The Panama Canal will cut the number of ships passing through it starting next month because of drought caused by the El Nino phenomenon, the operator of the strategic waterway linking the Atlantic and Pacific said on Thursday. From September 3, the number of vessels allowed through each day will fall from 36 to 34 due to low water levels in two artificial lakes that feed the canal, the Panama Canal Authority said. It will drop to 32 from September 15 on, the agency said.