The Monitoring of invasive alien crayfishes in the Flemish part of the LIFE RIPARIAS areas is an event dataset published by Agency for nature and forests (Flemish government, Belgium). The data are collected from targeted monitoring on ponds within the nature areas managed by the Agency for nature and forests, in the summer of 2022. Only invasive species are presented in this dataset. The data are published as a standardized Darwin Core Archive and includes for each occurrence record an occurrenceID, date, location, quantification and scientific name. Issues with the dataset can be reported at https://github.com/riparias/anb-crayfishes-occurrences/issues We have released this dataset to the public domain under a Creative Commons Attribution License. We would appreciate it if you follow the INBO norms for data use (https://www.inbo.be/en/norms-data-use) when using the data. If you have any questions regarding this dataset, don't hesitate to contact us via the contact information provided in the metadata or via opendata@inbo.be.