Known from Maeklong, Chao Phraya and Mekong basins. No longer exists as a naturally occurring species in the Chao Phraya ad Meklong basins. Seems not capable of reproducing in reservoirs and will probably disappear from these river basins when stocking of artificially reproduced fish is stopped. May still occur in Nan (Sirikit Dam) from artificially produced fry released by the Dept. of Fish. Staff at Sri Chiengmai near Nongkhai (Ref. 7427). In the Mekong, this fish migrates upstream to spawn from October to February from Kompong Cham in Cambodia to Chiang Khong in Thailand (Ref. 37770). In Sungkom at Nong Khai Province, it migrates together with two other Probarbus species, but spawns separately, during January-February (Ref. 37770). Early stage eggs could be observed in October-November (Ref. 37770). Also undertakes trophic migrations, mainly taken by juveniles and sub-adults at the onset of the flood season. At Nakhon Phanom, juveniles stay near the beach and when the beach begins to be covered with water, they migrate upstream and spend the flood season in flooded areas. At Loei, they move up the Loei River and into flooded areas and at this time, juveniles can not be seen in the Mekong (Ref. 37770). Esteemed food fish. The meat is considered excellent and the eggs are especially priced (Ref. 12369). Museum: Mekong, CAS 63028 (Chiang Khan); CAS 95474 (mainstream near Chiang Khan) (Ref. 5515); also from Phra Nakhon Si Ayutthaya, Kanchanaburi and Ubon Ratchathani (Ref. 37773). Also Ref. 2073, 12369, 26336, 26580, 36654, 43281.