Regent Carp Gudgeon, Hypseleotris regalis Hoese & Allen 1982

Other Names: Prince Regent Gudgeon

Regent Carp Gudgeon, Hypseleotris regalis. Source: Gerald R. Allen. License: All rights reserved

A small slender brown gudgeon with a slightly darker head, dark scale margins, and the bases of dorsal and anal fins dusky brown with whitish speckles; males with a black submarginal band and a white outer margin on dorsal and anal fins.

Cite this page as:
Martin F. Gomon, Hypseleotris regalis in Fishes of Australia, accessed 18 Sep 2021,

Regent Carp Gudgeon, Hypseleotris regalis Hoese & Allen 1982

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Known only in northwestern WA from the Prince Regent River (125°05'E) to the Roe River, (125°38'E). Inhabits quiet, clear freshwater pools over rock boulder substrate with aquatic plants or woody debris. Often seen in small groups hovering or swimming in midwaater.


Meristic features: Dorsal fin VI + 1, 9-10; Anal fin I, 10; Caudal fin (segmented rays) 15, (branched rays) 11-13; Pectoral fin 13-14; Pelvic fin I, 5; Transverse scales 8-9; Gill rakers 3-4 + 1+9-10 = 12-15; Vertebrae 25.
Body slender, depth 5.0-6.25 in SL, compressed; caudal peduncle long, longer than second dorsal fin base. Snout short, less than eye diameter. Mouth small, oblique, reaching to posterior nostril; teeth small in several rows in both jaws. Tongue tip truncate. Gill opening moderately broad, extending forward to below posterior end of preoperculum. Pectoral base narrow, with rays developed ventrally; a free fold of skin extending to upper attachment of opercular membrane above uppermost ray. Head pores absent. Cheek sensory papillae normally in longitudinal rows, with few vertical rows
Body scales large and ctenoid, lateral line absent; Longitudinal series 24-26. Predorsal scales forward to above middle of eye, 14-16 on dorsal midline. scales often cycloid on belly and nape. Cheek with 2 or 3 rows of small embedded cycloid scales. Operculum covered with medium-sized cycloid scales.
Two dorsal fins; first dorsal low, with rounded margin, height less than body depth, fourth and fifth spines longest; first dorsal membrane almost reaching base of second dorsal in males, fins widely separated in females; second dorsal similar in height to first dorsal, posterior dorsal and anal fin rays prolonged in males. Caudal short with rounded margin in males, truncate in females. Pectoral rays, except upper 2 or 3 and lower 1 or 2, branched once. Anal rays sometimes with a second branch near tip. Pelvic fins long and pointed, reaching to anus.


Males reaching 2.7-3.6 cm SL, females 2.3-3.0 cm SL.


Head dark brown, usually darker than body in males; body with 15-20 thin black chevron marks along mid-side; black bar at base pectoral fin extending ventrally to opposite third to seventh pectoral ray; black spot on posterior end of caudal peduncle below mid-side. Basal one-third of dorsal and anal fins dark brown to black, thin white stripe distally, and broader black stripe at margin; extreme distal tips white; second dorsal fin sometimes with white spots.


Little is known of the reproductive biology of this species, however it is likely to be and oviparous benthic spawner.


Forms small groups that hover or swim in mid-water.

A description appeared in Hoese, D.F. & Allen, G.R. (1983). A review of the gudgeon genus Hypseleotris (Pisces : Eleotridae) of Western Australia, with descriptions of three new species. Rec. West. Aust. Mus. 10(3): 243–261 figs 1–6 after the publication of the initial description in Allen et al (1982).

Similar Species

Closely related to H. aurea from the Murchison River of Western Australia but differs by the absence of preopercular pores. Differs from H. kimberleyensis and H. ejuncida on the basis of a combination of characters which includes a longitudinal scale count of 24-26; a moderately slender body, the depth at pelvic origin 16-20% of SL; pre-dorsal scales extending to behind eyes; modal gill rakers on outer face of second arch 10; colour pattern consisting of about 15-20 chevron marks on side; and pelvic fin origin positioned under posterior opercular margin.


The specific name regalis, is from the Latin for 'regal' or 'royal', in reference to the name of the type locality area, Prince Regent Reserve.

Species Citation

Hypseleotris regalis Hoese, D.F. & Allen, G.R. in Allen, G.R. (1982). Inland Fishes of Western Australia.  Perth : Western Australian Museum 86 pp. 6 figs 20 pls [57, pl. 13(5)] .

Wyulda Creek, Prince Regent Reserve, west Kimberley, WA.


Martin F. Gomon

Regent Carp Gudgeon, Hypseleotris regalis Hoese & Allen 1982


Allen, G.R., Midgley, S.H. & Allen, M. (2002). Field Guide to the Freshwater Fishes of Australia.  Perth : Western Australian Museum 394 pp.

Hoese, D.F. & Allen, G.R. (1983). A review of the gudgeon genus Hypseleotris (Pisces : Eleotridae) of Western Australia, with descriptions of three new species. Rec. West. Aust. Mus. 10(3): 243–261

Quick Facts

CAAB Code:37429028

Habitat:Freshwater pools

Max Size:3.6 cm SL


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