Theo and AP,
Thanks for the input. This pretty much lines up with my thoughts even though I didn't want to think it.

Guess that's why this pond has only had minnows in the 40 years I've known it. No sense trying to re-stock. They'll just continue to be wiped out every couple years.

IMO this pond is not worth the trouble or cost to set up aeration. It is pretty much unattended from October through April. Is there a species that can survive better in low temps and low DO?

rick