Digital Knowledge System

Oyster Reef Restoration

Borkum Reef Ground, Germany

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Driving Factors and Motivations

The European flat oyster used to provide essential ecosystem services such as water filtration, habitat provision, and shoreline stabilization. Due to overfishing, habitat destruction, and diseases, the species became functionally extinct in the German North Sea by the early 20th century. The restoration actions are motivated by the need to recover these lost ecosystem functions, enhance biodiversity, and contribute to climate resilience.

Aims of restoration efforts: Develop scalable, science-based methods to restore self-sustaining Ostrea edulis reefs and support marine restoration tools, best practices, and coastal policy across Europe.

Objective

To restore self-sustaining and reproductively viable populations of Ostrea edulis in the German North Sea.

Implementation

  • 1)

    Deploy the reef base and complete related underwater construction works.

  • 2)

    Place Ostrea edulis shells on top of reefs with divers to create potential settlement substrate.

  • 3)

    Introduce live oysters onto installed reefs using divers.