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 m 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.

Innside merd


The closed cage from Aquafarm Equipment AS uses the lightweight material GRP with local reinforcements of high tensile steel. GRP has been proven to be an excellent material for fish farming and is used in many tanks for smolt. We have taken this line of thinking a large step further and made a floating cage.

The design consists of several elements fixed together with specially designed joints. This makes both transport and installation easy and affordable.

The size, thickness and geometry of the elements are shaped to give an optimal strength to weight ratio.

Neptun has now been tested for well over a year and proven to meet all the criteria’s we defined in the design.

Technical Data:

  • Inside diameter: ø40 m
  • Circumference: 126 m
  • Cage Depth: 22 m
  • Gross Volume: 21.000 m3
  • Significant Wave Height: Hs = 1,0 m
  • Max Wave Height: HMax = 1,8 m
  • Design Wind : v = 30 m/s (Severe Storm)
  • Current: 0,75 m/s
  • Lifetime: 25 years
  • Certified design and construction according to NS9415:2009 and NYTEK

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