Most fishing is carried out by obsolete fleets and very often directed at fish stocks that are already heavily exploited. Further increasing aquaculture production could contribute to supplying seafood and fish at lower costs to the population, thereby reducing pressure on natural fishery resources. However, its potentially negative impact on aquatic ecosystems should be taken into account. Efforts are being made to develop new approaches and techniques, including run-of-river projects in suitable conditions, as development of dams for large hydro can have an adverse impact on river ecosystems and local communities.