A new European Marine Board (EMB) report outlines the main gaps in our knowledge that could prevent the offshore renewable energy sector from developing in a sustainable, equitable and responsible manner.
The new EMB Future Science Brief No. 9 ‘European offshore renewable energy: Towards a sustainable future’ has been launched on April 4th, 2023. The need to decrease carbon emissions urgently and dramatically is high on scientific, political, and societal agendas. Extraction of energy from offshore renewable energy sources is seen as a key measure to achieving this decrease in carbon emission.
To achieve the EU Green Deal vision, the installed offshore renewable energy generating capability in European must increase 30-fold compared to current installed capacity. However, in the rush to develop and install new offshore renewable energy devices across the European sea basins, their potential environmental and societal impacts cannot be ignored. The EMB Future Science Brief highlights which steps need to be taken to ensure that the expansion of this sector is managed sustainably, responsibly and equitably.
The document presents the technical, environmental, and socioeconomic state of the art of the offshore renewable sector, with a focus on European development. It presents the key knowledge, research, and capacity gaps that must be addressed to ensure sustainable delivery of the EU Green Deal and closes with key policy, research, capacity, and data recommendations to take the sector forward.
If you would like to receive hard copies of this publication, please contact info@marineboard.eu and confirm the number of copies and your postal address.
The European Marine Board (EMB) is a leading European think tank in marine science policy. EMB is a network with a membership comprising over 10,000 marine scientists from the major national marine/oceanographic institutes, research funding agencies and national networks of universities from countries across Europe. The Board provides a platform for its member organizations to develop common priorities, to advance marine research, and to bridge the gap between science and policy to meet future marine science challenges and opportunities. The Belgian Federal State is represented in the EMB by the Belgian Science Policy Office (BELSPO) and in the EMB Communications Panel by the Royal Belgian Institute of Natural Sciences (RBINS).
The RBINS expertise on monitoring the environmental impact of offshore wind farms is frequently cited in the new EMB Future Science Brief ‘European offshore renewable energy: Towards a sustainable future’.
It is the year 2035. Extreme weather events such as heavy rainfall, floods and heatwaves have become the new norm all around Europe, and timely ocean information is now critical to respond to the crisis. This is the future scenario that was presented in the foresight workshop titled “Ensuring accurate climate related predictions in Europe by 2035”. The European Marine Board, supported by the EuroSea Innovation Action, organized this foresight workshop on 15-16 March 2023 at the Museum of Natural Sciences (Royal Belgian Institute of Natural Sciences) in Brussels (Belgium).
After the scene was set for the discussions by the President of the Working Party on Maritime Issues Mattias Rust, who is the representative from the Swedish Presidency of the Council of the EU, the foresight workshop discussions started with the scenario of what the world might look like in 2035. A world in which “extreme” events across Europe such as heavy rainfall, floods and heatwaves, have become frequent and the new norm. Responding to the huge costs for the EU’s blue economy and number of deaths that year, the European Commission, in collaboration with the National Governments, have set up a mechanism to discuss and identify pathways to ensure the sustained delivery of accessible, timely, and actionable information from the European Ocean Observing and Forecasting System to respond to the crisis. The workshop was animated by four discussants who described the legal barriers to ocean observing (Erik van Doorn, GEOMAR), funding challenges (Vicente Fernández, EuroGOOS and Ed Hill, NOC) and the societal value of ocean observing (Emma Heslop, GOOS).
These topics were used to describe three 2035 future scenarios: the worst case, the best case, and the probable 2035 future. The participants considered what a best-case scenario could deliver and what could be lost in a worst-case scenario. The participants also considered what needs to happen to arrive at the best-case scenario, and what possible steps are needed to ensure that we get there. The action and barriers that stand in the way of a strong and fit future European Ocean Observing System were discussed and the workshop ended with a discussion on how the EOOS Framework Strategy and Roadmap for Implementation for 2023-2027 could ensure that we arrive at the best possible future.
The outcomes of this workshop are key recommendations for mechanisms to sustainably fund and coordinate Ocean observation, prediction, and information delivery in Europe. These will inform the Framework of the European Ocean Observing System (EOOS) as part of the EuroSea project.
In their latest annual report, the scientists that monitor the environmental impact of offshore wind farms in the Belgian part of the North Sea focus on the continued development of the programme and on the upgrade in anticipation of the wind energy capacity expansion in our waters. Notable results include that no meaningful impact of wind farms was found on the abundance of invertebrate and fish species that live on the sandy seafloor (no negative impact), that communities of organisms that live above the seafloor were enriched in wind farms (positive impact) and that species distribution models now allow to quantify the numbers of seabirds expected to be impacted by wind farm displacement (scale of impact depending on the species, with the highest sensitivity outside existing and future wind farms). Furthermore, insights around promoting the artificial reef effect and mitigating the collision risk to birds and disturbance from construction works on porpoises continue to develop.
Since the end of 2020, the number of offshore wind turbines and their combined capacity has remained unchanged in the Belgian part of the North Sea. At that time, 12 years of construction in the first Belgian marine area for renewable energy came to an end, with eight wind farms totalling 399 turbines in a zone of 238 km² along the border with the Dutch waters. Together, they account for an installed capacity of 2.26 Gigawatts (GW) and an average annual production of 8 TWh, representing around a third of the gross electricity production from renewable energy sources in Belgium.
As ‘Blue Economy’ matures to a sustainable blue economy, it has been tasked with ensuring the environmental sustainability of human activities. Therefore, the impact monitoring program WinMon.BE generates baseline ecological information in the Belgian offshore renewable energy zone since the start of the construction in 2005 at various spatial and temporal scales. Its two-fold aim is to quantify both the anticipated and unanticipated impacts and to understand the cause-effect relationships behind a selection of these ecological impacts. The knowledge gained so far has served the fine-tuning of offshore wind farm construction and operation practices, and thus helped to ensure the environmental sustainability of offshore wind energy production in the Belgian part of the North Sea. All scientific reports of the WinMon.BE monitoring are publicly available.
Preparing for an expansion
To meet the EU objective of reaching net-zero greenhouse gas emissions by 2050, our country aims to add an installed capacity of 3.15 to 3.5 GW by realising offshore wind farms in a second area for renewable energy – the Princess Elisabeth Zone (285 km²) – that is designated in the national marine spatial plan 2020-2026. It goes without saying that the knowledge gained by WinMon.BE will also serve an environment-friendly design and operation of the future offshore wind farms in the Princess Elisabeth Zone.
Zones for renewable energy, including offshore wind farms, in the Belgian part of the North Sea. Eastern zone = first phase that is completely operational, western zone (Hinder North, Hinder South and Fairybank) = Princess Elisabeth Zone (source: Marine Spatial Plan 2020-2026).
However, Belgium is not the only country that further develops the production of offshore wind energy in the southern North Sea. Next to the 523 km² reserved for operational and planned offshore wind farms in the Belgian part of the North Sea, 344 km² are foreseen in the adjacent Dutch Borssele zone, and 122 km² in the French Dunkerque zone. The international expansion also affects the monitoring programme.
Steven Degraer (Royal Belgian Institute of Natural Sciences/MARECO), coordinator of the WinMon.BE consortium : “As potential cumulative ecological impacts of the growing number of offshore wind farms in the southern North Sea are a major concern, detecting and understanding these becomes an important additional challenge for WinMon.BE. We also need to internationalise cooperation across the wider North Sea region, where country boundaries have tended to hamper a regional approach.”
To get ready for the monitoring of the environmental impacts of the expanding offshore wind energy sector in the Belgian part of the North Sea, the WinMon.BE 2022 report touches upon new insights into spatial distribution patterns of invertebrates and fish, the identification of areas where seabirds are most sensitive to offshore wind farms and, ‘promoting the good’ (artificial hard substrate fouling communities), and ‘mitigating the bad’ (seabird collisions and noise pollution for porpoises). The report is based on data collected up to 2021.
Spatial distribution patterns & sensitive areas
On the seafloor – epibenthos & demersal fish (ILVO)
To detect and understand potential spillover effects of the existing offshore wind farms and for the assessment of the potential impacts of the future offshore renewables zone, one must first document and understand the pre-construction situation. With respect to the distribution and abundance of epibenthos (invertebrates that live on the surface of the seabed, such as certain mollusks, crustaceans and squid species) and bottom-dwelling fish, a community analysis on abundance data was therefore conducted for the entire Belgian part of the North Sea.
It was found that both epibenthos and fish communities largely follow similar spatial distribution patterns with a clear distinction between the coastal and the offshore area. Within the coastal area, two different communities inhabit muddy and sandy sediments respectively. The offshore communities are additionally structured by sand bank topography. The existing offshore renewables zone largely overlaps with the spatial distribution of the offshore epibenthos and fish communities, for which monitoring in between the turbines did not show meaningful impacts of the wind farms.
Above the seafloor – hyperbenthos (Ghent University)
The WinMon.BE monitoring program for the first time shed a light on the hyperbenthos ecosystem component. This community consists of organisms that inhabit the water column immediately above the seafloor, including a large variety of small crustaceans and worm-like species, jellyfish-like life stages of hydrozoans, and larval life stages of larger crustaceans and fish. The impact of turbine presence (artificial reef effect) and the ceasing of fishery activities (fisheries exclusion effect) are expected to result in enriched hyperbenthic communities within the offshore wind farms. To test this, samples collected inside and outside two Belgian offshore wind farms, each with specific local habitat conditions, foundation type, construction times and at different distances to the coast, were compared.
While hyperbenthos communities at different distances to the coast appeared to differ in species composition (with more species of nearshore areas closer to the coast) and density (with higher densities closer to the coast), the densities were consistently higher in the wind farms compared to the corresponding control sites outside the wind farms. Differences in species richness (higher in the wind farm) and community structure were also observed at greater distance to the coast. These results corroborate the enrichment hypothesis. No differences in species richness and community structure were observed closer to the coast.
For seabirds, detailed knowledge on distribution patterns is important to design adequate monitoring programs and to gain insights into area-specific sensitivity of different species to offshore wind farms. Based on seabird counts from ships, collected across the Belgian part of the North Sea in the period 2000-2018, species distribution models were created to feed into a sensitivity map regarding offshore wind farm development, and an integrated displacement sensitivity index based on their cumulative occurrence was proposed. Data were used for four seabird species known to be sensitive to wind farm-induced displacement: red-throated diver Gavia stellata, northern gannet Morus bassanus, common guillemot Uria aalge and razorbill Alca torda.
The species distribution models allow to quantify the numbers of seabirds expected to be impacted by wind farm displacement. In absolute numbers, common guillemot is the most impacted species, with about 1600 individuals being displaced by the existing and future offshore renewables zones. One area was highlighted as particularly sensitive to offshore wind farm development, situated in front of the western part of the Belgian coast between 5 and 12 nautical miles offshore. This is well outside all existing and future Belgian wind farms.
Previous studies have shown that foundations of offshore wind turbines are colonised by a wide array of fouling species (the artificial reef effect). Dominant species at the various stages of the colonisation process include the anemone Metridium senile, the blue mussel Mytilus edulis, and the crustacean Jassa herdmani. As a result of this colonisation the biomass on the foundation can be up to 35 times higher compared to the surrounding soft sediments. However, this higher biomass can influence local food web dynamics, and there is also concern over the establishment of non-indigenous species. To better understand the potential effects of large-scale colonisation on offshore wind turbines by fouling species, the fouling communities on the turbine foundations were compared to those on longer-existing artificial hard structures, in casu shipwrecks.
The results showed that shipwrecks had a higher species richness compared to offshore wind farms (165 vs 114 species). Furthermore, the species present on the two types of artificial hard substrates were also different, with shipwrecks holding 95 unique fouling species compared to 44 on offshore wind farms. These differences in species diversity can be attributed to the older age and the higher structural complexity of shipwrecks. By increasing the complexity of the scour protection layer surrounding turbine foundations it might be possible to increase the species richness of the fouling community. This is often considered an asset of offshore wind farms.
Because wind turbines at sea have a relatively short life span, repowering scenarios are already being discussed for the oldest wind farms. Ongoing technological developments result in larger wind turbines and an increased open airspace between turbines. In anticipation of this, the seabird collision risk – a prominent and longstanding issue with offshore wind farms – was assessed for a hypothetical repowering scenario of the first offshore wind farm zone in Belgian waters. For all considered bird species, the estimated collision risk decreased (40% reduction on average for 15 MW turbines) because of the higher clearance between the lower tip of the rotor and the sea level, and the need for a lower number of turbines per km². Increasing the hub height of the turbines with 10 m further decreased the expected number of seabird collisions with another 37% on average.
As such, turbine size can offer an opportunity to mitigate seabird fatalities. For terrestrial birds and bats that also migrate at sea, the effect of larger turbines is less clear. It is likely that curtailment strategies, which stop the turbines during heavy migration events, will still be needed to reduce the impact on these groups.
A second prominent and long-standing issue with offshore wind farms is the disturbance of marine mammals during pile driving activities, producing excessive impulsive sound levels. Based on passive acoustic monitoring datasets from 2018 to 2020, including the construction periods of three offshore wind farms, it was shown that harbour porpoises Phocoena phocoena respond to pile driving over a period of hours to days. Detection rates of porpoises reduced up to 20 km from the pile driving location, with the magnitude and duration of the reduction decreasing markedly with increasing distance.
The use of sound mitigation had significant effects on the spatial and temporal extent of avoidance of the construction area by porpoises, but the reduction in porpoise detection rates appears to start even prior to the pile driving in the immediate vicinity of the construction site. This suggests that efforts to reduce the impact of underwater noise generated by future offshore wind farm construction on marine life should aim to limit not only the generated noise levels but also the overall duration of the construction.
Steven Degraer: “In conclusion, a continued effort to gain more knowledge is not only needed for the further follow-up of the impact of the wind farms that have already been constructed, but also for fine-tuning an environment-friendly design and operation of future offshore wind farms. Substantial progress has been made and has proved to be applicable for a sound management of offshore renewable energy. However, many unknowns remain to be tackled.”
Some examples of how these ongoing efforts will translate into practice include a continued and finer focus on the invertebrate and fish communities of the seafloor (particularly relevant in the less surveyed second offshore renewables zone), increased sampling efforts to enhance the ability to fully characterize hyperbenthos communities and strengthen the statistical power to detect offshore wind farm-related impacts, and further finetuning of the seabird modelling process, taking additional seabird species and anthropogenic pressures into account to ultimately inform the marine spatial planning process. Where necessary, mitigation measures need to continue to be designed and applied as the monitoring programme yields new insights.
The Monitoring Programme WinMon.BE is a cooperation between the Royal Belgian Institute of Natural Sciences (RBINS), the Research Institute for Nature and Forest (INBO), the Research Institute for Agriculture, Fisheries and Food (ILVO) and the Marine Biology Research Group of Ghent University, and is coordinated by the Marine Ecology and Management team (MARECO) of the Royal Belgian Institute of Natural Sciences.
WinMon.BE is commissioned by the Federal Government as part of the environmental permit conditions for offshore wind farms. For the monitoring, use was made of the research vessel Belgica (ship time on RV Belgica was made available by BELSPO and RBINS – OD Nature), the research vessel Simon Stevin (operated by the Flanders Marine Institute), several private vessels, the Belgian scientific diving team and the observation aircraft of RBINS.
In the framework of the Belgian presidency of the European Coast Guard Functions Forum (ECGFF), Frontex and the Belgian Maritime and River Police, assisted by the Coast Guard Secretariat, organised a workshop from February 28th till March 2nd. With approximately 100 participants from different European countries, interesting presentations, a panel discussion and numerous opportunities to exchange expertise and to network, it can be considered a very successful first edition of the workshops.
Cooperation: the key to success
Over the course of three days, the participants worked on the theme ‘Enhancing cross-sector and cross-border synergies’. The main objective was to share expertise on maritime security, multifunctional operations and building operational synergies, whilst also looking ahead to potential future collaborations. The 15 speakers from various European member states cited many examples of partnerships that are rendering valuable benefits, both across borders and services. Once again, cooperation proves to be the key to success.
Three main themes
The workshop addressed three major themes that are highly topical in the field of maritime ‘Safety’ and ‘Security’.
The first theme consisted of maritime surveillance. Examples of synergies in maritime surveillance were explained. The various successful operations in cooperation with FRONTEX were reviewed, and in addition attention was given to the formalisation of the partnership between MAOC-N (Maritime Analysis and Operations Centre – Narcotics), Belgium and many European member states. The Belgian MAOC-N membership is an important step in the optimization of information exchange on drug trafficking and smuggling. Furthermore, the security role of the Belgian Maritime Security Centre (MIK) in monitoring security threats was also discussed in detail.
A second major theme was joint, multifunctional operations. In today’s world, it is vital to organise operations across borders and services and build partnerships, thus mutually reinforcing each other. EFCA, EMSA and FRONTEX exchanged views on this topic during a discussion panel. Moreover, participants zoomed in on collaborative partnerships in the law enforcement process of irregular migration.
The third part of the workshop was centered on the future. A whole range of opportunities and challenges were discussed. For instance, how technological developments can help with underwater imaging and how adapted legal frameworks are being developed to ensure efficient monitoring of critical infrastructure such as wind farms, submarine data cables and pipelines.
The Coast Guard is a unique Belgian organisation that pools and coordinates the expertise of 17 partners in the maritime sector to ensure safety and security at sea. Partners also include the Scientific Service ‘Management Unit of the Mathematical Model of the North Sea (MUMM)’, part of the Royal Belgian Institute of Natural Sciences (RBINS).
In 2022-2023, the Belgian Coast Guard chairs the European Coast Guard Functions Forum (ECGFF). Together with the European agencies FRONTEX, EMSA and EFCA, it will organise a number of workshops during the year. In cooperation with DG Mare of the European Commission, it will also organise a Cybersecurity Working Group and the summit taking place at the end of September 2023.
From 20 February to 4 March, the very last BBNJ negotiations, aimed at adopting an international treaty for the protection of biodiversity on the high seas, took place in New York. The agreement was reached after 17 years of intense discussions and negotiations at the United Nations. Belgium played an active role in drafting and finalising this historic treaty. Among other things, it will now become possible to create marine protected areas on the high seas – outside territorial waters.
The new treaty is of great importance for Belgium, as our country is a founder of the Blue Leaders in 2019 and a strong supporter of ocean protection and the conservation of its resources. The adoption of the target of protecting 30% of the ocean by 2030 at the COP Biodiversity in Montreal in December last year was a first important step. The conclusion of this new Convention for the Protection of Biodiversity on the High Seas (BBNJ – Biodiversity Beyond National Jurisdiction) is the second and final step before effective protection can be achieved.
The importance of the ocean
The ocean is crucial for sustaining life on Earth. It is the source of food and energy for millions of people, regulates the climate and provides oxygen. Unfortunately, the ocean is threatened by pollution, overfishing, climate change and other human activities.
Protecting our ocean is therefore essential for the future of the planet. One of the main reasons is the unique role the ocean plays in the fight against climate change. For instance, it absorbs about a third of the CO2 emitted into the atmosphere by human activities. This helps to reduce global warming and to stabilise the climate.
Vincent Van Quickenborne, Minister for the North Sea: “This is a historic treaty. A crucial step for all those who care about the ocean. The BBNJ treaty for the ocean is what the 2015 Paris Agreement is for the climate. After more than 17 years of negotiations, we can finally create marine protected areas on the high seas.”
The importance of nature reserves on the high seas
The new BBNJ treaty was to be created to delineate protected areas (nature reserves) on the high seas. 70% of the earth’s surface consists of water of which 3/4 is high seas which currently could not be fully protected in any way by the international community.
Thanks to this treaty, the final step has been taken to transform 30% of the high seas into marine protected areas by 2030. These are zones in which human activities are very strictly regulated: sustainable shipping, sustainable water tourism, sustainable use of biotic (fish stocks and other marine organisms) and abiotic (sand, gravel, metals, etc.) resources, scientific research with respect for nature.
Scientists agree that at least 30% must be protected with the establishment of natural areas on the high seas to have a resilient ocean that impacts climate change. With 30%, you reach the tipping point to keep the other 70% habitable as well.
Sophie Mirgaux, Belgian Special Envoy for the Ocean, FPS Public Health, who has been following the negotiations since the beginning as a member of the EU negotiating team: “This treaty is truly a gamechanger for ocean protection. It will be a challenge to effectively deliver this protection in an area so far from the coast. You need a lot of capacity to do that and it will be a long-term work. But it is necessary, so we must go for it as an international community.”
Besides natural areas on the high seas, the treaty also talks about access to marine genetic resources and the fair sharing of benefits derived from them, environmental impact assessments of activities on the high seas, capacity building and marine technology transfer. Like the climate treaty, the new treaty will also organise a COP ‘Conference of the Parties’.
Role of Belgium
Our country worked actively for the success of the BBNJ negotiations, including through active participation in the process and through bilateral contacts with other countries. The Royal Belgian Institute of Natural Sciences also cooperated intensively: as a member of the Belgian delegation as well as the EU team, Hendrik Segers was involved in drafting the Belgian and EU positions, and was responsible for aspects concerning marine genetic resources. The importance of finalising the BBNJ Treaty was also underlined during the Blue Leaders event that Minister for the North Sea Vincent Van Quickenborne co-organised on the eve of the Our Ocean Conference 2023 in Panama. Policymakers from around the world called there for the finalisation of the BBNJ treaty.
The high-level appeal was bolstered by the announcement of more than $100 million in funding to support ratification and implementation of the treaty. The funding pledge was made possible by private and public philanthropic institutions such as Bloomberg Philanthropies, the Global Environment Facility (GEF), Oceans5 and others. The European Commission has also pledged €40 million to the BBNJ treaty. In addition, the Commission provides €816 million for ocean research.
As Blue Leader, Belgium will throw its weight behind the idea of quickly fixing the first nature reserve on the high seas. To make this possible, however, some steps still need to be taken.
Hendrik Segers, Royal Belgian Institute of Natural Sciences, explains: “In order to proceed to the delineation of marine protected zones in areas outside national jurisdiction, the BBNJ treaty must first be ratified by EU member states and the Commission, and transposed into national and European legislation. It will also be important for scientific research on the high seas to fully understand the consequences of the treaty.”
Belgium candidate for secretariat in Brussels
As is the case for other international conventions, a secretariat will also be established for BBNJ. This will be a separate secretariat, i.e. not under the UN umbrella in New York. This is important to give the new treaty clout. After all, there will be an important lobby against establishing protected areas on the high seas. A separate secretariat, with its own staff and budget, can then make a real fist. Belgium, one of the founders of Blue Leaders, is applying to set up that important secretariat in Brussels. This is not only in line with our country’s commitment in recent years but would also significantly raise Belgium’s international marine standing.
Elia Asset nv has submitted an application for an authorization for the construction and a permit for the operation of the “Modular Offshore Grid 2 (MOG2)” in the Belgian part of the North Sea This application is subject to an environmental impact assessment procedure. The application, the environmental impact statement and the non-technical summary can be consulted from 8 February to 10 March 2023 at the offices of MUMM at Brussels (Vautierstraat 29, 1000 Brussels; mdevolder@naturalsciences.be; tel 02 627 43 52) or at Ostend (3de en 23ste Linieregimentsplein, 8400 Ostend; jhaelters@naturalsciences.be; tel. 02 788 77 22), by appointment only and during office hours between 9:00 am and 5:00 pm. The application can also be consulted at every coastal community, during office hours. The list of locations and contact persons of coastal communities is available by simple request to MUMM/BMM/UGMM.
On Thursday 15 December, the ceremonial presentation of the Blue Innovation Awards 2022 took place at the Port House in Antwerp. The Belgian Pilot of the UNITED project won the Blue Innovation Swell Award. Within this demonstration project, the Royal Belgian Institute of Natural Sciences is working with scientific and commercial partners to optimise the combination of offshore wind, aquaculture and recovery of flat oysters and seaweed cultivation.
Project partners of the Belgian demonstration project within UNITED (Image: UNITED)
Blue Innovation Awards
The Blue Innovation Awards are an initiative of the Blauwe Cluster to highlight innovative projects, products and services in the blue economy. Four categories are awarded: the Blue Innovation Wave for SMEs, the Corporate Blue Innovation Wave for large companies, the Blue Innovation Swell for collaborative initiatives and the Blue Innovation Captain for government initiatives. A public prize will also be awarded.
This was already the third edition of the Blue Innovation Awards in 2022. All entries, involving over 50 organisations in total, were judged on five criteria: innovative character; link with economic activities in, on and by the sea; market potential; international ambitions and appeal; and link with the United Nations’ sustainable development goals. Within each category, two nominees were eventually retained.
The laureates of the four Blue Innovation Awards 2022 (Image: Blauwe Cluster)
UNITED
The EU Horizon2020 project UNITED (Multi-Use offshore platforms demoNstrators for boostIng cost-effecTive and Eco-friendly production in sustainable marine activities) provides evidence of the economic as well as environmental viability of multiple use of offshore space through the development of five demonstration projects in different European sea areas.
The Belgian demonstration project revolves around the combination of offshore wind energy, cultivation of seaweed (Saccharina latissima) and European flat oysters (Ostrea edulis), and restoration of flat oyster reefs. It is a collaboration between several research groups from Ghent University, Jan De Nul, Brevisco, Colruyt, the Royal Belgian Institute of Natural Sciences (RBINS) and Parkwind. The RBINS research group MARECO is mainly focusing on the restoration of flat oyster reefs, and is also responsible for developing a framework for assessing the added value of multiple marine use, which will be applied in the five pilot projects.
“The election of the Belgian UNITED-pilot as laureate of the Blue Innovation Swell Award 2022 shows that the blue economy is very much alive, and that nature development is also becoming an increasingly entrenched condition within economic activities.” says MARECO researcher Annaïk Van Gerven proudly.
UNITED laureates of the Blue Innovation Swell Award 2022 (Image: Blauwe Cluster)
More information about the other Blue Innovation Awards 2022 can be found on the Blauwe Cluster website.
The spatial combination of a sea farm – where mussels, oysters and seaweed grow – and passive fishing with innovative baiting techniques has been extensively tested off our coast in the past three years. That it succeeds is good news, because both activities, unlike traditional (active) beam trawling, are allowed in wind farm zones. Light, sound and smell appear to be successful techniques for catching more cuttlefish, shrimp and fish on the bottom of a multi-species sea farm. Additionally, tools have been developed that allow sea farm operators to better plan sea trips. The results of the VLAIO and Blue Cluster project SYMAPA were presented to press and stakeholders on 24 November 2022 in Ostend by project partners Colruyt Group, Brevisco, AtSeaNova, Flemish Fish Auction, the Institute for Agricultural, Fisheries and Food Research (ILVO) and the Royal Belgian Institute of Natural Sciences (RBINS).
North Sea Minister Vincent Van Quickenbornewas there: “We are going to develop the Belgian part of the North Sea as the powerhouse of our country and as an engine of innovation and self-sufficiency. Therefore, in addition to wind farms and floating solar panels, we also want to cultivate seaweed in the North Sea to make biofuel. For this we have allocated 250,000 euros of research money. In the wind farms we can produce food in addition to energy. We import 70% of our marine food in Europe, which illustrates that there is still a lot of potential in our country for mariculture and passive fishing. Proteins extracted in this way from seaweed or shellfish no longer need to be produced through animal husbandry or fishing. The results of the SYMAPA project show that important steps have been taken to make it not only technically and biologically but also economically feasible to combine not one, but two or even three activities in the same North Sea zone.”
Schematic representation of pot fishing on the seabed (image: ILVO)
10 Times More Cuttlefish in Pots with Fluorescent Fibers
In passive “pot fishing”, fish and other marine animals are lured to and caught in pots on the bottom of the sea. This form of selective fishing has little bycatch, little to no bottom impact and little fuel consumption. The pots are emptied regularly and the catch is alive when collected on board, which improves quality.
Fishing capacity can also be optimized through the use of light, sound and, potentially, smell. This is evident from trials conducted by ILVO in the Westdiep zone off the coast of Nieuwpoort:
The results for cuttlefish are impressive: by replacing the net of a standard cuttlefish pot with a fluorescent type of fibers, the scientists caught 10 times more cuttlefish.
Other techniques that significantly increased catches were the use of LED lights in pots for gray and sturgeon shrimp, sounds of eating in pots for roundfish and the smell of banana in pots for flatfish.
Mattias Van Opstal and Jasper Van Vlasselaer (ILVO):“The study provided a toolkit of innovative techniques that fishermen can use to increase catch in pots. Depending on the spot in the sea and the species present there, one or the other baiting technique will be more interesting to them.”
Passive Catches Score Well on Quality and Taste
SYMAPA partner Vlaamse Visveiling (Flemish Fish Auction) is already satisfied with the quality of the passive capture strategy. Sylvie Becaus (Vlaamse Visveiling): “Not only were we getting more cuttlefish in – a commercially interesting species – the quality of the products was also excellent: extremely fresh and not bruised.”
Tests in the taste lab of the Food Pilot of ILVO and Flanders’ FOOD in Melle confirmed this difference in quality: passively caught cuttlefish received better scores from the professionally trained taste panel than cuttlefish landed as bycatch in beam trawling.
Smart Aquafarming
The North Sea is a well-monitored ecosystem. RBINS but also ILVO and several European partners collect data to monitor the health of fish stocks and of the wider marine ecosystem. RBINS also designed useful tools for planning sea trips. A platform for five-day marine forecasts on tides, wind speeds, wave height, etc., was already in place (the Marine Forecasting Centre), but thanks to SYMAPA and the EU-H2020 FORCOAST-project there is now also a modelling tool to predict the best period for the installation of splash collectors. With those devices, cultivators collect stray seeds of mussels and oysters for subsequent rearing. Too-early placement can cause the nuisance of fouling; too-late placement can ruin the harvest.
Léo Barbut and Geneviève Lacroix (RBINS):“Thanks to these modeling tools, we are another step closer to smart aquafarming. Operators of marine farms can use data to plan when to go to sea for maintenance of their facilities, for seed collection and ultimately for harvesting.”
Mussel Culture and Facilities Optimized
A previous project Edulis already successfully cultivated mussels between wind farms 30 to 50 km from the Belgian coast. SYMAPA coordinator Brevisco also demonstrated in the privately funded Nearshore Mussel project that large-scale mussel farming in the Belgian North Sea is technically and economically feasible. The Belgian “blue mussel” is larger and meatier (40-45% meat values) than the Zeeland mussel (30-35% meat values). It also grows faster and tastes good. In SYMAPA, the cultivation technique was optimized to the beautiful result of 16 kg of mussels per meter. Thanks to seemingly minor adjustments to the installations, there is now also no damage during storms. The installations have been made to be stable and “North Sea-proof”.
Mussel culture lines are reeled in to control the harvest (image: Brevisco)
High Quality Oysters from the Belgian North Sea
The past project Value@Sea demonstrated that the endangered European flat oyster can be cultivated in the North Sea. In SYMAPA, cultivation techniques were further refined in the Westdiep zone, with varying degrees of success. Quality flat oyster farming near the coast is possible but the rapid growth of unwanted organisms (fouling) on the baskets is a technical obstacle that must be overcome for commercially viable farming. It obstructs the flow of fresh seawater, periodically depriving the oysters of enough nutrients to grow.
Fouling on the oyster baskets (image: Colruyt Group)Quality farmed European flat oysters (image: Colruyt Group)
Colruyt Group remains committed to research to eventually grow flat oysters in the Westdiep zone. Today, Colruyt Group is building our country’s first commercial sea farm there where the first 50 mussel lines of phase 1 will be installed and the first limited harvest is expected in the summer of 2023.
Wannes Voorend (Colruyt Group): “Growing multiple species in a sea farm would allow us to offer a broader pallet of marine products and combining activities also has some operational advantages. The applications in Westdiep Sea Farm are already promising, but we are doing this in a step-by-step approach towards commercial farming.”
Quest for Seaweed Growing Installations that can Resist the North Sea Currents
For seaweed, the natural conditions in the North Sea are an persisting technical challenge. In SYMAPA, both horizontal and vertical structures were tested by partner AtSeaNova. Horizontal structures perform fine on calm waves but in the North Sea the pulling force is too great. That is why they switched to vertical installations with loose suspension lines. It is these structures that are now being further tested in the ongoing EU-H2020 project UNITED.
Useful data for Marine Spatial Plan
The Belgian part of the North Sea is only 3,500 km² but interesting for a variety of activities. Think of mariculture, fishing and energy production but also shipping, sand extraction, recreation, nature and coastal protection. Planning these different activities in the Marine Spatial Plan is a difficult but important puzzle. In the current plan (2020-2026), marine aquaculture is allowed only in the Westdiep and wind farm zones. Passive fishing is also allowed in both, unlike classic beam trawling which is not allowed around the windmills.
Bert Groenendaal (Brevisco), coordinator of SYMAPA: “That synergies between mariculture and passive fishing are possible is a major boost from this project. There is now a toolkit of innovative fishing techniques, mussel farming has been optimized, and there are forecasting models that also make the combination of marine activities more logistically and economically feasible.”
Options for multiple spatial use are an important asset in the Belgian part of the North Sea (image: Marine Spatial Plan 2020-2026)
Article largely based on ILVO press release, 24 November 2022
WE NEED YOU! Share your opinion on the first tests on oyster and seaweed cultivation and oyster reef restoration in the offshore wind farm Belwind, accompanied by a tasty oyster, delicious seaweed products and an active brainstorm.
Multi-use of space at sea. What is it? How can it be applied in the Belgian part of the North Sea? What are the economic and social benefits? What are the expected challenges? The UNITED project has investigated this by conducting a successful test in the offshore wind farm Belwind, studying both oyster and seaweed cultivation and the restoration of oyster reefs. Through an interactive workshop, the first results will be presented and discussed with the general public, with room for questions-andanswers, discussion rounds and the expression of possible expectations and concerns. The workshop is set up in such a way that the morning focuses on the economic aspect and the afternoon on the social aspect. Participants can participate in either or both sessions, and a themed lunch will be provided between both sessions.
09h00 – 09h30 Welcoming and ice breaker exercise – up to you now!
09h30 – 09h45 What is the project UNITED?
09h45 – 09h50 Workshop objectives
09h50 – 10h10 Multi-use in the Belgian Pilot and Business Analysis of the Belgian pilot – lessons learned / What is multi-use and how can we apply it in the Belgian part of the North Sea? / Presenting the business case and main results: the pilot, products and services, key revenues and costs, key messages, etc.
10h10- 10h25 Socio-economic characterization of the pilot
Presenting the main socio-economic activities that will surround the pilot
10h25-10h40 Break
10h40-12h00 Brainstorm on potential economic impacts (positive and negative) of the multi-use activities / A discussion with the stakeholders with focus on:
– Extra elements for the business case.
– The other socio economic activities / impacts that were not considered and their impacts (increase in employment, development in activity, increase in revenue, etc.)
– The missing information (in particular seaweed and aquaculture activities)
– Environment: impact on ecosystem services/marine environment.
12h00–13h30 LUNCH ! Come and taste oysters, seaweed products and delicious sandwiches
AFTERNOON – SOCIAL PART
13h30-13h35 Welcome, Silke Beirens, Schepen Mens & Milieu, Stad Oostende
13h35-13h45 Objectives of the social part of UNITED
Presentation of UNITED and the Belgian pilot (if we have new joiners) / What are the objectives of the social part of the workshop? / What are social impacts?
13h45-14h45 Presentation of scenarios – seaweed farming, oyster farming and oyster reef restoration – inside an offshore wind farm: identification of possible social impact. Several options will be presented:
– Each activity in a separate sea area (no multi-use of space)
– Wind farm combined with one other activity (seaweed farming, oyster farming or oyster reef restoration)
– Wind farm combined with several other activities: oysters and seaweed / aquaculture and nature restoration
14h45-15h45 Ranking of previously identified social impacts / assessment of acceptability / potential optimisation of solutions
15h45-16h00 Closing remarks, brief conclusion from both parts
16h00-16h30 Closing drink
10:00 – 10:30 “Towards autonomous monitoring of fish diversity in the North Sea” – Prof. Sofie Derycke (ILVO Marine, Marine Genomics Unit, Flanders Research Institute for Agriculture, Fisheries and Food & Dpt. Of Biology, Ghent University, Belgium)
10:30 – 11:10 Coffee break
11:10 – 11:40 “Invertebrate-derived DNA (iDNA) for biomonitoring and pathogen surveillance” – Dr. Jan Gogarten (Applied Zoology and Nature Conservation, University of Greifswald and the Helmholtz Institute for One Health, Germany)
11:40 – 12:10 “Monitoring terrestrial mammals via aquatic eDNA in savannah systems” – Dr. Tamara Schenekar (University of Graz, Austria)
12:10 – 14:00 Lunch break
14:00 – 14:30 “The power of eDNA-based methods for fish and amphibian communities in freshwater environments” – Prof. Rein Brys (Research Institute for Nature and Forest & Terrestrial Ecology Unit, University of Ghent, Belgium)
14:30 – 15:00 “Improving whole biodiversity monitoring with eDNA metagenomics” – Prof. Hugo Gante (Royal Museum for Central Africa & KULeuven, Belgium)
