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AKVA group Egersund is launching together with Northern Lights Salmon & Sørrollnesfisk and Framo OptiCage a new pen concept against salmon lice. For the first time, the lice skirts developed can be lowered to 15 meters to block the lice out, while pumps bring up fresh, oxygen-rich seawater from the depths.

“We have adopted a special net from AKVA group Egersund Net on the pens. With a spaghetti net with a custom-made lice skirt, where the skirt is attached both at the top and bottom of the net, we can go down to a full 15 meters with lice skirt without experiencing too much deformation,” said Christian Balteskard, Project Manager for Northern Lights Salmon and Sørrollnesfisk.

Utilizes existing infrastructure

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“It is important to look for solutions that are close at hand and to utilize existing infrastructure for sustainable results. We have looked at how we can make changes to adapt and optimize the conditions for the fish. In OptiCage, we have assembled the most optimal solution,” indicated Balteskard.

In the development, the fish farmers together with AKVA group Egersund Net and Framo have looked at how experience and expertise with almost standard products can be used to optimize pen conditions. The testing of the technology is supported by Innovation Norway’s Environmental Technology Scheme.

“The project started in October 2021 and was completed in March 2022. This is an exciting product that means a lot to the concept of deep farming. OptiCage is helping to combat the biggest challenge the fishing industry faces, namely salmon lice. So, when fresh water is constantly pumped in, this gives the salmon better fish health and reduces mortality,” noted Senior Sales Manager Net Products, Geir Kåre Tønnessen, in AKVA group Egersund Net.

Deeper conditions

Therefore, OptiCage is to be used in six 160-meter pens from NOFI at the Ystevika site in Sør-Troms, Norway. There are already salmon in the first four, and the start-up has been very successful.

The goal of OptiCage is to use existing equipment to create a concept against salmon lice. This can be used at many of today’s food fish locations. In the design phase, much of the focus has been on finding practical solutions to ensure simple assembly and safe operation.

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In addition to protecting against salmon lice, the salmon must have good growth and living conditions throughout the cage.

98-minute change of seawater

Framo has used 50 years of pumping expertise from shipping and offshore to help produce sustainable salmon. Together with fish farmers, Framo has worked purposefully to optimize the flow conditions. The powerful water improver Framo AquaStream retrieves fresh seawater at the right temperature from deep below the lice belt. Within 98 minutes, Framo AquaStream has replaced all the water inside the skirt in the pens.

“We have adapted our Framo AquaStream system to verify the technology together with the form-fitting skirt. After successful installation and commissioning, the facility is now in operation with great success,” stated Sales Manager Terje Ljones at Framo Innovation. This ensures that the fish constantly get oxygen-rich water.

“The pumps from Framo create currents in the pen which help to recreate the natural conditions the fish experience out in the sea. The pumps can be run up and down in capacity. Also, the amount of water moved can thus be adapted to the biomass that is in the pen at any given time,” added Ljones.

About Northern Lights Salmon & Sørrollnesfisk

Northern Lights Salmon and Sørrollnesfisk are two family-owned farming companies that have been farming salmon since 1973 and 1984. Both jointly operated since 2001. The joint operation has a total of 7 licenses and 4 locations that are operated through Trollvika Drift.

About AKVA Group Egersund Net

Egersund Net started with the production of nets in the early 1970s and became a separate company in 1996. In autumn 2018, Egersund Net became part of AKVA Group. Egersund Net has developed into one of Europe’s leading suppliers of nets and services to the aquaculture industry. Continuous product development together with customers and partners is emphasized to achieve optimal quality and environmental footprint of our products.

Last summer, AKVA group Land Based A/S, signed a post-smolt RAS contract with Cooke Aquaculture. The Group strengthened its leading position as a land-based technology provider for both smolt/post-smolt and grow-out markets

About Framo

Framo is a Norwegian supplier of pump systems, which is part of the Alfa Laval Group. The company is a fully integrated pump supplier that designs, engineers, manufactures, installs, and maintains pump systems for fluid circulation, sludge collection, and dead fish collection. The company also has expertise in optimizing water logistics and tank hydrodynamics and contributes to optimizing the water flow for fish health and energy optimization.

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