Lake Fidler

Lake Fidler is a meromictic lake beside the Gordon River in the Wilderness World Heritage area of the west coast of Tasmania, Australia. The lake has a layer of fresh water overlying an anoxic salt water layer. The meromictic lakes and ponds of the Gordon River were discovered by D.A. Hodgson and Professor Peter Tyler (reported 1996).

It became evident that, following the establishment of a hydro-electric power industry on the Gordon River, the flows of fresh water into the lake were disturbed and the anoxic salt layer was declining in depth. Previously, low river flows at certain times of the year allowed salt water to migrate upriver and occasionally spill into Lake Fidler through a narrow channel joining it to the river, thus recharging the salt water layer.