Found in the Mekong basin (Ref. 12693, 27732). Known from Tonlé Sap (common in November and December) (Ref. 36686), Mae Khong at Stung Treng, Prek Phan (Ref. 36654) and Great Lake (Ref. 33813). Undertakes upstream migration from the Mekong delta, around the saline intrusion zone to just below the Khone Falls from November to March (Ref. 37770). Migrates during full moon (or just before full moon at Kandal) from Kandal to Kompong Cham (Ref. 37770). From May to July, it migrates downstream from the Khone Falls, apparently to flooded areas in Southern Cambodia and the Mekong Delta (Ref. 37770). Juveniles around 2 cm appear during November-February from Stung Treng to Sambor and from July to October from Kratie to Kandal (Ref. 37770). Also Ref. 26580, 45353.