Environmental scientists and hydropower experts will meet in Ho Chi Minh City today to discuss an assessment of the environmental and social impacts of the 12 hydropower dams proposed for construction on the Mekong River mainstream, the Mekong River Commission (MRC) said in a statement Sunday. One of the key issues to be discussed will be the effect the proposed dams will have on freshwater fisheries in the lower Mekong basin, the statement added. The two-day meeting, which winds up Tuesday, will be attended by representatives from MRC member countries Cambodia, Laos, Thailand and Vietnam.