Operators of fish farms, whether onshore or offshore, depend on a reliable supply of compressed air in order to ensure continuous, correctly dosed food distribution. This is another area where the many advantages of KAESER products score points. 

With our comprehensive range of rotary screw compressors and blowers, the perfect system or combination of systems, can be precisely tailored to suit any need.
All our blowers and compressors are designed and built to provide maximum durability and reliability. Moreover, impressive energy efficiency helps keep the largest part of total system costs to a minimum, whilst low maintenance requirement reduces costs even further.



Bubble curtain

In recent years, aqua-farmers have faced increasing problems with jellyfish and algae blooms. A so-called “bubble curtain” system has been found to be a simple, yet effective, method of preventing jellyfish and algae from adversely affecting the fish within the cages. When a threat is reported, a compressor is activated which produces a ring of air bubbles. The rising bubbles and water turbulence create a ‘curtain’, thus preventing algae or jellyfish from entering the cage. The ocean current drives the threat alongside the bubble curtain until it has passed the farm.

Feed barges

For modern offshore operating fish farms feed barges are essential. Some are capable of carrying up to 850 tons of feed. Innovative and efficient blower technologies from KAESER generate the required airflow to deliver the feed into the farming cages. Feed barges may also carry a stationary compressor for an airlift system to remove dead fish and sludge from the cages

Aeration and protection

Two major problems of cage farming are sea lice and oxygen deficiency. A particular aeration concept is used to deal with both problems at the same time. A compressor is used to blow air into the cage and to release it in a circular or triangular path with positive effects: A water flow is generated within the cage flowing from the deeper water towards the surface. This water is pushed from the cage into the top 10 m below the sea surface, thus keeping the copepod larval stage (the stage that infects salmon) out of the cages. The fish are forced to swim against the current which improves the quality of their meat. The rising bubbles also increase the oxygen saturation of the water, thus lowering the feed conversion ratio as well as increasing the overall health of the fish.


Dead fish and feces are vectors for diseases and infections causing further mortality, if not removed effectively and efficiently. The most reliable and efficient prevention is removing the remains via air-lift. Here, a conical device supplied with compressed air is placed at the lowest point of an aquaculture cage. A rotary screw compressor provides the air required to retrieve and transfer the remains and waste through tubing onto a barge or boat. Once recovered, the waste is separated from the contaminated water, which is then discharged in deeper water.

Rotary screw compressors

Rotary screw compressors deliver a reliable and efficient supply of quality compressed air. They are the preferred choice for users requiring constant pressure over prolonged periods. 

In aquaculture applications they are preferably used to supply PSA oxygen generators with compressed air, to form bubble curtains against algae or jellyfish incursion, or to create artificial upwelling in order to lift cool water from deeper layers up to the surface. To ensure that our rotary screw compressors operate as efficiently as possible, we developed our own special rotor profile. 

Our SIGMA PROFILE rotors provide you with energy savings of up to 15 % compared with conventional rotor profile designs. Furthermore, our SIGMA PROFILE airends boast an exceptionally long service life. This is due not least to the roller bearings we use: they are precision adjusted and generously dimensioned. Together with our in-house precision manufacturing processes, these advantages combine to deliver an exceptional product. The extraordinary reliability of our products, as well as our comprehensive service coverage, makes us the preferred air solutions provider for aquaculture applications.


Portable compressors

Compressed air whenever you need it, wherever you need it – even under the toughest offshore conditions: the main Kaeser plant in Coburg manufactures powerful machines with advanced, energy-saving engines and heavy-duty chassis in a wide range of models – from the smallest portable units to large compressors.

  • Many models feature a rotomoulded PE enclosure to ensure extreme dent resistance - even under harsh sea-going conditions
  • Simple and intuitive operation  
  • Optimal maintenance point accessibility prevents unnecessary downtime


Low-maintenance, highly reliable Kaeser blowers deliver pressurised air quietly and efficiently for multiple aquaculture applications:

  • for pneumatic conveying of feed 
  • for aeration of bio-filters and ponds

We provide two different concepts to meet your specific requirements:

  • Rotary lobe blowers with our efficient, three-lobe OMEGA blower blocks for minimal pulsation effects.
  • Rotary screw blowers with the energy-saving SIGMA PROFILE – designed by KAESER for optimal pressure and output. Rotary screw blowers can save up to 30 % energy compared to comparable roots blowers. 
Kaeser-ruuvipuhallinsarjat DBS, EBS ja FBS