Quagga mussels are invasive shellfish that arrived in Utah in the boats of privately-owned watercraft trailered here from the Great Lakes. When left unchecked, they clog pipes and inlets to boats, pipelines and other lake infrastructure. They also cause great damage to native aquatic ecosystems. Sgt. Krystal Tucker with the Dept. of Wildlife Resources Aquatic Invasive Species Operations joins Nell and Chris on This Green Earth to talk about their program involving boat inspections for the mussels at some of the larger lakes in the state. How many they performed this past weekend and what they discovered.