Pilot Project: Restoration of the Native European Flat Oyster Population
The European flat oyster (Ostrea edulis) was once abundant in the North Sea and coastal waters, including the Wadden Sea. However, due to a combination of overfishing, disease, and harsh winters, flat oyster reefs have disappeared from these areas. As an ecosystem engineer, the flat oyster plays a crucial role in shaping its environment, creating habitats for other marine organisms. Just like existing shellfish reefs, restoring flat oyster populations can contribute to enhancing biodiversity in the Wadden Sea.
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Rediscovery of Wild Flat Oysters: A Starting Point
In 2017, several European flat oysters (Ostrea edulis) were (re)discovered in the Wadden Sea, potentially indicating the early stages of a recovering population. However, the likelihood of natural expansion throughout the Wadden Sea and the timeframe for such a process remain unclear. To explore the potential for facilitating the spread of flat oysters, we conducted a practical study on behalf of the Programma Rijke Waddenzee (PRW) in collaboration with De Goede Vissers from Lauwersoog.
Survival After Reintroduction: A Field Study
The objective of this pilot study was to gain insights into how factors such as water depth, exposure duration, and location influence the survival and growth of flat oysters. To investigate this, locally cultivated oysters were temporarily reintroduced at four different sites in the eastern Wadden Sea under varying conditions.
The results showed that flat oyster survival and growth in the eastern Wadden Sea is possible, even in conditions initially thought to be unsuitable. This study has provided valuable knowledge and experience that will be essential for potential follow-up actions to support further expansion of the flat oyster population.
The full report on this pilot study is available for download on the Programma Rijke Waddenzee website.
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Programma naar een Rijke Waddenzee
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