# Zebra mussels choke Spain’s water pipes at 40,000 per sq metre 2026-08-08T09:41:08+00:00 | World & Diplomacy | Indian Opinion Desk Corroboration: 1 independent outlet Zebra mussels have infested reservoirs and canals in northeastern Spain, with densities reaching 40,000 per square metre in some irrigation ponds, causing blockages and reducing pipeline capacity by up to 70 per cent. The Ebro River Basin Authority has confirmed adult mussels in the Santa Anna Reservoir and larvae in several others, threatening drinking water networks in Catalonia and Aragon. The species, first detected in Spain in 2001, hitchhiked from France on boat hulls. Biologists say eradicating them is impossible; the only option is to adapt infrastructure, duplicating pipelines, draining reservoirs annually, and designing shell traps. A 2026 study on shell transport in pressurised pipes aims to predict blockages. The invasion has already cost Spain an estimated 40 million euros over 20 years, according to a 2005 projection from the Ebro water authority. ## Coverage - timesofindia.indiatimes.com Tags: Ebro River, invasive species, mollusc invasion, Spain, water infrastructure, zebra mussels Canonical: https://indianopinion.org/zebra-mussels-clog-spanish-water-pipes-at-alarming-density/ License: Summary and commentary (c) Indian Opinion, reusable with attribution. Facts belong to the linked sources. Cite: https://indianopinion.org/zebra-mussels-clog-spanish-water-pipes-at-alarming-density/#story-in-brief Review state: restored archive article, accurate at time of publication, not offered to search indexes.