Pangasius catfish from Southeast Asia are among the most traded fish globally. Welfare conditions in intensive Vietnamese production systems require significant improvement.
Pangasius (often sold as basa or swai) are produced in some of the most intensive aquaculture systems globally. Floating cage densities and pond systems on the Mekong Delta frequently exceed evidence-based welfare guidelines. The species physiological tolerance of low oxygen does not indicate welfare indifference — behavioral evidence suggests pangasius prefer higher dissolved oxygen levels when given a choice.
Social stress in dense systems causes increased aggression, fin damage, and chronic cortisol elevation. The lack of structural enrichment in pond and cage systems means pangasius spend their lives in essentially barren environments that do not allow expression of natural behaviors. While the welfare evidence base for pangasius is less developed than for salmonids, the precautionary principle argues for improvement.
Ice slurry chilling is the dominant slaughter method in pangasius processing. This method causes suffering in conscious fish and should be replaced with electrical stunning before slaughter. Some EU importers are beginning to require welfare-improved slaughter methods from their Vietnamese suppliers.