Turning the Sargassum challenge into a circular seaweed economy
Our nearshore systems intercept Sargassum before it reaches the coast, preserve the biomass and transform it into valuable bio-based feedstocks
What Seafields Does.
From Sargassum influx to valuable resource
Every year, vast quantities of Sargassum arrive along coastlines across Mexico and the Caribbean. Once it reaches the beach, it rapidly decomposes - releasing methane, creating odour and leachate, damaging coastal environments and leaving communities with a costly clean-up and disposal problem. Much of the collected Sargassum ultimately ends up in landfill, with it’s potential value already lost.
Seafields intervenes before it reaches shore. Our nearshore SeaClear system intercepts incoming Sargassum and stores and stabilises it in our AlgaePonix™ paddocks, preserving the biomass and its potential value.
We then preprocess the Sargassum into reliable, bio-based feedstocks for biostimulants, biochar and biomaterials - turning a costly management challenge into a new valorisation pathway while protecting coastlines and creating local jobs and economic opportunities.
Our Services.
From coastal protection to valuable feedstocks
Intercept and
Store
We intercept incoming Sargassum nearshore using barriers, before it reaches the coast, helping protect beaches and sensitive coastal ecosystems.
The biomass is redirected into our AlgaePonix™ paddocks for controlled in-water storage.
Stabilise and
Harvest
Our AlgaePonix™ paddocks keep Sargassum alive and prevent the compaction and decomposition that occurs after beaching.
The preserved biomass can then be harvested in-water, helping create a more reliable supply of high-quality Sargassum for downstream processing.
Preprocess
Harvested Sargassum is separated into liquid and solid fractions, reducing weight and creating consistent inputs for downstream processing.
This allows more of the captured biomass to be put to productive use rather than becoming a disposal problem.
Valorise
The liquid fraction supports high-value biostimulants, while the solid fraction is processed into Sargassum pulp, creating a versatile feedstock for downstream product markets.
This includes biochar for cement and concrete applications, providing a high-value use for the biomass while supporting a zero-waste processing model.
“We believe Sargassum can become an asset for the communities currently bearing the cost of managing it.”
— John Auckland, CEO and Co-Founder
Sargassum Management.
Turning a costly challenge into productive infrastructure
Hotels, resorts and governments across Mexico and the Caribbean already spend heavily managing Sargassum - from beach clean-up and transport to disposal.
SeaClear redirects that spend into something productive. By intercepting Sargassum nearshore before it beaches, we help protect coastlines and tourism revenues, reduce the burden of clean-up and disposal, and preserve the biomass for valorisation.
Our deployments are designed to create local economic value too, working with communities and creating jobs around the management, operation and processing of Sargassum.
Sustainable Feedstock.
A new source of Sargassum biomass
Sargassum is abundant, but its natural influxes are seasonal and unpredictable, making it difficult for industry to rely on as a consistent feedstock.
Our AlgaePonix™ paddocks change that. By storing Sargassum alive in-water, we can preserve biomass captured during periods of high influx and provide a year-round source of Sargassum feedstock, rather than relying solely on seasonal arrivals.
Combined with our monitoring and preprocessing systems, this creates a more reliable, traceable source of Sargassum biomass for biostimulants, biochar, biomaterials and other sustainable product markets.
Our Mission
Creating value for coastlines, communities and industry
Coastlines & Marine Life
Intercepting Sargassum before it beaches helps protect sensitive coastal ecosystems. Our paddocks also create a safe haven for marine life, with our fish studies showing that they attract and provide refuge for fish and other marine species.
Recent peer-reviewed research published in Frontiers in Marine Science also found no significant impact on biodiversity in the waters surrounding our St Vincent aquafarm during the study period.
Communities & Jobs
SeaClear is designed to create local jobs and economic opportunity around the deployment, operation, harvesting and processing of Sargassum - helping ensure more of the value created stays within the communities most affected by Sargassum.
Circularity & Climate
By intercepting Sargassum before it beaches and decomposes, we keep valuable biomass in productive use. Through pathways including biostimulants, biomaterials and biochar, we can reduce waste, avoid emissions and create renewable and circular alternatives to fossil-based products.
Proven in the water.
Multiple pilots
Completed across the Caribbean
2023
First company to successfully domesticate Sargassum
XPRIZE
Carbon Removal runner-up
Start-up of the Year
Won Seedlegals start-up of the year 2025
Coldplay
Featured environmental business for the Music of the Spheres World Tour for three consecutive years
Partners and Customers
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