Fig. 1: Distribution of river barriers, fish occurrence, and species richness across the Mekong Basin.

The main channel barriers a, fish occurrence records b, and cumulative fish species richness in each sub-basin and the location of seven ecological regions (i.e., Himalaya, Upper Mekong, Middle Mekong, Chi-Mun, 3S, Tonle Sap and Delta) of the Mekong Basin c.