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
Great Lakes Charter an Annex to the Great Lakes Charter. This led to the Great Lakes-St. Lawrence River Basin Sustainable Water Resources Agreement of 2005 and the Great Lakes Compact which became effective in 2008. The Council of Great Lakes Governors serves as secretariat to the Governors' and Premiers' Regional Body created by the Agreement and the Governors' Compact Council created by the Compact. Great Lakes Charter The Great Lakes Charter is a good-faith agreement among the Governors of the U.S. states of Illinois, Indiana, Michigan, Minnesota, New York, Ohio, Pennsylvania and Wisconsin, and the Premiers of the Canadian provinces of Ontario and