The Mussel Menace: When Nature Takes Its Toll on Human Infrastructure The spread of zebra mussels in northeastern Spain's waterways has reached a critical mass, with densities reaching 40,000 per square meter.
This invasive species, native to the Ponto Caspian region, has been making its way across Europe and North America for decades.
Recent genetic studies suggest that these mollusks originated from France, crossing the Pyrenees barrier via recreational boat hulls or live fish transport.