"Carps (Cyprinidae) threatened by mainstream dam development: For each dam crossed, the downstream mortality rate is predicted to be 35% for the goldfin tinfoil barb (Hypsibarbus malcolmi), 70% for the violet giant barb (Cosmochilus harmandi) and 80% for the sharp-nosed catfish (Pangasius conchophilus)" auf http://www.mrcmekong.org/Catch-Culture/vol15_3Dec09/modelling-impacts-of-mainstream-dams.htm