In my experience, I have not seen a fish kill due to increased water temperatures through aeration unless we are dealing with cold water fish. Even in the most severe heat waves and dry conditions in Texas... if anything, aeration is more important than ever when temperatures increase. I am very sorry you lost your fish ~ it does appear to be oxygen related since the big bass went first. Unfortunately once that chain of events is set into motion, there is little you can do to stop the kill. I personally believe dying vegetation could have increased your BOD to the point where the aeration system couldn't keep up...
