Oscar (Astronotus ocellatus)

This South American cichlid has been established in Florida waters since the late 1950s, the result of a Dade County fish farm release. In South Florida, this predator is commonly taken by anglers. (Photo by Howard Jelks)

Brown Hoplo (Hoplosternum littorale)

This South American catfish has been established in peninsular Florida since the mid-1990s, source of introduction is unknown. It has recently invaded the Kissimmee River drainage and will likely spread into southern Florida within the next decade. (Photo by Howard Jelks)

Pike killifish (Belonesox beliznus)

Native to Middle America, this species was introduced into South Florida in 1957 when individuals reared for medical research purposes were released into a local canal. It is now firmly established. (Photo by Leo G. Nico)

Spotted tilapia (Tilapia maria)

This African cichlid was introduced into Florida as a result of escapes or releases from fish farms in Dade County, probably during the early 1970s. It is now one of the most abundant species in many South Florida canals. (Photo by Noel Burkhead)