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A Day on the Tides: Life at Esteros Lubimar
As the first light of dawn spreads across the wetlands of Barbate, a small fishing town in southern Spain, Esteros Lubimar is already awake.
The esteros, traditional and natural tidal ponds connected to the Atlantic Ocean through the estuaries of Andalucía, are calm at this hour. Flamingos wade through the shallows… an osprey glides overhead. The incoming tide begins to push fresh seawater into the wetlands, continuing a cycle that has shaped this landscape for centuries.
Here, seabass and seabream are raised in a system that works with nature, using the movement of the tides to bring fresh seawater, oxygen and natural nutrients into the farm each day.
In 2026, Esteros Lubimar became the first farm in the world to achieve certification against the ASC Farm Standard; recognition of decades spent refining a farming model that works with nature, restores wetlands and produces fish sought after by some of the world’s most celebrated chefs.
For the team, the achievement is about much more than being first. As Gontran De Ceballos, Sales Manager at Lubimar puts it:
“The new generation wants to know the story behind their food; where it comes from, how it was produced, and whether it gives something back to the world. We believe our fish has that story; ASC certification helps us tell it.”
ASC Certification represents recognition of a model the family farm has been refining for more than three decades, one built around fish welfare, wetland restoration, biodiversity and support for local communities.
Harvesting with Purpose
For the Lubimar team, the day starts not with harvesting fish, but with understanding what their customers need.
While much of the seafood industry harvests first and sells later, here the process works in reverse. Orders are confirmed before a single fish is taken from the ponds, ensuring that only the required quantity is harvested each day.
“We changed the rules of the game. First, we ask our customers around the world: ‘What do you want for today?’ Then we harvest.”
Once the orders are established, teams head out onto the esteros. Fish are harvested carefully by hand, a practice rooted in the farm’s belief that fish welfare matters throughout every stage of production, including at harvest.
The seabass and seabream raised here grow slowly, taking almost three years to reach market size. Living at low densities in large ponds, they have space to swim and grow naturally, reducing stress and eliminating the need for antibiotics – all in the name of ensuring the highest possible quality.
This focus on welfare and quality is one of the reasons the ASC Farm Standard resonated with the team. Rather than requiring them to change who they were, the certification process helped demonstrate and strengthen practices they had long believed in.
Working with Nature
The estero system itself is central to Lubimar’s approach.
Every day, fresh seawater flows through the farm with the rhythm of the tides. When the tide rises, pure saltwater comes directly from the Atlantic into the ponds. When the tide falls, water continues to circulate from the surrounding natural wetlands, keeping oxygen levels high and bringing natural nutrients into the system.
Part of the fishes’ diet comes from this ecosystem, supplemented by feed from ASC-certified mills. Rather than separating aquaculture from nature, the farm relies on its connection to the wider landscape. Every aspect of the farm is designed to support fish welfare and maintain a healthy environment.
“When we arrived in Barbate, this was an abandoned marshland. Today it has become a place where business and biodiversity live together. For me, that is sustainability.”
From Wetlands to Leading Restaurants Around the World
Back at the packing facility, the morning harvest is prepared for shipment. Within hours, fish are heading to restaurants and markets across Spain.
Some of that fish travels just an hour up the coast to Aponiente, the acclaimed three-Michelin-star restaurant led by renowned chef and sustainability advocate Ángel León, also known as ‘El Chef del Mar’. For more than a decade, León has been one of Lubimar’s most passionate champions, introducing diners from around the world to the unique flavours and story of the esteros.
For León, the connection goes far beyond sourcing exceptional seafood.
“I fell in love with the ecosystem where Lubimar’s fish live. The dream was always to show the world that these fish were different.”
That difference begins with the esteros themselves. León describes them as “a spa for fish”, a place where seabass and seabream can grow slowly in a calm, natural environment shaped by tides, wind and time.
“When you eat a seabream or seabass from Lubimar, you immediately notice the texture and the flavour. But behind that fish there are people, and there is an ecosystem that makes it unique.”
By the following day, some will be arriving in New York. More will make their way to kitchens in Hong Kong and beyond.
Before any fish leaves the farm, however, another daily ritual takes place, as Gontran explains.
“Every morning we cook and taste some of the fish we harvest. It’s something the family has done for more than 35 years. It’s our way of checking the flavour and making sure we are sending the best quality fish into the world.”
As the day progresses, attention shifts from harvesting to monitoring. Teams move across the farm checking water flow, oxygen levels, and salinity. Later, afternoon and night crews will continue the work.
Because the esteros depend on the movement of water, monitoring never truly stops.
A Landscape Reborn
Looking across the site, what stands out is how little of it is dedicated to fish production.
Although Lubimar spans hundreds of hectares, only around 35% of the area is used for farming. The remaining 65% is maintained as natural wetland habitat.
These extensive areas are not simply left untouched; they are an integral part of the farming system, helping move water through the esteros while providing habitat for wildlife.
It was not always this way. When the company arrived in Barbate, the area was an abandoned saltworks and marshland.
Today, it has become a thriving wetland ecosystem where flamingos, spoonbills, ospreys and countless other species live alongside the farm. The restoration of these wetlands has created a landscape where aquaculture and biodiversity support one another.
The result is a farming system that produces seafood while also contributing to the health of the surrounding ecosystem: a principle that sits at the heart of the ASC Farm Standard.
A Broader View of Sustainability
This commitment to balancing fish welfare, environmental stewardship and community responsibility culminated in Lubimar becoming the first farm in the world certified to the ASC Farm Standard.
For Juan Siquier, Quality and Environmental Manager at Lubimar, the significance goes far beyond achieving a certification:
“The ASC certification process challenged us to think differently. Before, we focused mainly on production and the environment. Now we think more broadly about sustainability, local communities, fish welfare, education of our employees and the future of aquaculture.”
Preparing for certification required new management systems, extensive training and a deeper understanding of how the farm fits within the social and environmental fabric of Barbate.
For the team, the result was not simply achieving certification but gaining a wider perspective on what aquaculture can contribute.
That contribution is particularly important in a region that has historically faced high levels of unemployment. For Lubimar, sustainability is not only about the environment. It is also about supporting the local community.
Today, more than 100 people work directly at the family farm, creating jobs linked to the long-term stewardship of the surrounding wetlands.
The farm’s influence extends beyond Barbate. Through partners like Aponiente, the story of the esteros is shared with seafood lovers from around the world. Before guests sit down to eat, they are introduced to the marshes, the tides and the years of care that go into producing a single fish.
Chef Angel León often speaks to guests about the role of time in the esteros. A seabream may take three and a half years to reach just one kilogram, a pace that reflects Lubimar’s commitment to working with nature rather than rushing it.
As Juan Siquier reflects, ASC certification became recognition of a journey that had been decades in the making, while also providing a framework for continuous improvement:
“ASC is not just a certificate. For us, it is recognition of 35 years of doing things the right way.”
Raising the Profile of the ‘Estero’ Way
As evening approaches, the light softens across the esteros. The day team heads home and another shift arrives to continue monitoring the water through the night. The tide continues its steady movement in and out of the wetlands, just as it has for generations.
For Esteros Lubimar, that rhythm lies at the heart of everything they do.
The farm’s story is not simply about producing seabass and seabream. It is about restoring wetlands, supporting wildlife, creating local jobs, and working with nature’s cycles to raise fish in a way that respects both the environment and the communities around it.
Becoming the first farm in the world certified to the ASC Farm Standard has given Lubimar something it has never had before: a globally recognised way to demonstrate what the estero system can achieve.
That story is already reaching new audiences. At Aponiente, chef Angel León has even created dishes inspired by the esteros themselves, using food to tell the story of the marshlands and the people who care for them.
“I feel very proud to talk about Esteros Lubimar every day with our customers. It is a brand I carry in my heart.”
For Gontran, ASC certification is not simply a badge. It is recognition of a farming philosophy that has been refined over decades and an opportunity to share it with a wider audience:
“We are showing that there is a different way to farm fish. Now it’s time for the world to discover the estero way.”
As the tide continues to flow through the wetlands of Barbate, the team hopes their achievement will do more than celebrate one farm. They hope it will shine a light on a model of aquaculture where productive farming, thriving ecosystems and strong local communities can all exist together.
