"Contrat de Rivière - RIPARIAS: detection and management of aquatic invasive alien species" is a presence/absence dataset focusing on freshwater invasive alien species in the Senne basin, since spring 2021. data are derived from the monitoring of a set of managed or surveilled water points (ponds, rivers) where the progress/elimination of a set of invasive species is followed up. The dataset includes absence records and should be considered with caution. Each event corresponds to a complete survey of the site in search of a set of targeted IAS. The dataset also include had hoc presence observations of other introduced or native species that are made on site.