Aquaculture and fish farms need air supply system. Air is supplied by a roots type blower for effective pressure. Besides supplying oxygen to the hatchery, the air supply also provides air circulation and mixes the water to ensure the sugpo larvae to stay suspended at a same distribution. Distribution lines are installed with PVC pipes.

The water has to be treated before sending to the fish. Water should also be disinfected to decrease microorganisms, it is important for eggs and small fry. Aeration is also necessary to raise the oxygen and to eliminate potential supersaturation of carbon dioxide and nitrogen. Aeration in water treatment for aquaculture and fish farms is provided by roots blowers.

Positive displacement lobe blowers are also employed for supplying air or oxygen in biofilm. In an up-flowing filter the water, it is essential to add air or oxygen with pressure for bacteria in order to get enough oxygen in biofilm.