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
Gosen Canal also able to navigate between the two lakes using the roughly parallel "Gosener Graben". Besides seeing considerable sightseeing and leisure traffic, the canal today also forms a link in a commercial navigation route from the limestone workings at Rüdersdorf, which reaches the Flakensee by a lock at Woltersdorf. <BR> Gosen Canal The Gosen Canal () is a canal in the eastern suburbs of Berlin, the capital city of Germany. It takes its name from the village Gosen, at the southern end of the canal. It is in length and links the Dämeritzsee and Seddinsee lakes. The Dämeritzsee and Seddinsee are