They live primarily in the main channel of the river, where the water depth is over 10 m (33 ft), while researchers, fishermen and officials have found this species in the Tonle Sap River and Lake in Cambodia, a UNESCO Biosphere Reserve. In the past, fishermen have reported the fish in a number of the Mekong's tributaries; today,[when?] however, essentially no sightings are reported outside of the main Mekong river channel and the Tonle Sap region.