Wallago attu, theSarengcatfishis afreshwatercatfishof the familySiluridae, native toSouthandSoutheast Asia.Wallago attuis found in large rivers and lakes in two geographically disconnected regions,with one population living over much of theIndian Subcontinentand the other in parts ofSoutheast Asia. Thisspecies can reach a length up to 1.1m (3ft 7in). This catfishis one of the fish species that has been used as food in Southeast Asia sinceancient times.