Fishes can be wintered either outdoors or indoors. This will depend on the construction of the entire pond according to the inclination of the owner. This article will focus about things that a hobbyist can do to properly protect and care for his fishes during winter if his pond is situated outdoors.
If youre living in a country where winter is the most prominent season of the year, better build a pond wherein a portion of it is about 30-45 inches deep. This will protect the fishes from long periods of cold spells. Even more drastic than cold water is the building up of gasses which are toxic in a pond that is iced over completely for a certain amount of time. Therefore, it is mandatory that a part of the ponds surface is kept open to enable the pond to circulate air that results to the disposal of deadly gasses and adds oxygen. You can accomplish this by:
a. Aerator. This is a large air stone that is operated by an aquarium air pump which can constantly create a small opening inside the ice. Unfortunately, placement is quite critical and hard to be arranged precisely. Ideally, the aerator should be placed halfway measuring from the deepest part of the entire pond...