ANIMAL SPECIES:Flyspecked Hardyhead, Craterocephalus stercusmuscarum (Günther, 1867)
The Flyspecked Hardyhead has a slender body covered with black dots. The species is endemic to Australia. It occurs in some freshwater streams of the Northern Territory to southern Queensland.
Alternative Name/s
Freshwater Hardyhead, Freshwater Silverside, Line-eye, Mitchellian Hardyhead, Northern Fresh Water Hardyhead, Speckled Crat, Worrell's Freshwater HardyheadIdentification
The Flyspecked Hardyhead has a slender body covered with black dots. This pattern gave rise to the common name. The fish is golden yellow to deep green above, changing to white below. A dusky to silver stripe runs from the snout to the caudal peduncle.
Size range
It grows to about 8 cm in length.Similar Species
The related Unspecked Hardyhead, Craterocephalus fulvus, was originally described as a subspecies of C. stercusmuscarum. This species occurs in coastal drainages from southern Queensland to northern New South Wales and the Murray-Darling River system.Distribution
The species is endemic to Australia. It occurs in some freshwater streams of the Northern Territory to southern Queensland.
Distribution by collection data
Biomaps map of Flyspecked Hardyhead specimens in the Australian Museum collection.
Behaviour and adaptations
Feeding and Diet
The Flyspecked Hardyhead eats mainly mosquito larvae and aquatic insects. It will also eat crustaceans and has been observed eating algae in aquaria.
Living with us
Economic/social impacts
It can be easily kept in aquaria but its natural colours often fade.
Classification
- Species:
- stercusmuscarum
- Genus:
- Craterocephalus
- Family:
- Atherinidae
- Order:
- Atheriniformes
- Class:
- Actinopterygii
- Subphylum:
- Vertebrata
- Phylum:
- Chordata
- Kingdom:
- Animalia
References
- Allen, G.R. 1989. Freshwater Fishes of Australia. T.F.H. Publications. Pp. 240. Ivantsoff, W. & L.E.L.M. Crowley. in McDowall, R.M. 1996. Freshwater Fishes of South-Eastern Australia. Reed Books. Pp. 247.
- Hoese, D.F., Bray, D.J., Paxton, J.R. & G.R. Allen. 2006. Fishes. In Beesley, P.L. & A. Wells. (eds) Zoological Catalogue of Australia. Volume 35. ABRS & CSIRO Publishing: Australia. parts 1-3, pages 1-2178.
- Merrick, J.R. & G.E. Schmida. 1984. Australian Freshwater Fishes. Biology and Management. John R. Merrick. Pp. 409.
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A Fly-specked Hardyhead at Sydney Aquarium View full size
Stuart Humphreys
© Australian Museum
Fly-specked Hardyhead, Craterocephalus stercusmuscarum View full size
Stuart Humphreys
© Australian Museum
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