Timeseries of environmental and sluice operation data for adjusted tidal barrier management (aangepast spuibeheer) to promote upstream glass eel migration in Flanders (Belgium)

The European eel (Anguilla anguilla L.) population has experienced a severe decline in recent decades, with restricted upstream migration of glass eels identified as a major contributing factor. In Flanders, glass eel potential entries are located at the IJzer (Nieuwpoort), the “Sas Slijkens” sluice complex (Ghent-Ostend Canal), and the complex in Zeebrugge (Afleidingskanaal van de Leie and Leopoldkanaal). To facilitate migration, adjusted tidal barrier management - slightly opening sluice gates during incoming tide - was evaluated between 2016 and 2025. This dataset contains monitoring results of electrical conductivity, discharge and precipitation and sluice management practices at these sites, providing insight into the effectiveness of adjusted sluicing measures and the trade-off between eel migration opportunities and salinization risks.

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