Swai is a white-fleshed fish with a bland flavor commonly imported from Vietnamese fish farms. “Asian catfish” was once used in the United States, but it is now prohibited by law. Swai and American catfish belong to distinct families, yet they are related.
Swai fish is more likely to be found frozen outside of Southeast Asia, as it is sent from that region to keep fresh. Consumers will rarely see the fish intact; it is mostly offered as fillets for ease of use.