What looked like seafood waste ended up helping rebuild part of the Gulf.

From 2007 to 2024, Florida placed more than 500,000 tons of recycled oyster and clam shells from seafood restaurants and seafood plants back into Gulf waters, according to Upworthy. The project targeted depleted seafloor where oyster reefs had disappeared and soft bottom had taken over.

The idea faced early doubt. Because the shells were discarded material, some people worried adding them to an already stressed marine environment would cause more harm than good.

Researchers did not see dramatic changes right away. Upworthy reported that much of the restoration happened on a microscopic level before it became visible.

The shells gave young oysters places to settle and grow. As those oysters matured, they filtered the water and helped keep harmful algae blooms in check.

That helped create conditions for fish, turtles and dolphins to return in numbers not seen in more than 25 years, Upworthy reported.

Cleaner coastal water can benefit human health. Healthier oyster reefs can also support seafood supplies that many communities rely on.

The project also carried economic benefits. More abundant fish populations can help provide steadier income for fishermen, while cleaner waterways can help protect tourism revenue.

Oyster reefs can also act as natural storm barriers. They can help protect coastlines from damage that often leads to costly repairs for homes, businesses and public infrastructure.

Florida’s results have drawn interest from experts in coastal engineering and marine biology in North America, Europe and Australia, according to Upworthy. Similar shell recycling programs have already launched in Alabama, Texas, Louisiana, California, Mississippi and throughout the Carolinas.

Upworthy reported that shell recycling can help damaged ecosystems recover faster, especially in places where oyster populations have declined because of overharvesting or disasters such as the Deepwater Horizon oil spill.

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