Flathead Galaxias, Galaxias rostratus Klunzinger 1872


Other Names: Beaked Minnow, Flat-headed Galaxias, Flat-headed Jolltail, Flatheaded Jollytail, Flat-headed Jollytail, Flat-headed Minnow, Murray Jollytail

Flathead Galaxias, Galaxias rostratus. Source: Tarmo Raadik. License: all rights reserved

Summary:

A long, slender galaxias with a distinctly flattened head, and very small pectoral and pelvic fins that are not fleshy at their bases.
Greenish-olive on back and sides, with irregular dark greyish-green blotches, bright silvery below lateral line, fins clear, eye silver.

The Flathead Galaxias is considered to be extinct in South Australia.


Cite this page as:
Martin F. Gomon & Dianne J. Bray, Galaxias rostratus in Fishes of Australia, accessed 15 Nov 2018, http://fishesofaustralia.net.au/home/species/3680

Flathead Galaxias, Galaxias rostratus Klunzinger 1872

More Info


Distribution

Endemic to the Murray Darling river system, and known historically from Rankins Lagoon, Bathurst, NSW (33º25’S), south and south-west through intermittent localities of as far as Mannum, South Australia (139º18’E).

The Flathead Galaxias inhabits still or gently flowing water on the margins of lakes, billabongs and streams. It usually occurs in shoals in midwater over rocky or sandy bottoms near aquatic vegetation.

Features

Meristic features:
Dorsal-fin rays: 10-13
Anal-fin rays: 13-18 (usually 14-16)
Pectoral-fin rays: 11-13
Gill rakers (1st arch): 16-17
Pelvic-fin spines/rays: I, 5
Vertebrae: 53-56 (usually 54-55)

Body elongate, slender; head flattened; snout relatively pointed; mouth large, reaching well below eyes; jaws equal; lateral canine teeth absent from jaws; depth at vent 10.1-14.2% SL;

Caudal fin slightly forked; dorsal fin well behind ventral fins, origin above vent, just forward of the anal fin; anal fin base is longer than dorsal fin base; pectoral fins small.

Size

To around 12 cm SL, commonly to 9 cm.

Colour

Back and sides olive-green with indistinct darker grey-green blotches; silvery on the ventral surface; fins mainly clear; eyes silver.

Feeding

Likely to be carnivorous feeding on small crustaceans and aquatic insects.

Biology

Spawning occurs in small ponds when water temperatures are between 9 and 14°C. Demersal eggs are deposited in mid-water by the female and then settle to the bottom. Eggs are 1.3-1.6mm in diameter. Larvae hatch after around 9 days at 6-7 mm TL.

Conservation

  • EPBC Act 1999 : Not listed
  • IUCN Red List : Vulnerable
  • Similar Species

    Similar in appearance to Galaxias maculatus, but differs in having a distinctively flattened head. large eyes, a distinctly flatter head, a longer snout and the mouth reaching well below the eyes (vs to the front of the eye).

    Species Citation

    Galaxias rostratus Klunzinger, 1872, Arch. Naturg. 38(1): 41. Type locality: Murray River, South Australia.

    Author

    Martin F. Gomon & Dianne J. Bray

    Flathead Galaxias, Galaxias rostratus Klunzinger 1872

    References


    Allen, G.R. 1989 Freshwater fishes of Australia. T.F.H. Publications, Inc., Neptune City, New Jersey.

    Allen, G. R. , H. Midgley, and M. Allen 2002 Field guide to the freshwater fishes of Australia. Field guide to the freshwater fishes of Australia.: I-xiv + 1-394.

    Klunzinger C.B. (1872) Zur Fische-fauna von Süd Australien. Arch. Naturg. 38(1): 17-47.

    Lintermans, M. 2007. Fishes of the Murray-Darling Basin : an introductory guide. Canberra : Murray-Darling Basin Commission, 157 pp.

    Llewellyn, L.C. 1971. Breeding studies on the freshwater forage fish of the Murray-Darling River system. The Fisherman N.S.W. 3(13): 1-12.

    McDowall, R.M. (ed.) 1980. Freshwater fishes of south-eastern Australia. Terrey Hills, N.S.W.: Reed, 208p.

    Merrick, J.R. & G.E. Schmida. 1984. Australian freshwater fishes: biology and management. Griffin Press Ltd., South Australia. 409 p.

    Paxton, J.R., D.F. Hoese, G.R. Allen & J.E. Hanley. 1989. Zoological Catalogue of Australia. Volume 7. Pisces. Petromyzontidae to Carangidae. Australian Government Publishing Service, Canberra. Zoological Catalogue of Australia. Volume 7. v. 7: i-xii + 1-665.

    Wager, R. 1996. Galaxias rostratus. In: IUCN 2012. IUCN Red List of Threatened Species. Version 2012.2. <www.iucnredlist.org>. Downloaded on 12 November 2011.

    Quick Facts


    CAAB Code:37102019

    Conservation:IUCN Vulnerable

    Habitat:Freshwater

    Max Size:12 cm SL

    Native:Endemic

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