A open lake is not a controlled environment - unlike a person's house. You cannot change out the water in a lake, it is exposed to all sort of weather and climatic conditions, fauna and flora etc.
The same applies to open farming vs growing something indoors.
Now coming to this example about vertical farming - at much larger scale you will not get the sort of yield/sq.ft you get at a much smaller scale - even in indoor farming.
The same applies to open farming vs growing something indoors.
Now coming to this example about vertical farming - at much larger scale you will not get the sort of yield/sq.ft you get at a much smaller scale - even in indoor farming.