Nel Blu — Issue 013

nel blu™ ~ italian for in the blue
stories about the people, ideas, and investments shaping the future of our ocean

Stanford researchers found that a bleached coral can fully recover in weeks, simply by touching a healthy one.

It started by accident. In a Stanford lab, two coral fragments from the same colony, one healthy, one bleached ghost-white, tipped over in a tank and came to rest touching each other. 

Where they met, color crept back into the dying coral.

That stray observation became a discovery. In a study published this month in Science Advances, researchers showed that a bleached coral, placed in contact with a healthy, genetically identical one, can fully recover in about seven weeks, the fastest coral recovery ever documented.

Here’s what’s happening. When the ocean overheats, corals expel the colorful algae living in their tissues, the partners that feed them. Stripped of that algae, the coral turns white, starves, and often dies. This is bleaching, and it’s killing reefs around the world. 

But Stanford’s team found that when a healthy coral touches its bleached twin, their tissues fuse, and life-giving algae begin flowing across the bridge within three days. Once inside, the algae multiply at roughly ten times their normal rate, flooding the starving coral back to health.

Why It Matters

Reefs cover less than 1% of the ocean but shelter a third of all known marine species, and bleached corals have long been written off as nearly lost. This research shows they aren’t dead yet, and that recovery might be jump-started in weeks rather than years.

The scientists stress that because this was done in a lab and needs a healthy, identical clone for every bleached coral, it isn’t yet realistic at the scale reefs need. Stanford’s next step is delivering the healing algae in large batches, without the one-to-one contact. A real discovery, with a hopeful start.

👉🏻 Watch the incredible transformation here!

A new study put a price on what restored oyster reefs could be worth. The number is staggering, and so is how much we’ve already lost.

Let’s start with the number that stops you: restored oyster reefs could be worth as much as $12 trillion a year.

That’s the finding of a new study in Frontiers in Marine Science, which calculated the “gross ecosystem product” of oyster reefs, essentially a GDP for nature, across the ten countries with the most potential, including the US, Australia, Chile, Japan, and France. Add up everything healthy reefs quietly do (filter water, store carbon, feed people, and shield coastlines from storms) and the value runs to twelve trillion dollars annually. One caveat the authors state: it’s a best-case ceiling, not a forecast. Think of it as the size of the prize, not money anyone is guaranteed to collect.

That’s the prize if we rebuild what we’ve lost, and we’ve lost almost all of it. 

An estimated 85% of the world’s oyster reefs have vanished over the past century. Decades of overharvesting and destructive dredging that scrape reefs flat, in addition to pollution and runoff that smother oysters in silt and disease. In those same ten hotspot countries, reefs now fill just 10% of the coastal habitat that could support them.

In the US alone, the study valued the water purification, carbon storage, and nitrogen removal from fully restored reefs at $25.1 billion a year, according to Oceanographic Magazine.  A single reef system can filter quadrillions of liters of water annually, no treatment plant required.

Oysters are one of the clearest cases for a simple idea gaining ground in ocean finance, that protecting nature isn’t a cost, it’s an asset with a return.

But the study doesn’t sugarcoat what it would take: 90% of suitable sites would need active restoration, and 80% would need protection, to come anywhere close. Lead author Dr. Matteo Convertino also warns that warming seas will chip away at the potential over time. The $12 trillion is a ceiling we’re drifting away from, not toward. But it’s also a map of where the returns are, if anyone decides to go collect them.

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_{Sources: Oceanographic Magazine & Frontiers in Marine Science & NOAA}

What You’re Looking At:
A coral glowing neon purple off New Caledonia, caught mid-bleaching in 2016. When heat forces a coral to expel the algae it lives on, its bare skeleton reflects sunlight back through its tissue like a mirror. Some corals fight back by producing vivid pigments that act like sunscreen, shielding what’s left of the algae so it can return. Scientists call it colorful bleaching, and it’s the hopeful kind: these are often the reefs most likely to recover.

COP31 • November 9th - 20th • Antalya, Türkiye
COP is the world’s biggest annual climate summit, run under the UN climate convention first adopted in 1992. Every year it brings together heads of state, ministers, scientists, and business and civil society leaders to negotiate global action on climate change. This year marks the 31st round, hosted by Türkiye.

BlueInvest Africa • Nov 2 - 3 • Cape Town, South Africa

Tomorrow Blue Economy • Nov 3 - 5 • Barcelona

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