Flatback Mangrove Goby, Mugilogobius platynotus (Günther 1861)


Other Names: Flat-backed Goby, Mangrove Goby, Pale Mangrove Goby

A male Flatback Mangrove Goby, Mugilogobius platynotus. Source: Rudie Kuiter / Aquatic Photographics. License: All rights reserved

Summary:
A brown goby with darker mottling and a faint mid-lateral row of darker spots and dark brown bands or spots on dorsal fins. Males have a yellow submarginal band on the dorsal fins and a yellowish anal fin.

Cite this page as:
Martin F. Gomon & Dianne J. Bray, Mugilogobius platynotus in Fishes of Australia, accessed 20 Oct 2018, http://fishesofaustralia.net.au/home/species/3065

Flatback Mangrove Goby, Mugilogobius platynotus (Günther 1861)

More Info


Distribution

Known only in southern Australia from Coomera Island, Queensland (27°51'S) to Western Port Bay, Victoria, and reported from South Australia. Inhabits soft silty bottoms in estuaries, usually amongst mangroves. Able to tolerate periods of freshwater.

Features

Meristic features: Dorsal fin V-VI + I, 8-10; Anal fin I, 8-10; Pectoral fin 13-17; Caudal fin (segmented rays) 15-17, (branched rays) 13-16; TRB 16-22; Gill rakers 2-4 + 5-6 = 7-10; Vertebrae 10 + 17.
Body slender, compressed, usually rounded anteriorly, depth 4.2-7.3 in SL. Head flattened somewhat, wider than deep; Snout broad, rounded. Anterior nostril in tube at preorbital edge, tube directed down and forward, preorbital usually distinctly curved forward to accommodate nostril; posterior nostril oval, near centre of anterior margin of eye. Eyes rather small, lateral, high on head, top usually part of dorsal profile, 3.5-5.2 in head. Interorbital broad, flat; interorbital, snout and sometimes side of head with sparsely scattered, fine, dark-pigmented villi. Mouth large, subterminal, slightly oblique, reaching past posterior margin of eye in adult males, to below anterior half of eye in females; lips usually smooth, lower lip free at sides, fused across front; upper jaw with largest teeth, stout and curved at front of outer row, other 3-4 rows with small sharp teeth; lower jaw with 3-5 rows of small, somewhat posteriorly pointed teeth; tongue tip blunt to rounded. Gill opening usually extending forward to under opercle; inner edge of pectoral girdle smooth with no ridge or flange, with low irregular fleshy ridge or raised bumpy flange, or with one or more fleshy knobs or flaps.
Body fully scaled, most cycloid; ctenoid scales on side in two patches, one behind pectoral fin, others on caudal peduncle forward to behind rear of second dorsal fin; lateral line absent; longitudinal series 45-59; predorsal scales, if present, evenly small, cycloid; midline of nape naked or with 2-21 (mean 4) small scales. Operculum with patch of small cycloid scales on upper third to half, or none; prepelvic area with patch of small cycloid scales before pelvics, occasionally naked; belly with patch of weakly ctenoid scales under pelvics, remainder cycloid. Head pores absent.
Two dorsal fins; First rather low, generally rounded, with tips of first to fifth spines free; spines slightly longer in males than females; spines barely reaching second dorsal fin origin when depressed; second dorsal and anal fins low, rounded, falling well short of caudal fin base when depressed. Caudal fin rounded. Pectoral fin somewhat rounded, all rays but first usually branched. Pelvic fins fully united into disc, very short and round, reaching to less than half distance to anus.

Size

To around 6 cm SL

Colour

Dull brownish grey, mottled, scale margins darker brown, many with midlateral brownish band formed by 9 or more indistinct small dark blotches, band often discontinuous; small rounded brown spot at middle of caudal base; series of broken narrow oblique brownish bars on upper anterior half of body, including brown oblique shoulder bar; some with indistinct brown mottling on side of body and fine dark brownish vermiculations over top and side of head, also with short bars from eye to upper jaw; iris marbled brown and gold with distinct gold rim around pupil. Dorsal fins with broad submarginal yellow band, fin margins dark brown; lower half of first dorsal and lower three-quarters of second dorsal pale greyish brown; first dorsal fin crossed with two longitudinal dark brownish grey streaks and intense black blotch at rear margin, blotch partly extending anteriorly into uppermost dark brownish grey streak; second dorsal with two rows of vertically oriented dark brown spots; anal fin yellowish grey with narrow white margin; caudal, pectoral and pelvic fins plain pale yellowish grey.

Biology

Likely to be oviparous, benthic spawners.

Species Citation

Gobius platynotus Günther, 1861, Cat. Fishes Brit. Mus. 3: 66. Type locality unknown.

Author

Martin F. Gomon & Dianne J. Bray

Flatback Mangrove Goby, Mugilogobius platynotus (Günther 1861)

References


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

Günther, A. (1861).Catalogue of the Acanthopterygian Fishes in the Collection of the British Museum.  London : British Museum Vol. 3 586 pp.

Hoese, D.F. & Larson, H.K. (1994). Family Gobiidae.  pp. 781–810, figs 690–714 in Gomon, M.F., Glover, J.C.M. & Kuiter, R.H. (eds) The Fishes of Australia's South Coast.  Adelaide : State Printer 992 pp. 810 figs [793] (as M. paludis).

Jenkins G.P. & Hatton D. (2005) Pop-net sampling to determine whether pale mangrove goby, Mugilogobius paludis, occurs in Corner Inlet/Nooramunga, Victoria. Internal Report No. 52. Primary Industries Research, Victoria.

Johnson, J.W. 1999. Annotated checklist of the fishes of Moreton Bay, Queensland, Australia. Memoirs of the Queensland Museum 43(2): 709-762.

Kuiter, R.H. (1993). Coastal Fishes of South-eastern Australia.  Bathurst : Crawford House Press 437 pp. figs [358] (as M. paludis).

Larson, H.K. (2001). A revision of the gobiid fish genus Mugilogobius (Teleostei: Gobioidei), and its systematic placement.  Rec. West. Aust. Mus. Suppl. 62: 1–233 [159].

Quick Facts


CAAB Code:37428190

Depth:0-5 m

Habitat:Mangrove areas

Max Size:6 cm SL

Native:Endemic

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