… Beneath the aquamarine surface of Lake Tahoe is a battle that few people see. It’s a struggle between invasive species, transported to the lake by humans, and native species. It’s not a fair fight — which is why water managers are attempting to intervene and control the infestations of non-native plants and animals. The lake is now home to nearly a dozen invasive species. They originate from around the world and include Asian clams, New Zealand mudsnails and bullfrogs native to the Eastern United States. Domestic invasive species also affect the lake, such as the goldfish people dump into Big Blue that eventually grow into aquatic behemoths.