Last Spring they overlapped by a short window if I remember correctly. I didn't add trout this Fall, and with the way that the water table dropped, I'm glad that I didn't. In the Fall, the trout and tilapia should only be together in the pond for a week or 2, depending on the weather. I was told to add the trout when surface water temps approached 60°F.
If I can get the water level up (again, depending on mother nature) and I can get an aeration system figured out that will not warm up the lower, colder water, I might be able to keep trout all summer. I now have a boat for the pond, and can take temps in the deepest part of the pond. I might be able to borrow Cecil's O2 meter to check O2 levels down there as well.
