The Asian Swamp eel, Monopterus albus, is native to tropical and temperate climates of eastern and southern Asia.  It is now well established in several canals in the Miami, Florida area over the past few years.  They can grow to about 3 m and prey on fish, crayfish, shrimp, frogs, tadpoles, etc. They are capable of breathing air and can travel short distances over land.  No one is sure how it got here.  The aquarium industry does not appear to raise them so maybe it was brought in as a food fish by some ethnic group. At this point the impacts are unknown.