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Important fish migrations take place in the Lower Mekong River of Southern Lao PDR during the dry and wet season months. The riparian communities are aware of these movements and target a large number of species using a wide range of fishing gear. The objectives of the research were to identify the main migratory species, the timing, fish production, direction, purpose, main influencing factors and the change in magnitude of migration between years. Research into the wet-season movements has been carried out from 2007 to 2013 in one rocky channel (Hoo Som Yai) at the Great Fault Line (Khong district) with supported by Fisheries Program of Mekong River Commision (MRC). The Catch Per Unit Effort (CPUE) data were recorded directly from fishers operating the Lee traps and measured water flow in Hoo Som Yai from late May to the end of September each year. The data were collected in wet season from 2007 to 2013 showed the main wet season migrants come from the families, Pangasidae, Siluridae catfish and Cyprinidae. The white fish were the dominant species that passed to this channel and follow by grey fish. A few black fish were also captured.