Great Lakes are estimated at 900 trillion. The influx of parasitic lamprey populations after the development of the Erie Canal and the much later Welland Canal led to the two federal governments of the US and Canada working on joint proposals to control it. By the mid-1950s, the lake trout populations of Lakes Michigan and Huron were reduced, with the lamprey deemed largely to blame. This led to the launch of the bi-national Great Lakes Fishery Commission. "The Great Lakes: An Environmental Atlas and Resource Book" (1972) noted: "Only pockets remain of the once large commercial fishery." But, water quality improvements realized
Erie Canal Commission of these bodies. Afterwards the canal commissioners were minor state cabinet officers responsible for the maintenance and improvements of the state's canals. The office of Canal Commissioner was abolished in 1876, and their responsibilities were taken over by the Superintendent of Public Works in February 1878. The Canal Fund and the Canal Board were abolished in 1905. As the United States expanded into western New York and the Northwest Territory, the Great Lakes became an essential part of the system of waterways, on which merchants did most of their shipping. The easiest way from the Great Lakes to the Atlantic