Animal Species:Cox's Gudgeon, Gobiomorphus coxii (Krefft, 1864)
Cox's Gudgeon occurs from southern Queensland to southern Victoria, in coastal freshwaters and inland up to about 700 m altitude. Juveniles are able to climb waterfalls by rotating their pectoral fins so that the inside surfaces of the fins are pressed against the wall creating suction.
Standard Common Name
Mulgoa Gudgeon, Nepean Gudgeon
Cox's Gudgeon has a moderately elongate body and a slightly flattened head.
Live fish are brown, olive or purplish above, yellow to bluish on the sides and pale below. There are dark blotches on the upper sides and a dark stripe on the side of the body. The stripe is sometimes broken into blotches. Two brown bands extend from the rear of the eye. The two dorsal fins have dark stripes.
The species grows to 19 cm in length but is more commonly seen up to 15 cm.
Cox's Gudgeon is endemic to Australia, occurring from southern Queensland to southern Victoria.
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
The species is found in coastal freshwaters and inland up to about 700 m altitude.
Juveniles are often found at lower altitudes. It is believed that they are initially washed downstream and over spring and summer complete an upstream migration . They are able to climb waterfalls by rotating their pectoral fins so that the inside surfaces of the fins are pressed against the wall creating suction.
- Allen, G.R. 1989. Freshwater Fishes of Australia. T.F.H. Publications. Pp. 240.
- Allen, G.R., Midgley, S.H. & M. Allen. 2002. Field Guide to the Freshwater Fishes of Australia. Western Australian Museum. Pp. 394.
- 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.
- Larson, H.K. & D.F. Hoese in McDowall, R.M. 1996. Freshwater Fishes of South-Eastern Australia. Reed Books. Pp. 247.
- Merrick, J.R. & G.E. Schmida. 1984. Australian Freshwater Fishes. Biology and Management. John R. Merrick. Pp. 409.
Mark McGrouther , Collection Manager, Ichthyology
Tags fish, ichthyology, Cox's Gudgeon, Gobiomorphus coxii, Eleotridae, greenish-purplish, pale, long and skinny, 10 cm - 30 cm, blotches/mottled, freshwater, dark blotches on top, dark stripe on side of body,