Operators of fish farms, whether onshore or offshore, depend on a reliable supply of compressed air. A short downtime of a blower or compressor can lead to mass mortalities. KAESER products ensure maximum process reliability and therefore minimize downtimes. This is why KAESER Kompressoren is the preferred supplier of air products to the aquaculture industry.

All our blowers and compressors are designed and built to provide maximum durability and reliability. Moreover, the impressive energy efficiency helps to keep the largest part of total system costs to a minimum, whilst the low maintenance requirement reduces costs even further. For the aquaculture industry, KAESER Kompressoren provides special products tailored to the rough conditions on fish farms.


Bubble curtain
Bubble curtain with compressed air from KAESER.

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 sea pen. 

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’, preventing algae or jellyfish from entering the pen. The ocean current drives the threat alongside the bubble curtain until it passes the farm.

Feed barges
Feed barges working with compressed air from KAESER.

Feed barges are essential for the operation of modern offshore fish farms. Some are capable of carrying up to 850 tonnes of feed. Innovative and efficient blower technologies from KAESER generate the airflow required to deliver the feed into the farming pens. 

Feed barges may also be equipped with a screw compressor for Sea Pen Aeration (SPA) systems, bubble curtains or airlift systems to remove dead fish from the pens.

Sea Pen Aeration (SPA)
Sea Pen Aeration to protect your fish.

Two major problems of sea pen farming are algae blooms and oxygen deficiency. Sea Pen Aeration systems can solve both problems at the same time. A compressor is used to blow air into a diffuser ring, which generates a upward flow within the pen that lifts cool, oxygen-rich water from the depths into the sea pen. 

At the surface the water flows outwards, preventing algae and plankton (as well as planktonic stages of sea lice) from entering the sea pen. The rising bubbles also increase the oxygen saturation of the water, thus lowering the feed conversion ratio, as well as improving the overall health of the fish.

Airlift to prevent diseases and infections.

Dead fish are vectors for diseases and infections, causing further mortality, if not removed effectively and efficiently. The most reliable and efficient prevention is removing the morts via air-lift. Here, a conical device supplied with compressed air is placed at the deepest point of an aquaculture pen. 

A rotary screw compressor provides the air required to retrieve and transfer the remains and waste through tubing onto a barge or boat. The contaminated water is then cleaned from waste and can be discharged into deeper water afterwards.

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. 
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