Bill and David,
I may have found the fish dying answer. At Mississippi Fishing website,
www.mdwfp.com/fishing.asp under the farm ponds discussion link, the moderator, a State fisheries biologist, discusses this problem relating to this time of the year. Evidently, cloudy conditions this time of the year causes low dissolved oxygen levels with the biggest problem occuring in overstocked ponds. You can read the whole explanation there. You don't have to do anything wrong. Mother Nature does it.
My ponds certainly qualify as overstocked. They were newly stocked last year and you can almost walk on the fatheads and bluegills.
