Central Texas Lakes are experiencing an infestation of Zebra Mussels. What are zebra mussels? Zebra mussels are a type of freshwater mollusk that often pose a significant issue for buildings, plants, and equipment. This invasive aquatic species can attach to almost any piping surface, which can create blockage and cease waterflow. In addition to forming dense colonies together throughout an area, these mussels continue to reproduce each year as well.