Maïsadour launched a closed-loop fish farm in Langolen, France, positioning it as a model for sustainable aquaculture by combining environmental performance, animal welfare and local production.
On 5 June, 2025, Maïsadour inaugurated its fish farm in Langolen, Finistère, France, in the presence of government officials, journalists and economic partners. Driven by a strong commitment to Corporate Social Responsibility (CSR), this production site, one of the most innovative in the country, combines environmental performance, animal welfare and local production, in response to climate challenges and consumer expectations.
The site now operates in a closed circuit thanks to multi-stage biofiltration of the water, a technology that is unprecedented on an industrial scale in the field of aquaculture in France, greatly limiting the environmental impact while ensuring optimum living conditions for the fish.
The site’s environmental commitment is reflected in the deployment of 6,000 m² of photovoltaic shading, covering the entire facility, Maïsadour points out. The first section, already in service, provides 100% of the site’s self-consumption needs. A second section will be installed by the end of the year, and the surplus will be fed into the grid, contributing to the local energy transition.
A SHOWCASE FOR SUSTAINABLE FRENCH AQUACULTURE
The result of more than a year’s work, Maïsadour highlights the Langolen fish farm as an embodiment of the new model it wants to deploy: Efficient, responsible and exemplary in environmental and health terms.
The site now operates in a closed circuit thanks to multi-stage biofiltration of the water, a technology that is unprecedented on an industrial scale in the field of aquaculture in France, greatly limiting the environmental impact while ensuring optimum living conditions for the fish.
The site’s environmental commitment is also reflected in the deployment of 6,000 m² of photovoltaic shading, covering the entire facility. The first section, already in service, provides 100% of the site’s self-consumption needs. A second section will be installed by the end of the year, and the surplus will be fed into the grid, contributing to the local energy transition.
In terms of animal welfare, the company explains that the design of the ponds themselves (shaded, optimised water circulation, natural current stimulation) recreates conditions close to the natural environment, promoting the health and growth of the fish in a setting that respects their life cycle.
This innovative model now enables Langolen to produce more than 600 tonnes of trout a year (compared with 100 tonnes before the work, in an open circuit).
“This project is directly in line with our AMBiTiON 2030 strategy and illustrates our ability to bring together technological innovation, ecological sustainability, animal welfare and economic competitiveness,” said Christophe Bonno, CEO of Maïsadour.
A STRATEGIC SECTOR FOR THE FUTURE OF FRENCH FOOD
With close links to the production site in Castets, Landes, where the fish is processed under the Delmas and Delpeyrat brands, Langolen is fully integrated into a local “from egg to plate” supply chain. With 110 employees, Maïsadour’s aquaculture sector is supported by 3 fish farms and 1 processing site.
As a cooperative committed to the food transition, Maïsadour highlights its intention to use its aquaculture industry as a lever for regional economic development and sustainable re-industrialisation. This link between farming and processing strengthens France’s food sovereignty, while promoting short distribution channels and local production.
