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Restaurant Scraps Build Thriving Oyster Reefs
8 Sep
Summary
- Recycled oyster shells from restaurants are vital for reef restoration.
- Dr. Keith Walters led an initiative to build reefs from recycled shells.
- Restored reefs became functioning habitat within one year.
Oyster reefs, once abundant in South Carolina's coastal marshes, have been depleted due to decades of fishing, which removed the essential shells needed for new oyster larvae to attach. Restoration efforts are now increasingly relying on recycled oyster shells from restaurants to provide this critical substrate.
Dr. Keith Walters, a marine science professor, led the Coastal Oyster Recycling and Restoration Initiative (CORRI) starting in 2013. This program collected oyster shells from eateries, constructed new reefs across six estuaries, and evaluated their function as habitat. Over 100 tonnes of restaurant shell were collected in a single season.
Historically, less than 10 percent of available oyster shell in South Carolina was recycled, forcing state programs to import shells. Volunteers now collect bagged restaurant shells, which are deployed in strategically chosen intertidal areas with suitable tidal flow. These restored reefs have proven effective, developing into functioning habitats supporting reef-associated species within a year of construction.
This rapid development into ecologically useful habitat, achieved within twelve months, demonstrates that recycled restaurant shells can effectively build robust oyster reef structures. The project successfully proved that collected, quarantined, and bagged restaurant shells can create vital marine ecosystems.
