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 and St. Lawrence Governors and Premiers Lakes Governors in 1983. The original goal was to create a non-partisan forum to promote regional agreements on issues of concern for the states of the Great Lakes region. In 1989, the Governors of New York and Pennsylvania joined the council. In more recent years, the Premiers of Ontario and Quebec joined with the Governors as associate members, and in 2015, the organization launched the "Conference of Great Lakes and St. Lawrence Governors and Premiers," to signify the increasing binational cooperation. Since its inception, the Conference has led regional efforts to protect the environment and accelerate the region's economy. The