To monitor fish movements in freshwater and detect potential migration barriers, the LifeWatch fish tracking network has been established for long-term observation. This network operates across three habitat types: freshwater, estuarine, and marine environments. In freshwater habitats, acoustic telemetry is employed. Tags transmitting acoustic signals are implanted in the abdomens of fish, and acoustic receivers are placed along rivers and streams to capture these signals. The collected data are stored in the European Tracking Network (ETN) database, which provides users with tools to manage, download, explore, and share telemetry data, along with analytical resources. 

 Many species are being tagged in rivers and streams, including those sensitive to human activities or with limited knowledge of their migration behavior, such as the eel. By gathering long-term datasets, policymakers can be better informed about migration bottlenecks and can plan appropriate solutions, such as constructing fish passages, to address these issues. 

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