Chesapeake Beach MARI Reef Site

The Herring Bay oyster sanctuary near Chesapeake Beach, Maryland, is a pivotal site for oyster restoration in the Chesapeake Bay, exemplifying successful habitat recovery and ecosystem management. Established as part of Maryland’s tributary-scale oyster restoration initiatives, the sanctuary has become a focal point for rebuilding native oyster populations, which have suffered from overharvesting, disease, and habitat degradation over the past century. Early efforts in the sanctuary have combined traditional spat-on-shell planting with innovative reef construction techniques designed to enhance the ecological complexity of the bay.

Key partners in these restoration efforts include the Maryland Department of Natural Resources (DNR), the Chesapeake Bay Foundation (CBF), and the Coastal Conservation Association (CCA) Maryland. Together, these organizations have implemented a variety of strategies, from deploying oyster seed and substrate to creating three-dimensional reef structures that mimic natural oyster beds. These reef structures increase oyster survival and reproduction while providing critical habitat for fish, crabs, and other aquatic species. The oysters’ natural filtration also contributes to improved water quality, supporting the health of the wider estuary.

Building on this foundation, CBF and CCA Maryland have been instrumental in expanding the reef in 2024 and 2025 through the deployment of hundreds of dome-shaped reef balls seeded with juvenile oysters (spat). In 2024 alone, CBF and CCA Maryland deployed 204 reef balls at the sanctuary, contributing to a total of 804 reef balls placed in Maryland waters that year. These structures elevate young oysters above silty bottoms, reduce predation, and create interstitial spaces that attract a diversity of aquatic organisms. Community involvement has been central to the success of these projects, with local volunteers and families participating in planting programs that help restore thousands of oysters each season. Initiatives such as the “Happy Oysters, Healthy Bay” campaign have highlighted the importance of local engagement in sustaining these efforts.

The ongoing work in Herring Bay represents a continuation of broader efforts to restore oyster populations throughout the Chesapeake Bay. Beyond supporting oysters themselves, the sanctuary’s reefs stabilize sediments, improve water clarity, and enhance biodiversity by creating complex habitats for commercially and ecologically important species. These collaborative, science-driven projects demonstrate how careful planning, innovative restoration techniques, and community participation can come together to rebuild vital estuarine habitats and ensure the resilience of the Chesapeake Bay for generations to come.

Want to fish the Chesapeake Beach MARI Reef Site?

Explore the interactive map below to see where the reefs are located, watch oyster reef deployments in action, and dive into the full story of how these habitats are being restored. Check out the videos and StoryMaps below to learn about the people, science, and community efforts behind this thriving ecosystem.

Adding 78 Oyster Reef Balls off the Coast of Chesapeake Beach

An Estimated 200,000 Oysters are Planted in Herring Bay