Florida restores oyster reefs by dumping shells at sea
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Since 2007, restaurants and oyster processing facilities in Florida have been recycling oyster and clam shells instead of discarding them. They sun-dry the shells for several months, then submerge them in the Gulf of Mexico. Between 2007 and 2024, over 500,000 tons of shells have been reintroduced to the sea.
The project aims to provide a solid base for oyster larvae to attach to in sandy areas.
The shells become covered with microorganisms that young oysters can then colonize, building their own shells and creating reef relief. Initially, the project faced skepticism due to slow results and organic residue promoting algae growth. However, pre-drying the shells now limits these issues and encourages microorganism growth. Over time, these artificial reefs have attracted crabs, shrimp, and fish, with some populations returning after a 25-year absence.
Oysters also filter water, with a single adult filtering up to 190 liters per day, improving water clarity and encouraging seagrass growth. The shells’ relief also reduces wave energy and coastal erosion. Louisiana and Texas have also adopted this method, though the Gulf of Mexico has lost approximately 85% of its historical oyster beds in the last two centuries.
