# Rugulopteryx okamurae algae invasion in Spain and Portugal

> Live situation record from CLSTR: https://clstr.news/situations/rugulopteryx-okamurae-algae-invasion-in-spain
> Updated: 2026-09-02T13:20:45.000Z. Sources: 11. Developments: 3.

The invasive Asian algae species, Rugulopteryx okamurae, is causing significant environmental and socioeconomic damage along the Spanish coastline. First detected near the Strait of Gibraltar around 2016, the species has since spread across thousands of kilometers, displacing native biodiversity and threatening Posidonia oceanica meadows, particularly in areas such as Granada.

Experts, including biologist María Altamirano from the University of Málaga, indicate that the invasion is likely linked to human activities like maritime traffic and recreational boating. Due to the species’ high adaptability and the lack of sufficient resources, complete eradication is considered unlikely. Current management strategies focus on prevention, public education, and the preservation of reference ecosystems to mitigate the impact on the local fishing and tourism sectors.

The invasion has expanded into Portugal, with researcher Joaquim Parrinha from the University of Coimbra reporting an “exponential boom” in the last two to three years near the coast of Sines. Having likely migrated from the Mediterranean through the Algarve, the algae is now occupying vast areas of the seabed up to 12 meters deep. This surge is attributed to rising water temperatures, which allow the species to create dense underwater forests that block sunlight and reduce oxygen levels. These conditions threaten native species such as coral algae, Sargassum, laminaria, and Codium. Additionally, maritime agitation has been noted to dislodge the algae from the seabed, carrying heavy accumulations onto local beaches.

## Claims

- The invasive algae Rugulopteryx okamurae has seen an exponential boom in volumes over the last two to three years. (corroborated by 2 sources)
- The invasive species was first detected approximately 10 years ago near the Sines Port Marina. (corroborated by 2 sources)
- Rising water temperatures have contributed to the exponential growth of the algae in zones up to 12 meters deep. (corroborated by 2 sources)
- The algae likely arrived on the Portuguese coast from the Mediterranean, spreading from the Algarve to the north. (corroborated by 2 sources)
- Algae accumulation blocks light and reduces oxygen levels on the seabed. (corroborated by 2 sources)
- The invasive growth threatens native species including coral algae, Sargassum, laminaria, and Codium. (corroborated by 2 sources)

## Timeline

### 2026-09-02: Invasive algae threatens biodiversity on the coast of Sines

Invasive algae Rugulopteryx okamurae is spreading rapidly off the coast of Sines, Portugal, threatening marine biodiversity due to rising water temperatures and oxygen depletion.

3 sources. https://clstr.news/cluster/invasive-algae-threatens-biodiversity-on-the-coast-of-sines

### 2026-08-28: Asian algae invasion causes ecological damage in Spain

The invasive Asian algae Rugulopteryx okamurae is devastating Spanish coastlines, causing massive biodiversity loss and economic damage to fishing and tourism, with experts deeming eradication unlikely.

2 sources. https://clstr.news/cluster/asian-algae-invasion-causes-ecological-damage-in-spain

### 2026-08-24: Asian invasive algae causes unprecedented impact on Spanish coasts

Invasive Asian algae (Rugulopteryx okamurae) is causing unprecedented environmental and socioeconomic damage to Spanish coasts, displacing native Posidonia and reducing biodiversity.

6 sources. https://clstr.news/cluster/asian-invasive-algae-causes-unprecedented-impact-on-spanish-coasts

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Cite as: Rugulopteryx okamurae algae invasion in Spain and Portugal. CLSTR, https://clstr.news/situations/rugulopteryx-okamurae-algae-invasion-in-spain