Short Sunfish, Mola ramsayi (Giglioli 1883)


Other Names: Ramsay's Ocean Sunfish, Ramsay's Sunfish, Short Ocean Sunfish, Southern Ocean Sunfish, Southern Sunfish

A Short Sunfish, Mola ramsayi, stranded in shallow water in Port Phillip Bay, Victoria. Source: Martin Gomon / Museum Victoria. License: CC by Attribution

Summary:

Although very similar to the Ocean Sunfish, Mola mola, the clavus (tail) of the Short Sunfishhas more ossicles, and lacks the vertical band of denticles at its base.

The Short Sunfish is the most commonly seen Mola species in southern Australian waters.

Video of a Short Sunfish, Mola ramsayi.


Cite this page as:

Diane J. Bray, 2011, Short Sunfish, Mola ramsayi, in Fishes of Australia, accessed 22 Nov 2014, http://www.fishesofaustralia.net.au/home/species/784

Short Sunfish, Mola ramsayi (Giglioli 1883)

More Info


Distribution

An oceanic inhabitant found throughout the subtropical and temperate Southern Ocean; on rare occasions enters inshore waters including large estuaries. In Australian waters, known from northern New South Wales, around the south to about Geographe Bay, Western Australia, including Tasmania. Also recorded from Lord Howe Island.

Mola ramsayi is the most frequently encountered sunfish in southern Australia.

Features

Meristic features: Dorsal-fin rays 15–18; Anal-fin rays 15–18; Clavus 16 rays, ~12 ossicles; Pectoral-fin rays 11.

Body depth 65–88% SL; head length 29–39% SL; rough textured denticles covering body to base of caudal fin; clavus ossicles close together, much broader than spaces between; skin on rear of body uniform in texture with no visible band of reduced denticles at the base of clavus extending from dorsal fin to anal fin.

Colour

Dull brown to greyish above, paling to whitish below, with or without pale spots and blotches.

Feeding

Presumably feeds mostly on jellyfishes like Mola mola. 

Biology

Little is known of the biology of the Short Sunfish.

Conservation

• EPBC Act 1999: Not listed
• IUCN Red List: Not evaluated

Remarks


Similar Species

Key to species of Mola

1a           Clavus supported by about 12 rays, of which 8–9 bear ossicles; ossicles widely separated, less broad than spaces between them; visible band of reduced denticles (smoother to the touch than surrounding skin) at the base of the clavus extending between the dorsal and anal-fin bases .............................................................. Mola mola

1b           Clavus supported by about 16 rays, 12 bearing ossicles; ossicles close together, much broader than spaces between; no visible band of reduced denticles at base of the clavus (skin on rear of body of a uniform texture) .................... Mola ramsayi

Species Citation

Orthragoriscus ramsayi Giglioli, 1883, Nature 28: 315. Type locality: off New South Wales.

Author

Diane J. Bray

Short Sunfish, Mola ramsayi (Giglioli 1883)

References


Allen, G.R., Hoese, D.F., Paxton, J.R., Randall, J.E., Russell, B.C., Starck, W.A., Talbot, F.H. & Whitley, G.P. 1976. Annotated checklist of the fishes of Lord Howe Island. Records of the Australian Museum 30(15): 365-454 figs 1-2

Bass A.L., Dewar H., Thys T.M., Streelman J.T. & Karl S.A. 2005. Evolutionary divergence among lineages of ocean sunfish family, Molidae (Tetraodontiformes). Marine Biology 148: 405–414.

Bray, D.J. 2008. Family Molidae. pp. 858-861 in Gomon. M.F., Bray, D.J. & Kuiter, R.H (eds). Fishes of Australia's Southern Coast. Sydney : Reed New Holland 928 pp.

Fraser-Brunner, A. 1951. The ocean sunfishes (family Molidae). Bulletin of the British Museum (Natural History) Historical Series 1(6): 89-121 figs 1-18

Giglioli, E.H. 1883. Zoology at the Fisheries Exhibition II. Notes on the Vertebrata. Nature (London) 28: 313-316

Glover, C.J.M. 1994. Family Molidae. pp. 915-920, figs 808-810 in Gomon, M.F., Glover, C.J.M. & Kuiter, R.H. (eds). The Fishes of Australia's South Coast. Adelaide : State Printer 992 pp. 810 figs.

Hutchins, J.B. 2001. Molidae. pp. 3966-3968 in Carpenter, K.E. & Niem, T.H. (eds). The Living Marine Resources of the Western Central Pacific. FAO Species Identification Guide for Fisheries Purposes. Rome : FAO Vol. 6 pp. 3381-4218.

Hutchins, J.B. & Thompson, M. 1983. The Marine and Estuarine Fishes of South-western Australia. Perth : Western Australian Museum 103 pp. 345 figs.

Last, P.R., Scott, E.O.G. & Talbot, F.H. 1983. Fishes of Tasmania. Hobart : Tasmanian Fisheries Development Authority 563 pp. figs.

Scott, T.D., Glover, C.J.M. & Southcott, R.V. 1974. The Marine and Freshwater Fishes of South Australia. Adelaide : Government Printer 392 pp. figs.

Swainston, R. 2011. Swainston's Fishes of Australia: The complete illustrated guide. Camberwell, Victoria : Penguin Australia 836 pp.

Thys, T.M., J. Whitney, A. Hearn, K.C. Weng, C. Peñaherrera, L. Jawad, J. Alfaro-Shigueto, J.C. Mangel & S.A. Karl. 2013. First record of the southern ocean sunfish, Mola ramsayi, in the Galápagos Marine Reserve. Marine Biodiversity Records 6: e70 doi:10.1017/S1755267213000377. 

Waite, E.R. 1921. Illustrated catalogue of the fishes of South Australia. Records of the South Australian Museum (Adelaide) 2(1): 1-208 293 figs pl. 1

Whitley, G.P. 1933. Sunfishes. Victorian Naturalist 49: 207-213

Quick Facts


CAAB Code:37470001

Depth:0-5000 metres

Habitat:Pelagic, oceanic

Max Size:3.3 metres

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Species Maps

CAAB distribution map