The giant pangasius, paroon shark, or Chao Phraya giant catfish (Pangasius sanitwongsei) is a species of large freshwater fish in the shark catfish family (Pangasiidae) of order Siluriformes, found in the Chao Phraya and Mekong basins in Indochina. Its populations have declined drastically, mainly due to overfishing, and it is now considered Critically Endangered.

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