The Mekong giant catfish, Pangasianodon gigas (Thai: ปลาบึก, rtgs: pla buek, pronounced [plāː bɯ̀k]; Khmer: ត្រីរាជ /trəy riec/; Vietnamese: cá tra dầu), is a very large, critically endangered species of catfish (order Siluriformes) in the shark catfish family (Pangasiidae), native to the Mekong basin in Southeast Asia and adjacent China.