Twenty six hundred Iberian crabs return to Cazorla to save the species

Published on May 23, 2026 | Translated from Spanish

The Andalusian Regional Government has reintroduced 2,600 specimens of the Iberian crayfish into the Cazorla, Segura, and Las Villas Natural Park. This endangered species is trying to recover its territory from the invasion of the red swamp crayfish and aphanomycosis, a lethal disease that has decimated its populations in recent years.

Underwater riverbed scene in Cazorla natural park, two thousand six hundred native Iberian crayfish being released from plastic transport containers by conservation technicians wearing waders, crayfish crawling over smooth stones and submerged roots, one crayfish showing early signs of fungal infection with white patches on its carapace, an invasive red swamp crayfish lurking in the background among rocks, clear mountain water with sunlight filtering through the surface, bubbles rising during the release process, photorealistic wildlife documentary style, macro detail on claws and antennae, natural riverine lighting with greenish-blue water tones, ultra-detailed exoskeleton textures, conservation action demonstrating species reintroduction

How technology monitors the return of the native crustacean 🦞

To ensure the survival of the specimens, technicians use geolocation systems and selective traps that capture invasive crayfish without harming the Iberian ones. Additionally, genetic analyses are applied to verify the purity of the species, along with water quality sensors that detect changes in pH or temperature, key factors to avoid stress in the new river inhabitants.

Crayfish vs. foreigners: the aquatic civil war no one saw coming ⚔️

While politicians talk about borders, a relentless migratory battle is being fought in the rivers of Jaén. The red swamp crayfish arrived without papers and took over the territory, but now the Iberian crayfish are returning with the support of the Regional Government. Of course, no one has asked them if they want to live in a natural park or prefer to move to the coast. At least, they won't pay rent.