Animal Species:Southern Ocean Sunfish, Mola alexandrini (Ranzani 1839)
The Southern Ocean Sunfish is a huge round-bodied fish that is sometimes seen 'basking' on the water surface in southern Australian waters. Until recently it was called Mola ramsayi.
Standard Common Name
Southern Ocean Sunfish
The Southern Ocean Sunfish is a deep bodied species with high dorsal and anal fins placed posteriorly on the body. It has a small mouth with teeth fused into a parrot-like beak. The skin is leathery with rough denticles. Large fish have a ridge above and behind the eyes.
This fish is brown to grey above often with pale blotches, and paler below. After death it becomes white.
Five species of sunfish are found in Australian waters, the Southern Ocean Sunfish, Ocean Sunfish, Mola mola, Hoodwinker Sunfish, Mola tecta, Slender Sunfish, Ranzania laevis, and the Point-tailed Sunfish, Masturus lanceolatus. Mola alexandrini.has a large bump on the head and chin, Mola mola has a distinctly scalloped clavus and Mola tecta has a rounded clavus with a medial indentation.
The species grows to 3.3 m in length.
Ocean Sunfish, Sharptail Sunfish
It occurs in oceanic waters of the South Pacific Ocean.
In Australia it is found in temperate marine waters from northern New South Wales, around the south of the country, including Tasmania, to south-western Western Australia.
The map below shows the Australian distribution of the species based on public sightings and specimens in Australian Museums. Click on the map for detailed information. Source: Atlas of Living Australia.
Distribution by collection data
- Glover, C.J.M. in Gomon, M.F., Glover, C.J.M. & R.H. Kuiter (Eds). 1994. The Fishes of Australia's South Coast. State Print, Adelaide. Pp. 992.
- Hutchins, B. & R. Swainston. 1986. Sea Fishes of Southern Australia. Complete Field Guide for Anglers and Divers. Swainston Publishing. Pp. 180.
- Hutchins, B. & M. Thompson. 1983. The Marine and Estuarine Fishes of South-western Australia. Western Australian Museum. Pp. 103.
- Last, P.R., E.O.G. Scott & F.H. Talbot. 1983. Fishes of Tasmania. Tasmanian Fisheries Development Authority. Pp. 563.
- Sawai, E. et al., 2017. Redescription of the bump-head sunfish Mola alexandrini (Ranzani 1839), senior synonym of Mola ramsayi (Giglioli 1883), with designation of a neotype for Mola mola (Linnaeus 1758) (Tetraodontiformes: Molidae). Ichthyol. Res. - Online DOI 10.1007/s10228-017-0603-6.
- Thys, T.M. et al. 2013. First record of the southern ocean sunfish, Mola ramsayi, in the Galapagos Marine Reserve. Marine Biodiversity Records. DOI:10.1017/S175526723000377. Vol 6.
Mark McGrouther , Senior Fellow