fish species
Advocate for welfare training specific to each fish species used in research institutions
Engage with 3Rs organizations working on refinement of fish research procedures across all species
Support research into welfare indicators and husbandry optimization for diverse laboratory fish species