St. Paul's fingerfin, Nemadactylus monodactylus, is a species of morwong

Morwong

Morwongs are perciform fishes comprising the family Cheilodactylidae. Most of the almost 30 species are found in temperate and subtropical oceans in the Southern Hemisphere, but three are restricted to northwest Pacific off Japan and China, and C. vittatus is restricted to Hawaii...

 native to the waters around Île Saint-Paul

Île Saint-Paul

Île Saint-Paul is an island forming part of the French Southern and Antarctic Lands in the Indian Ocean, with an area of . It is located about southwest of the larger Île Amsterdam, and south of Réunion...

 and Île Amsterdam

Île Amsterdam

New Amsterdam, Amsterdam Island, or Île Amsterdam is a French island in the Indian Ocean located at . It is part of the French Southern and Antarctic Lands.- History :...

 in the Indian Ocean

Indian Ocean

The Indian Ocean is the third largest of the world's oceanic divisions, covering approximately 20% of the water on the Earth's surface. It is bounded on the north by the Indian Subcontinent and Arabian Peninsula ; on the west by eastern Africa; on the east by Indochina, the Sunda Islands, and...

. It has also been reported from Tristan da Cunha

Tristan da Cunha

Tristan da Cunha is a remote volcanic group of islands in the south Atlantic Ocean and the main island of that group. It is the most remote inhabited archipelago in the world, lying from the nearest land, South Africa, and from South America...

, Vima Mount on the west coast of South Africa

South Africa

The Republic of South Africa is a country in southern Africa. Located at the southern tip of Africa, it is divided into nine provinces, with of coastline on the Atlantic and Indian oceans...

, and off Australia

Australia

Australia , officially the Commonwealth of Australia, is a country in the Southern Hemisphere comprising the mainland of the Australian continent, the island of Tasmania, and numerous smaller islands in the Indian and Pacific Oceans. It is the world's sixth-largest country by total area...

 and New Zealand

New Zealand

New Zealand is an island country in the south-western Pacific Ocean comprising two main landmasses and numerous smaller islands. The country is situated some east of Australia across the Tasman Sea, and roughly south of the Pacific island nations of New Caledonia, Fiji, and Tonga...

.

This species reaches a size of approximately 60 cm, and is benthopelagic, feeding on both bottom-dwelling and open-water organisms. Like other species of morwongs, it is occasionally harvested by commercial fisheries, but the effects of this on the overall species population have been relatively little studied.