Seafarming Systems AS
Kanalsletta 8
N-4033 Stavanger
Norway
Phone: +47 90 42 66 11
Company ID: 918309535
Semi closed cage with abundant water exchange
In 2025 we developed a closed Aquatraz C2 in response to the authorities’ proposed environmental flexibility scheme (“miljøfleks”). 3 off Aquatraz C2 is to be delivered to Lerøy and 3 off to SalMar in Oct-Nov 2026. The Aquatraz C2 is a further development of the Aquatraz S1, which was delivered to Lerøy in 2024. It features a solid steel wall down to a depth of 12 m, followed by a closed membrane (bag), sludge collection, water exchange 2–3 times per hour, and added oxygen. With a budget price of around NOK 1,000/m³, an enclosed volume of 70,000 m³, and a delivery capacity of 50 cages per year, we believe the Aquatraz C2 can contribute to a large-scale transition to more closed production methods. See further data in the table below.
| Farming volume | 60 000 m3 |
| Circumference | 163 m |
| Bio mass | 1500-2000 tonnes |
| Water exchange | 2-3 times per hour |
| Pump effect | 45-60 kW |
| Wave height, Hs | 2,5-3 m |
| Water intake depth | 30-40 m |
Aquatraz is developed by Seafarming Systems for and in cooperation with Salmar under the development licesnes scheme. Four cages was built and placed in production between 2018 til 2020. All four cages have been in full production since delivered with excellent biological and financial results.
Lerøy has also chosen Aquatraz as part of their investments in semi closed technology. The new Aquatraz S1 is a result of learning from Aquatraz G1-G4, and valuable input from Lerøy. It has a top steel structure and a skirt below providing 20 meter of water tight lice protection.
Aquatraz S1 : Lerøy 2023-2024
Aquatraz G1-G4 : Salmar 2018-2021
Photo: Steinar Johansen / Salmar
Aquatraz have documentet exellent lice protection. Comparing production results in Aquatraz with adjacent conventional cages show significant higher margins in Aquatraz. Production cost in Aquatraz accounting for the larger investment was significantly lower than production cost for the adjacent conventional cage. Due to the protection from escape and excellent water exchange the Aquatraz cages have received dispensation from the government to hold twice as many individual fish per cage and increase the density from 25 kg/m3 to 45 kg/m3.