The invasive Quagga mussel is spreading rapidly in Swiss waters, causing significant ecological disruption and costing millions in infrastructure damage. Originally from the Dnieper Delta, the mussels lack natural predators in Switzerland, impacting local ecosystems by consuming algae and plankton. Experts are urging immediate action, including stringent cleaning protocols for recreational equipment to prevent further spread. Current regulations are inconsistent across cantons, leading to calls for unified legislation to manage the crisis effectively.