Pangasius (basa/tra catfish) is one of the world's most widely traded fish, primarily farmed in Vietnam. Welfare challenges in pangasius production include stocking density, water quality, and harvesting practices.
Pangasius welfare is shaped by the extreme scale of production in the Mekong Delta. The density of farming and the volume of fish involved means that even modest improvements in individual fish welfare standards would affect billions of animals. The hardiness of pangasius — their ability to survive poor water conditions that would kill more sensitive species — has historically been interpreted as meaning that poor conditions cause no welfare harm. This is incorrect: pangasius can survive suboptimal conditions but still experience physiological stress responses that indicate negative welfare states. ASC certification has raised standards for certified producers, but certified pangasius represents a minority of total production. The welfare gap between certified and conventional pangasius production is significant, and consumer choice of certified products can drive improvement at scale.