I personally run the aerator 24/7 at the deepest part of the pond. My pond is 1/4 acre and 9 feet deep at the deepest spot. I had temps hitting 75 deg. last summer but my trout did fine. I even fed them the entire time, but I cut down the amount of food during high temps. My pond is a water table pond and I'm thinking I must get some sort of water exchanging to keep the temps cooler.
