The use of round tanks in aquaculture is favored especially in intensive farming systems whether in hatcheries or grow-out operations. The preference of these tanks is based on the features of these tanks including its naturally self-cleaning action.
When water enters any of these tanks, water swirls around the tank and because of the bottom slope towards the center, the solid loadings (feces and uneaten feed) are swept to the central outlet, where they are flushed out in the discharged water.
While round self-cleaning tanks are often made of fiberglass –especially for smaller sizes- as shown in the photo, it could be constructed of other materials such as steel or concrete.
In addition to the self-cleaning features, these tanks are essential for active swimming fish species and also offer a better mixing of water and secure more efficient oxygenation.