NOAA’s Coral Reef Helpers: Building Underwater “Coral Gardens” - Big Brain News
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"NOAA and its partners help damaged coral reefs by removing algae, bringing back algae-eating sea urchins, and growing corals to plant back onto reefs like underwater “coral gardens.”."

NOAA’s Coral Reef Helpers: Building Underwater “Coral Gardens”

April 9, 2026

NOAA shared how scientists and helpers are working to restore coral reefs—busy underwater neighborhoods where many sea creatures live. When fast-growing algae spreads like weeds in a garden, it can cover the reef and make it harder for corals to thrive.

One method is algae removal, and another is bringing back natural reef “clean-up crews.” Native sea urchins can help by munching algae, helping keep the reef from getting smothered.

Another careful step is growing corals and then planting them on reefs to help damaged spots recover. NOAA and partners are also working on growing and planting hardy corals and using many different kinds of coral, like planting a variety of seeds so the reef has a better chance during tough weather.

Reef restoration matters because coral reefs can support food, jobs, and coastal protection, and they are home to many ocean animals. It’s also a good reminder to think in systems: when one part of a habitat changes (like algae growing too fast), helpers can use several tools together to support balance again.