Aquaculture

Milkfish Welfare in Tropical Aquaculture Systems

Milkfish is a major aquaculture species in Southeast Asia and the Pacific, with welfare considerations centred on stocking density and handling practices.

Key Facts

Milkfish production exceeds 1 million tonnes globally, with the Philippines as the leading producer
They are herbivorous filter feeders adapted to brackish and marine environments
High stocking densities cause oxygen depletion and increased disease susceptibility
Traditional backyard pond culture provides lower stocking densities than intensive systems
Export-oriented intensive production has expanded significantly in recent decades

Welfare Considerations

Milkfish welfare is primarily affected by stocking density and water quality management. In intensive pond systems, oxygen depletion during algal bloom crashes causes acute welfare emergencies and mass mortality. Chronic overcrowding suppresses immune function. Traditional low-density pond culture systems, while less productive per unit area, provide significantly better welfare conditions. Aeration systems are widely used in intensive operations to manage oxygen.

What You Can Do

Support sustainable milkfish products from certified low-density production systems
Encourage adoption of aeration standards as minimum welfare requirements
Advocate for milkfish inclusion in regional aquaculture welfare guidelines
Ask seafood suppliers about dissolved oxygen monitoring protocols in their supply chains