A new aquatic invasive species has surfaced at Lake Tahoe: the New Zealand mud snail. The species was discovered on a boat at an off-ramp inspection station near U.S. 50 in Meyers on May 25. Tahoe Regional Planning Agency officials say they're concerned because the snails could adversely affect Lake Tahoe's fishery. The snails are typically transferred from water body to water body through non-motorized boats such as canoes and kayaks. The species has turned up elsewhere in California, including the Central Valley and Owens Valley. Unlike zebra and quagga mussels, mud snails do not affect water infrastructure and cling to boat engines. The TRPA is stepping up inspections of boats at Lake Tahoe in an effort to keep aquatic invasive species out of it.