Yes, fat head minnows and there are thousands of them. Thats why I thought the lack of bluegill/sunfish is the reason there were so many.
Understood. It would be very odd if that 4 lb. largemouth you caught was the only one in the pond, yet it's possible.
However, that Green Sunfish would be eating fatheads too.
There's always surprises and incorrect assumptions, so don't get down about it.
On a side note, some folks like mudcats (bullheads) while others don't. We remove every bullhead caught from our ponds.