Our lake in the Texas hill country has gone from 7.5 acres to about 1.5 acres now. There is NO rain in the forecast. I think the deepest part is probably 12-13 feet deep right now. What can I expect? Is it at a point where the fish will start dying now or does it need to be 1/2 acre and 3 feet deep to kill them off? Anyone recommend something I can do?