In the heart of the Bahía de Cádiz Natural Park, across 39 hectares of the abandoned La Esperanza salt pan, Professor Javier Benavente stands among the restored channels and explains how university research is turning a dying heritage into a living laboratory. Here, where salt was once extracted by traditional methods, microalgae are now cultivated and tidal energy is being studied.
Since the mid-twentieth century, the number of active salt pans in the bay has fallen from 155 to four or five. Abandoned plots lost not only economic value but also cultural and ecological value: unique ecosystems disappeared, and biodiversity declined. The restoration of La Esperanza since 2012, when the university obtained the concession, has shown results — the number of Kentish plover nests has risen from 30 to 104.
Benavente and the director of the research centre, Macarena Castro, are not merely restoring old methods. They are seeking new economic models: cultivating macroalgae, using salicornia as an alternative to salt and even for stroke prevention, and experimenting with semi-extensive fish farming combined with tourism. The goal is to make the salt pans competitive in the twenty-first century.
The key instrument is land stewardship agreements. The University of Cádiz has already concluded such agreements with three other local enterprises: Estero Natural, Santa Teresa and Marambay. The scientists provide knowledge and advice, while the entrepreneurs provide practical operation. This is not charity but calculation: without a sustainable economy, traditional salt pans are doomed to fall into oblivion once again.
The LIFE CUSTODIA project, under which the initiative operates, emphasises the voluntary nature of such agreements. Coordinator Víctor Gutiérrez notes that across Spain more than 4600 such agreements already cover almost 700 thousand hectares. Success depends on whether nature conservation can be combined with real income for local residents.
The public image of scientists as guardians of pure science diverges here from reality: they actively seek market niches because they know that without economic return even the most valuable ecosystems will not survive. The story of La Esperanza confirms their approach: research works only when it finds practical application.
As in the old Spanish saying that "the sea does not forgive those who forget it," the scientists of Cádiz remind us that preserving heritage requires not only memory but also constant renewal. Without this, even the most ancient salt pans turn into an open-air museum.
The initiative is already extending beyond the region: in March 2027, national land stewardship days will be held in Chiclana, and the project plans to train 300 specialists and issue three policy documents for Europe. This is not merely a local story — it is a model of how science can bring abandoned corners back to life if it finds common ground with those willing to earn a living from it.
