My neighbor has very similar pond to mine. Same depth and size also with no aeration - he says his is fine. Weird. I did drop two large trees onto the ice - about 20 inches in diameter - (They were like three feet below the water line and dead, so just used the ice as a way to easily cut them down) . I wonder if the vibration from the trees hitting the ice did any killing? Probably a stupid question, but it was probably quite a shock to the fish when the trees smacked the ice.
