Overview

Comprehensive Description

Biology

Inhabits stream margins over rock or sand bottoms, sometimes among aquatic vegetation. Still or gently flowing water on the margins of lakes, billabongs and streams. Usually swims in midwater over rock or sand bottoms, also in the vicinity of aquatic plants. Shoal forming (Ref. 44894). Feeds on a wide range of aquatic insects and crustaceans. Spawning has been recorded between August and September (Ref. 44894). Each spawning female releases 3,000-7,000 eggs which are slightly adhesive and settle to the bottom. Hatching in nine days at 9-14°C; newly hatched fry are 6-7 mm long.
  • Allen, G.R. 1989 Freshwater fishes of Australia. T.F.H. Publications, Inc., Neptune City, New Jersey. (Ref. 5259)
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Distribution

Oceania: Murray River and tributaries in South Australia, Victoria and New South Wales, Australia. Has also been reported from several major tributaries of the eastern Murray system including Lachlan, Murrumbidgee, Loddon, Goulburn, Ovens and Mitta Mitta Rivers.
  • Allen, G.R. 1989 Freshwater fishes of Australia. T.F.H. Publications, Inc., Neptune City, New Jersey. (Ref. 5259)
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Australia.
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Physical Description

Size

Maximum size: 115 mm SL
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Max. size

12.0 cm SL (male/unsexed; (Ref. 44894))
  • Allen, G.R., S.H. Midgley and M. Allen 2002 Field guide to the freshwater fishes of Australia. Western Australian Museum, Perth, Western Australia. 394 p. (Ref. 44894)
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Ecology

Habitat

Habitat and Ecology

Systems
  • Freshwater
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Environment

benthopelagic; freshwater
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Trophic Strategy

Inhabits stream margins over rock or sand bottoms, sometimes among aquatic vegetation. Feeds on a wide range of aquatic insects and crustaceans.
  • Allen, G.R. 1989 Freshwater fishes of Australia. T.F.H. Publications, Inc., Neptune City, New Jersey. (Ref. 5259)
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
VU
Vulnerable

Red List Criteria
A1c

Version
2.3

Year Assessed
1996
  • Needs updating

Assessor/s
Wager, R.

Reviewer/s

Contributor/s

History
  • 1994
    Rare
    (Groombridge 1994)
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Threats

Vulnerable (VU) (A1c)
  • IUCN 2006 2006 IUCN red list of threatened species. www.iucnredlist.org. Downloaded July 2006.
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Wikipedia

Flathead galaxias (Australia)

The flathead galaxias, Galaxias rostratus, is a freshwater fish found in lowland rivers and streams and associated billabongs, backwaters, etc. of the southern Murray-Darling river system in Australia.

Flathead galaxias continue a pattern found in Murray-Darling native fish of speciation into upland and lowland habitats. Flathead galaxias are found in lowland habitats, while the mountain galaxias species complex, containing at least seven species of Galaxias (research is ongoing) are found in upland habitats, as well as "midland" or upland/lowland transitional habitats.

Morphology[edit]

The fish is similar in appearance to the common galaxias, except with a distinctly flattened head, larger eyes and longer snout.[1] It has an olive green back and sides with indistinct grey to green blotches and silvery bottom. Adults are commonly 9 cm but found up to 12 cm long.

Conservation[edit]

Serious concerns exist for flathead galaxias. They, along with a number of other small native forage fish, are disappearing from vast tracts of the Murray-Darling basin. The species is considered extinct in South Australia.[1] Along with river regulation, destruction of water clarity and submergent macrophytes ("water weed") by exotic, illegally introduced common carp (Cyprinus carpio) appear to be having a devastating effect on this species. Many or all of the small native forage fish of the southern Murray-Darling system apparently used these weeds beds for shelter, feeding, and spawning sites.

References[edit]

  1. ^ a b Gomon, Martin; Bray, Dianne. "Flathead Galaxias, Galaxias rostratus". Fishes of Australia. Retrieved 14 September 2014. 
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