The speckled longfin eel or Australian long-finned eel, Anguilla reinhardtii, is one of 15 species of eel in the family Anguillidae. It has a long snake-like cylindrical body with its dorsal, tail and anal fins joined to form one long fin. It usually has a brownish green or olive green back and sides with small darker spots or blotches all over its body. Its underside is paler. It has a small gill opening on each side of its wide head, with thick lips. It is Australia's largest freshwater eel, and the female grows much larger than the male. It is also known as the spotted eel.
The long-finned eel is a native of New Guinea, eastern Australia (including Tasmania), Lord Howe Island, and New Caledonia. Specimens have been found in some Pacific islands and in New Zealand. It can be found in many freshwater areas, including creeks, streams, rivers, swamps, dams, lagoons, and lakes.
Long-finned eels can grow to 2 metres (6 feet) for males and 1.58 metres for females, although landlocked eels can grow to 3 metres (10 feet) and weigh 20 kilograms (more than 40 pounds). They can live more than 100 years.