Floating closed-containment fish farms for sustainable and profitable aquaculture. The technology has been verified and commercialized in collaboration with SalMar. Approved for 1,100 MTB.
Talk to our teamThe Marine Donut addresses many of the aquaculture industry’s biggest challenges — and it’s economically sustainable too:
The closed structure prevents fish from escaping, and by drawing water from beneath the lice layer, the system protects against sea lice. This ensures better fish health and significantly reduces costs.
Adjustable water flow creates natural swimming conditions for the fish, improving welfare and the quality of the end product. The design ensures good fish distribution throughout the entire volume — not just at the surface. A full-scale test in autumn 2024 showed only 0.8% mortality.
Marine Donut is equipped with technology that collects uneaten feed and fish sludge, allowing for safe and sustainable handling — instead of releasing it into the fjord.
Advanced sensors and monitoring systems give farmers full control over key parameters such as water quality, oxygen levels, and flow. This ensures optimal farming conditions. Lower mortality, faster growth, better feed conversion, and minimal medication costs translate into strong financial performance.
We make the transition to floating closed containment simple and profitable:
1️⃣ Contact us for a needs assessment
We identify your challenges and requirements to find the best solution.
2️⃣ Tailored technology and project plan
We adapt the Marine Donut to your specific needs, operational conditions, and regulatory requirements.
3️⃣ Construction, implementation, and operation
We deliver, install, and support you through start-up and operations — ensuring your success.
In autumn 2024, SalMar conducted a full-scale test of the Marine Donut facility with 195,000 salmon. The test demonstrated, among other things, a fish mortality rate of just 0.8%. Read more about the test here.
Floating closed containment systems can be used throughout the entire lifecycle of the fish — from post-smolt to market size. However, the best economic performance is achieved by using the system for post-smolt production, from 200 grams to 1.1 kg. The Marine Donut facility is approved for 1,100 MTB, providing capacity for 1 million post-smolt fish.
Once the post-smolt reaches 1.1 kg, it is transferred to traditional net pens or offshore facilities.
The advantage of using floating closed containment for post-smolt is that it significantly reduces the time fish spend in open sea environments. This means lower exposure to diseases, sea lice, and other marine threats — resulting in better fish welfare and improved lice control.
One Marine Donut is used for post-smolt production of 1,000,000 fish up to 1.1 kg. These are then transferred to five Marine Donuts with 200,000 fish each, where they grow to 5.5 kg.
One Marine Donut is used for post-smolt production of 1,000,000 fish up to 1.1 kg. These are then transferred to five conventional net pens with 200,000 fish each, where they grow to 5.5 kg.
In areas with high sea lice pressure, the Marine Donut works well in the final phase, where fish grow from around 2.5 kg to 5.5 kg.
Marine Donuts can also be used throughout the entire production cycle — from smolt to harvest-ready fish.
Marine Donut is a good alternative for producing post-smolt for offshore farming facilities.
Thanks to its flexibility, the Marine Donut also works well as a holding unit.
