great Bill, Thank you. It seems to me that relatively soon would be good timing for a rotenone treatment. My reasoning is this, let me know if you think it is sound reasoning.
-Rotenone is not as effective on fish eggs.
-I would assume that right now bluegill and sunfish spawns are not taking place.
-meaning no rotenone resistant fish eggs are sitting waiting to weather the rotenone storm and hatch
-meaning if rotenone was applied right now, it would kill all existing fish, leaving a blank slate and no hidden surviving fish eggs to pop up as a problem.

What kind of cost am I looking at to treat each pond?

Would pumping them down make a difference?

How about pumping them all down, then treating with a much decreased amount of rotenone in the remaining puddle that could not be pumped?