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Offshore tech could quadruple Scottish aquaculture production
(UNITED KINGDOM, 12/12/2022)
New technology to support seafood production in exposed offshore locations could unlock an additional £4.2 billion in turnover for Scotland's aquaculture sector, following the results of a pioneering research project led by start-up Impact-9 into options for wind turbine sites to double up as salmon farms.
Net9-S Demonstration Platform Design - a sub-scale variant to prove technology and for deployment at existing exposed coastal aquaculture sites. Source: Impact-9
The Impact9 Energy and Marine Ltd. Net9 system– a submersible, floating structure which utilizes the ocean's natural ecosystem and conditions – is one step closer to becoming a commercial reality, with a proven design concept now ready to be tested at scale.
The Net9 system is now ready to be tested at scale
Engineers from Tension Technology International (TTI) and blue economy project developer Simply Blue Group were also involved in the development work, looking at regulatory issues and fish health and welfare as well as the cost challenges associated with bringing aquaculture into open ocean environments.
At full scale, a single Net9 pen could be used to produce up to 2500 tons of salmon per annum, with oxygen-rich waters and conditions that mimic the wild helping the fish to thrive. Impact-9 has identified an opportunity to use the new technology within existing and planned offshore wind energy zones, where a small portion of these zones – around 12 x 12 km – would be enough to house 280 pens and quadruple Scottish production.
The position of wind turbines is typically determined by water depths, currents, and the need to avoid shipping lanes, which are also factors that would influence the suitability of a location for offshore aquaculture.
‘A move further offshore can pave the way for a new sustainable seafood industry of scale, worth billions of pounds in the UK alone. The economic potential is similar to that of offshore wind, however, it will occupy a relatively small amount of ocean real estate and could fit in with existing and planned offshore wind turbine arrays,' said John Fitzgerald, CEO of Impact-9.
‘In the same way that lithium-ion batteries are the key to green transport, we believe that smart flexible structural elements like those used in Net9 will be the enabler of offshore seafood production. The most exciting part of this phase of work was to see the positive cross-over between fish welfare and structural engineering. The potential for stormy weather is of course unavoidable in these environments, but the design of the system allows the net and the fish contained in it to move together with much more flexibility than a rigid structure.’
Source: Impact-9
Impact-9's system uses a flexible structure designed to move with the waves and weather any storms, rather than fighting against the water, reducing the potential stress on fish.
Next year, the research team plans to begin building a unit suitable for technical demonstration at the European Marine Energy Center (EMEC) in Orkney, which will also provide interested producers with an opportunity to see a model of the system in operation.
‘This is part of a systematic engineering approach to address technical novelty and undergo carefully managed tests to qualify that new features will perform as desired,’ said Tom Mackay, engineering manager at TTI.
‘The process is similar to offshore renewable systems development, and we have brought to bear expertise from that sector to help Impact-9 manage the risk of adopting their novel structures in the Net9 application.’
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(UNITED KINGDOM, 12/12/2022)
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‘A move further offshore can pave the way for a new sustainable seafood industry of scale, worth billions of pounds in the UK alone. The economic potential is similar to that of offshore wind, however, it will occupy a relatively small amount of ocean real estate and could fit in with existing and planned offshore wind turbine arrays,'  UK FIS Seafood Media(1).png)
Next year, the research team plans to begin building a unit suitable for technical demonstration at the European Marine Energy Center (EMEC) in Orkney, which will also provide interested producers with an opportunity to see a model of the system in operation.
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