From the Hydro Tasmania Facebook page:

Effective immediately, all Hydro Tasmania lakes and boat ramps are closed to help prevent the spread of COVID-19, along with our campgrounds. It’s a difficult but simple message: if you were planning on fishing, water skiing, camping, hunting or otherwise visiting Hydro Tasmania lakes or land for the Easter break or beyond, you must stay home. Even if you’re travelling alone, there are always risks. Please help us by following the government’s advice to stay home and stay safe, so we can all throw a line in when life returns to normal!