Mexico deploys navy to battle record sargassum bloom choking Caribbean beaches
Thousands of tons of seaweed wash ashore daily, threatening tourism. The Navy's cleanup effort is being watched as a potential regional model.
What to know
- Mexico's Navy is conducting large-scale sargassum removal operations to protect its tourism economy, removing hundreds of tons daily from Caribbean beaches using retrofitted vessels.
- Nearly 23 million tons of sargassum flowed into the western Caribbean this year—a record—driven by climate change, rising ocean temperatures, and nutrient runoff fueling explosive algal growth.
- The bloom now affects multiple countries across the Caribbean and up the U.S. coast; Mexico's cleanup efforts are being examined as a potential model for regional response.
- Sargassum has doubled in volume every five years since 2011, stretching from the Gulf of Mexico to Brazil and Africa's west coast.
Commander Álvaro Villanueva Mexican Navy commander leading sargassum operationsChuanmin Hu Director, Optical Oceanography Lab, University of South FloridaSantia Bradshaw Barbados Minister of Environment, National Beautification, and FisheriesMexican Navy Government agency conducting sargassum removal operations
How it unfolded 2 developments, newest first · click a bar or a number to jump articlesposts
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Regional leaders highlight sargassum crisis at global conference
At a global sargassum conference in Cancún, Barbados's minister of environment calls for regional and international support, framing the crisis as a threat to small island developing states.
“Our beaches are filthy, the smell is horrendous. Small island developing states need the support of our regional brothers and sisters.”
— Santia Bradshaw -
Not that bad actually. They probably clean this beach daily for tourists.Back when I lived in Cancún I remember 1-2 meters high mountains of sargassum in less touristic beaches like Playa Coral.Eg:
2 more of the top 3 · 8 posts in this stretch
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We have been having a similar issue in my hometown in Greece (photo from this June: https://i2.prth.gr/files/2026-06-08/thermaikos-plankton-mkt....). Ours is plankton and I think the cause might be runoff from fertilizers and years of wastewater. It started getting worse around 2017.
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Can this particular weed be eaten as-is, by human or animal, or is it known to e.g. be toxic or full of waste? Because it seems to me rather beneficial that the ocean washes it up on the shoreline ready for pick-up.
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background
Satellite data confirms record sargassum bloom in western Caribbean — Analysis from the Optical Oceanography Lab at the University of South Florida documents nearly 23 million tons of sargassum in the western Caribbean this year, the largest amount ever recorded. The Great Atlantic Sargassum Belt now stretches from the Gulf of Mexico to Brazil and Africa's west coast.
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Mexican Navy conducts sargassum removal operations at scale
Commander Álvaro Villanueva and crew aboard the Natans, a retrofitted former garbage vessel, remove over 400 tons of sargassum in a single operation, using conveyor belts and bulldozers to haul and pack seaweed from the water.
“It all joins up and keeps growing. We call them agglomerations when a cluster forms that's the size of a soccer field.”
— Commander Álvaro Villanueva -
background
Summer peak sargassum season reaches Puerto Morelos — At the height of the bloom season in Puerto Morelos, an hour south of Cancún, the ocean discoloration becomes severe enough that witnesses describe it as looking like chocolate.
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background
Mexico declares war on sargassum amid tourism threat — As the annual sargassum bloom begins, thousands of tons wash onto Mexico's Caribbean shores daily, threatening the economy of the Mayan Riviera and other beach destinations.
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background
Sargassum begins shifting from Atlantic habitat into open ocean — Ocean currents and winds sweep sargassum seaweed out of its traditional North Atlantic home into conditions that fuel explosive growth—rising ocean temperatures, direct sunlight, and abundant agricultural runoff.
Also covered reported alongside — the timeline has no entry for these yet
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first by HN Frontpage, 8d ago · also Boston Globe, NYT
What people are saying 2 voices from 1 site · best of 8 · verbatim
- Nov 1
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while sargassum is a bane for beaches, corals, and tourist industries, it's a big boon for ocean life far off the coast.
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who knew runoff from tons of fertilizer and adding load of CO2 to the oceans would grow plants