The naked carp is the dominant fish species in Qinghai Lake, China's largest inland saltwater lake. As one of the few species adaptable to cold water with high levels of salt and alkalinity, the fish plays an important role in the lake's ecosystem. It serves as the primary food for many birds and also helps keep the water clean by feeding on algae. And true to its name, this remarkable fish is nearly scaleless. Why? Watch the video to find out.