Animal Welfare Science

Applying the Five Domains to Fish Welfare Assessment

The Five Domains welfare assessment framework, designed to evaluate welfare across nutrition, environment, health, behavior, and mental state, is increasingly being adapted for fish welfare assessment.

Key Facts

Five Domains model was developed by David Mellor and colleagues in New Zealand
The framework covers nutrition, physical environment, health, behavioral interactions, and mental state
Fish welfare application requires species-specific adaptations for aquatic environments
Mental state assessment in fish focuses on approach-avoidance behaviors and stress indicators
The framework enables positive as well as negative welfare assessment

Welfare Considerations

Applying a comprehensive welfare assessment framework to fish requires acknowledging that fish have experiences — of hunger, fear, pain, and potentially comfort and curiosity — that matter morally. The Five Domains framework provides a structure for systematically evaluating all dimensions of fish welfare, moving beyond simple mortality and disease metrics to consider the full range of animal experience.

What You Can Do

Support adoption of Five Domains-based welfare assessment for fish in aquaculture
Advocate for fish welfare regulation that addresses all five domains
Donate to welfare science programs developing fish-specific assessment tools
Engage with aquaculture certification bodies about their welfare assessment frameworks
Follow developments in fish welfare science through journals including Animal Welfare