Today i foumd 2 dead bluegill floating. The first i have had in the 2 years i have had the property.My first assumption was dissolved oxygen I was already informed of it being low in the spring when I had it tested and yesterday I installed 3 aeration diffusers.
Nobody commented on this for you. Fish mortality maybe well be tied to your introduction of aeration. If your pond has stratified with a thermocline in the warm summer, the water on the bottom has lost its O2. If the water column is suddenly turned over, the fish are now in low O2 water and may die if they can't find good water. There is a start-up procedure around somewhere. Something like... You run the aeration 30 min first day, 1 hr next day, etc. It starts things up slowly and fish are happier.
