Aquaculture

Finfish Welfare at Slaughter: Species and Methods

The welfare of finfish at slaughter depends on species-specific stunning requirements and the practical implementation of approved methods.

Key Facts

Percussive stunning requires precise impact location that varies by species
Electrical stunning effectiveness depends on current parameters calibrated for each species
CO2 stunning is widely used but causes distress through acidosis before unconsciousness
Trout and salmon require different stunning parameters despite both being salmonids

Welfare Considerations

Species diversity in aquaculture means that one-size-fits-all slaughter methods provide adequate welfare for some species and inadequate welfare for others. Operators using poorly calibrated electrical stunning may create tonic immobility rather than unconsciousness. Investment in species-specific research and operator training is essential for welfare claims to be meaningful.

What You Can Do

Choose fish from certified producers with documented species-specific slaughter protocols
Advocate for mandatory pre-slaughter stunning to be legally required for all farmed finfish
Support research into optimal stunning parameters for all commercially farmed species
Ask certifying bodies how they verify stunning effectiveness in producer audits