Adult elvers are a type of eel that have reached maturity. They are also known as glass eels due to their transparent bodies. Adult elvers are found in the coastal waters of Europe and North America, where they migrate from the Sargasso Sea to spawn. They are an important part of the food chain, providing food for other species such as birds, fish, and mammals. They are also a valuable commercial resource, with their meat being used for human consumption and their skin for leather products.