Gyldensten with Algae (IMAGE) University of Southern Denmark Caption In 2015, macroalgae bloomed in the lagoon, feeding on nitrogen from the old farmland. Since 2015, there has been no algae blooms. Credit Sandra W. Thorsen/SDU. Usage Restrictions with credit License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.