Invasive alien species are one of the five major threats to biodiversity. At the scale of the Loire basin, 58 flora taxa (15 of which are aquatic) and 33 fauna taxa (including 25 related to aquatic environments) are recorded. The action of the FCEN focuses on the facilitation of the working group on invasive alien species in the Loire-Bretagne Basin, with the aim of exchanging, improving scientific and technical knowledge, providing feedback and creating shared tools on the management of invasive alien species. This operation is part of action 11 of the ERDF Loire POI “Animating networks of actors”.