Farmed Pangasius: Density, Water Quality, and Welfare

Pangasius (Tra or Basa catfish) is one of the most widely exported fish in the world, with welfare concerns centering on extremely high stocking densities and water quality management.

Key Facts

Vietnam produces over 1.5 million tonnes of pangasius annually, making it one of the largest farmed fish producers globally
Commercial pangasius ponds often operate at stocking densities of 50-80 kg per cubic meter
Pangasius are air-breathing fish that can tolerate low oxygen conditions, but this tolerance is exploited commercially
Welfare studies show elevated stress hormones and fin damage at high commercial densities
ASC certification for pangasius has improved some practices but welfare standards remain less stringent than European aquaculture

Welfare Considerations

Pangasius farming welfare reflects the tension between the species relatively high tolerance for poor conditions and the welfare costs imposed even on tolerant fish at extreme densities. While pangasius can survive conditions that would kill salmon or trout, survival is not welfare. At commercial densities, they show elevated stress responses, increased aggression, and chronic fin damage. Their physiological tolerance has been used to justify conditions that cause ongoing discomfort. Welfare-conscious production requires meaningful reductions in stocking density and systematic water quality management.

What You Can Do

Choose ASC-certified pangasius when purchasing this species to support minimum standards
Reduce overall fish consumption given the systemic welfare challenges across aquaculture species
Advocate for welfare standards to be strengthened in pangasius certification schemes
Support research into welfare indicators specific to pangasius and catfish species