Sustainable aquaculture in closed fish cages

Complete system with integrated infrastructure

Aquafarm Equipment has solved some of the biggest challenges faced by modern aqua-culture industry. We have developed a cost-effective, closed fish cage for post-smolt production that prevents the escape of fish, drastically reduces the risk of salmon louse, and reduces the release of organic nutrients and waste into the surrounding environment.

The result is the Aquafarm closed cage system. Developed and thoroughly tested in close cooperation with Marintek, DNV GL, Norconsult, Multiconsult and SINTEF. Our innovative fish-cage concept has been certified according to NS 9415:2009 and Nytek, allowing for one million fish up to one kilogram.

Since 2013, we have worked closely with Mowi (Marine Harvest) to carry out full-scale tests of our closed fish cage for post-smolt production – with very good results. Together, we have fine-tuned and perfected our post-smolt facilities.

Now we’re making the next step. Aquafarm Equipment are working to establish test facilities for production of both brood fish and market-ready fish.

The closed cage is built from GRP elements and reinforced with steel in areas that endures the most stress. The cage consists of several elements bolted together with use of a special technology.

The design also includes a pump system, which, through a strainer unit, extracts large volumes of water from a depth of 25 meters or more.

The pumps have a high efficiency and reliability securing very low operating cost, and installation above sea level gives easy access for service and maintenance. A specially designed hatch system is installed in the side walls. The hatches are patented and give an exceptional hydraulic flow inside the cage. A separate (optional) system for inserting oxygen into the water flow is also located on the barge.

As the concept of the cage is to collect the waste from the fish and feed it may be located inside fjords and close to the shoreline. Waste from the fish and other pollution in the cage is collected in the sloped bottom cone. A flexible pipeline connects to the low point and leads up to the mud separator.


Technical Data

Inside diameter: ø40 m

Circumference: 126 m

Cage Depth: 22 m


Certified design and construction according to NS9415:2009 and NYTEK


Design Wind : v = 30 m/s (Severe Storm)

Current: 1,0 m/s

Lifetime: 25 years


Gross Volume: 21.000 m3

Significant Wave Height: Hs = 2,0 m

NY Test
The results of tests of our post-smolt facility speak for themselves.


What we can provide for you


Healthier fish

  • Low mortality
  • No need for de-lousing
  • No disease registered


Improved economy

  • Lower production cost than open cages
  • Reduced energy consumption
  • Long lifespan


Safe working environment

  • Stable and secure working platform
  • Plenty of storage space
  • Safe access by boat


Organic waste is a resource

  • Significant amount of waste is collected
  • All unconsumed fish-pellets recycled
  • Used for many purposes


Optimized water quality

  • UV-filtration

Healthier fish

Closed facility with numerous advantages

Closed facilities have numerous advantages that have a positive impact on fish health.

In Aquafarm Equipment’s design water is piped in from a depth of 25–40 metres to avoid salmon lice and patogenes and to provide an optimal production environment. Our third-generation fish cage has the option of full treatment of the intake water.

The de-lousing process subjects the fish to considerable stress. Our fish-cage concept virtually eliminates the need for mechanical handling of the fish, as well as the need for chemicals.

This is clearly beneficial to fish health.

  • No need for chemicals
  • No need for mechanical handling of fish
  • Superior control of water quality: oxygenation and pH level
  • Dramatic lower stress levels
  • More stable water temperatures, which result in increased feed uptake
  • Water currents can be adapted to the size of the fish
  • Strong currents help fish develop musculature, increasing its quality
  • Increased resistance to disease
  • As a result of these factors, mortality is extremely low – less than 0.5 %.

Improved economy

Several economical benefits

With our floating fish cages, the cost of pumping in water is kept to a minimum. While open fish cages require considerable resources to be spent on de-lousing and disease prevention, these costs are eliminated with our closed fish-cage concept. Full-scale tests confirm the substantial economic benefits for fish-farming facility’s bottom line.

  • Total production costs per kilo are lower than in open fish cages
  • Low investment costs compared to land-based facilities
  • Reduced energy consumption
  • Excellent rates for feed uptake
  • More rapid fish growth – and shorter production time
  • Lower mortality
  • Organic waste reclaimed as a resource
  • Fish cages that have a long lifespan

The expected lifespan of Aquafarm Equipment’s fish cage is 20 years. As a result, amortised costs are drastically lowered, with considerable environmental benefits.

Produksjonskostnad (NOK) pr kg slaktet fisk, levende vekt Trad. Sjøanlegg 100g – full utvekst Postsmolt fra AFE – Full utvekst Postsmolt fra RAS – full utvekst
Total smoltkostnad 3,49 7,46 9,05
Totale oppstartskostnader og arbeidskostnader (NOK/kg) 2,53 1,58 1,58
Total fôrkostnad (NOK/kg) 15,04 12,06 12,06
Behandlingskostnad (NOK/kg) 2,99 1,87 1,87
Faste operasjonelle kostnader (NOK/kg) 1,98 1,17 1,17
Totale forsikringskostnader (NOK/kg) 0,18 0,15 0,15
Totale ensilasjekostnader (NOK/kg) 0,15 0,14 0,14
Totale avskrivingskostnader (NOK/kg) 1,76 1,04 1,04
Totale produksjonskostnader (NOK/kg) 28,13 25,48 27,06
Total lusebehandlingskostnad (NOK/kg) 3,77 2,48 2,54
Total produksjonskostnad dødfisk (levende vekt) (NOK/kg) 2,65 1,96 2,16

Safe working environment

Further improving work safety

Ensuring a safe and effective working environment has been priority throughout the development of our fully-integrated system. Even though safety within the aquaculture industry has been improving, we firmly believe it can be improved further. For instance, ensuring the safety of personnel on plastic fish-cage walkways can be a challenge.

Aquafarm Equipment’s elimination of the problem of organic waste will allow placement of fish-farming facilities in more sheltered areas of our coast. This shortens the employee commute, lessens the challenges of accessing facilities in bad weather, and achieves a much safer working environment.

  • A stable and secure work platform
  • Designated areas for equipment storage
  • Safe access by boat
  • All infrastructure on a single platform

Organic waste is a resource

Whereas organic waste from open fish cages presently flows into the sea, Aquafarm Equipment believes this is a valuable resource that should reclaimed and used.

Organic waste from fish farms has many uses, and additional ones are being explored:

  • fertiliser and soil improvement supplement
  • bio-gas production
  • production of concrete
  • extraction and recycling of phosphorus

Moreover, uncomsumed fish-pellets are collected and recycled.

Optimized water quality



About Aquafarm

Highly qualified specialists

Aquafarm Equipment AS is the world’s leading designer and producer of floating closed fish cage systems.

We work closely with Marintek, DNV GL, Norconsult, Multiconsult and SINTEF in the development of the Aquafarm closed cage system.

The Aquafarm closed cage system has proven to give many advantages; no chemicals required for delousing, improved Feed Factor (FCR), reduced mortality, no escapes, controlled water flow and oxygen saturation, etc.

The new generation of Aquafarm closed cage system is now ready for sale and can be bought or leased, – for more info explore our home page or contact one of our team.

Laks I Merd

Our team

Highly qualified specialists
Egil 00843

Egil Bergersen


T: +47 952 05 452

Roger 00846

Roger Thorsen


T: +47 976 31 448

Atle 00836

Atle Presthaug

Senior Consultant

T: +47 906 34 910

Ole Vegar 1055145

Ole Vegar Moldesæther

Project Manager

T: +47 928 33 385

Mimmi 04284

Mimmi Klingborg

Project Controller

T: +47 915 55 807

Håkon Lund Bondevik

Project Engineer

T: +47 416 685 81

Steinar Matre

Chairman of the Board

T: +47 990 30 708

Per Rune Reime

Financial Manager

T: +47 909 39 777


Tingvegen 74,
N-5555 Førde i Hordaland, Norway