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 Recycling and Northern Development Canal of a Chicago diversion from Lake Michigan would harm downstream Canadian areas in the Great Lakes Basin. The Canadian government further stated that exhaustive studies had indicated no additional sources of freshwater were available in Canada to replace the waters that would be removed from the Great Lakes by the proposed diversion. Kierans disputed the accuracy of the 1959 Canadian government's position and asserted that the GRAND Canal could provide additional fresh water to the Great Lakes. Waters from the Ogoki River and Longlac are now being diverted into the Great Lakes at a rate equivalent to that taken by