JHFV, If your pond is over 10' deep, then just by adding an aerator to your 40 year old pond you could possibly double the number of fish in it by giving them availability to the ENTIRE body of water year-round. And if there is muck build up from the years the depth will quickly come back as well by getting O2 to the bottom sediments for rapid decay. If you have never had a summer turnover cause a fish kill in 40 years, I want to be standing close to you in case of a lightening storm because you are a truly blessed man!
