The American eel (Anguilla rostrata) is an amazing fish, migrating great distances during its life cycle. These fish are catadromous, meaning they are born in salt water and live most of their adult lives in fresh water. Eels are born in the Sargasso Sea between Bermuda and Puerto Rico, then swim and drift on ocean currents to the East and Gulf Coasts of North America. On the East Coast, they are found in almost every river from Florida to Maine. Scientists have noted steep declines in eel numbers in the last few decades. Overfishing, parasites, climate change, and dams or other barriers to migration may all affect eel survival. By studying eels, students not only get to know an important species, but they also explore the interconnectedness of oceans, coasts, rivers, and watersheds.