We are on the edge of Winter and at the beginning of a new season we start to evaluate any changes that may be necessary. It certainly feels like Winter is now with us so will this make a difference to the aeration needs of your pond? Aeration is a very crucial element in any pond. Every living thing in the pond requires a constant supply of oxygen and every process that happens in the pond is dependent on oxygen. The fish, plants and even the bacteria need oxygen. However we want to determine when aeration is necessary.