I have a 1/5 acre pond that was dug last summer. it is clay soil. Max depth of 15 feet. In early May we put 40 perch, 50 bluegill, 10 sunfish, 10 crappie, and 2 male white suckers in there. I added an aerator a month ago with no problems. A week ago we had constant rain for 2 days. 4 days ago 38 of the perch and one of the sunfish were dead. The next day the last 2 perch, both suckers, and one bluegill were dead. No other deaths since then? Any insight into what happened? We checked the pH and it was 8.6.
