Pangasius (swai or basa catfish) is the world's most internationally traded freshwater fish, farmed in Vietnam's Mekong Delta under conditions that raise significant welfare and sustainability concerns.
Pangasius farming operates at a scale that makes its welfare significance enormous: hundreds of billions of individual fish are raised annually in conditions that welfare science would categorize as deeply inadequate. High stocking densities, poor water quality, and slaughter without stunning create welfare harms across the entire production cycle. The economic importance of pangasius to Vietnamese farming communities and to affordable protein supply in importing countries makes abrupt transitions difficult. The most tractable welfare improvements — improving water quality management, reducing stocking density, and introducing electrical stunning before slaughter — are technically achievable and should be incorporated into importing country retailer standards. Consumer awareness of pangasius welfare is extremely low relative to the scale of consumption.