Whoops sorry! I now see your pond is 2/3's of an acre and up to 16 feet deep. (I wish one could see the post at the same time one replies!)

In the least you need to snowblow the snow off your pond to allow photosythesis and to prevent a aquatic plant die off that uses oxygen.

If you are serious you should invest in an aeration system that uses a diffuser connected to an airline powered by a small compressor. I think you could get by with a 1.5 cfm compressor and the whole system shouldn't be more than $350.00. Electricity may be about $5.00 per month.

I would run an additional airline to the shallow end of the pond at about five feet and connec this up in the winter just before your ice forms. If you choose to run it in the summer (excellent for your pond and can prevent an early fall dieoff of fish) have an airline connected to a diffuser that goes out to the center of the pond. Or you could simply suspend your diffuser in winter a about 4 or 5 feet below the surface. Orange juice jugs work well for this. Don't use milk jugs as they detteriote to fast.

If pigs could fly bacon would be harder to come by and there would be a lot of damaged trees.