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 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 Quebec. The charter outlines a series of principles to collectively manage the use of the Great Lakes Basin's water supply. It also includes a notice and consultation process for proposals to divert large amounts of water out of the Basin and for large in-Basin uses. It was signed on February 11, 1985. In 2001, the Great Lakes Governors and Premiers signed