Pangasius, sold as basa or swai, is one of the most imported fish in Western countries, primarily from Vietnam. Welfare conditions in pangasius farming vary widely and are poorly regulated compared to European aquaculture standards.
Pangasius welfare is difficult to assess from consumer countries because supply chains are long, verification is challenging, and regulatory standards in production countries are less developed. High stocking densities create chronic crowding stress, while antibiotic use can mask infectious disease welfare problems that proper management would prevent. Pangasius's ability to breathe air means they can survive conditions that would kill most fish, but survival is not welfare — these conditions cause significant physiological stress. Responsible sourcing requires certification schemes with farm-level welfare auditing. Consumer pressure for lower prices creates economic incentives that drive intensification at the expense of welfare, making market standards and regulatory requirements the most effective levers for improvement.