Last month saw the second annual symposium of the Polymers & Oceans Scientific Research Group. Created in 2019 under the direction of the French National Council for Scientific Research (CNRS), in partnership with the French Institute for Marine Research (Ifremer) and the National Health and Environment Agency (ANSES), it brings together 215 researchers from 45 different French-speaking laboratories. Its members, whose aim is to carry out a comprehensive and multidisciplinary study of the evolution and impacts of plastics in aquatic environments, have just presented their latest results, focusing in particular on the discovery of what could be called a "plastisphere".