A young fish vendor in the market at Akosombo. Since completion of the dam in 1965 catches have grown from a few thousand tons to sixty thousand tons. - - Volta Lake Research. The construction of the Volta dam at Akosombo has brought much needed hydro-electric power to Ghana's industry. It has also created one of the world's largest man-make lakes - 3,275 square miles of water covering valleys and hills. A three-year