The SPF workshop was held at the Station Biologique de Roscoff on October 28, 2018. During the day, 13 oral presentations and 6 posters were presented. The topics were very varied and dealt for example with the inclusion of Laminaria forests to the OSPAR list, or the dissipation of excess energy in Chlamydomonas reinhardtii. The General Assembly of the association took place. A tasting of seaweed products was proposed by Scarlette le Corre (Alguerie) and Akira Peters (BezhinRosko).