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
Neath and Tennant Canal in March 2008. The plate girder aqueduct is believed to be the longest single span aqueduct in the UK. It is wide, and includes a footpath on both sides of the navigation channel. A new car park and slipway were provided from the B4242, and the Clun locks were renovated, to give of navigable canal from central Neath to Abergarwen. Following improvements, the towpath between Briton Ferry and Tonna has become a cycle route, in conjunction with Sustrans, the sustainable transport charity. Several obstacles remain before the canal restoration can be completed. To join the two navigable sections a new