Basa fish are a type of catfish that come from Vietnam. It is considered a dangerous fish since it comes from a place where antibiotics are not used.
Basa fish are also found in Chao Phraya and Mekong in Indonesia. They are often sold in the international food market, but are not considered safe in North America and Australia due to health concerns. Other types of dangerous catfish include bocourti and swai, which come from the same region. Some basa fish will be labeled as "cobbler" or "pangasius." Anyone with a fish allergy should avoid basa fish, as the result could be fatal.