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Danish Anholt Pilot Update

The Technical University of Denmark commenced a seaweed cultivation trial at the pilot site Ørsted windfarm near the Island of Anholt, Denmark, 29th September 2023. Two horizontal longlines of 100 meters length was established and submerged 5 meters below sea surface using concrete blocks (40 kg each) every 10-20 meters on the bottom. Both longlines were shown to cope with the rough weather conditions at this off-shore site. Some of the yellow Aton corner buoys was displaced during harsh weather but will be re-installed in spring. The deployed seaweed lines with sugar kelp (Saccharina lattisma) and dulse (Palmaria palmata) was inspected by using remotely operated vehicle (ROV) video recordings when weather windows occurred during the past winter period. This is the first out of two planned growth seasons for seaweed cultivation testing at this Danish pilot site. The focus of the first growth season is to assess the growth performance by using different deployment configurations (horizontal vs vertical) and using growth substrates with different thicknesses (rope and twine). This will be evaluated after the sampling in May 2024. The preliminary observations show that sugar kelp grows better in the top part of the longline system (5-6 meters below sea surface) compared to deeper parts since the autumn deployment. Due to strong water current conditions at inspection the ROV recording to get video of all the seaweed lines why there is no recordings of Palmaria lines. 

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