Speckled Goby, Redigobius bikolanus (Herre 1927)


Other Names: Bigmouth Goby, Bug-eyed Goby

Speckled Goby, Redigobius bikolanus. Source: Gerald R. Allen. License: All rights reserved


Cite this page as:
Martin F. Gomon, Redigobius bikolanus in Fishes of Australia, accessed 16 Nov 2018, http://fishesofaustralia.net.au/home/species/154

Speckled Goby, Redigobius bikolanus (Herre 1927)

More Info


Distribution

Known in northern Australia from Shark Bay, WA (25°20'S) to Brisbane, QLD (27°29'S) and elsewhere in the Indo-west-central Pacific; benthic in brackish mangrove estuaries and the lower reaches of freshwater rivers with mud, sand, rock or silt bottoms.

Features

D VI; 1, 6-8; A I, 6-8; C (segmented rays) 17; P 14-18; V I, 5; TRB 7-9; Vert 11 + 15 = 26.
Body compressed. Head somewhat compressed; interorbital narrow, flat. Anterior nostril in short tube, close to edge of upper lip. Mouth terminal, slightly oblique, usually reach well past rear of eye in adult males, and to below mid-eye in females; tongue tip rounded to truncate; gill openings narrow, reaching to just below operculum; pectoral girdle smooth or with low fleshy flange, occasionally with rudimentary knobs or lobes on anterior edge of cleithrum.
Body scales ctenoid, lateral series 21-27; scales cycloid before first dorsal fin, on operculum, pectoral fin bases and area before ventral fins; top of head scaled forward to close behind eyes, predorsal scales large, 5-8.
Two dorsal fins, first dorsal pointed, with triangular margin, first spine longest and may be filamentous in males, second dorsal and anal fins short-based, pointed posteriorly; caudal fin with rounded margin. Pectoral fins long, reaching to above anal fin origin, margin rounded to slightly pointed. Ventral fins rounded, fused to form cup-shaped disc.

Size

To around 4.2 cm SL.

Colour

Head and body pale grey to whitish with scale margins outlined in dark brown or blackish, forming network pattern; side of body with series of five dark brown bars or X-shaped blotches along mid-lateral line; blackish, slightly oblique, narrow bar on side of body, extending from below first dorsal fin ventrally to mid-line of belly; second blackish narrow bar present on lower half of body, bar joining its counterpart just behind anus; four characteristic blackish spots running along mid-ventral line of anal fin and caudal peduncle; base of caudal fin with two short brown dark brown blotches or horizontal bars, arranged one above the other on either side of middle of fin base, with small brown central blotch on mid-base. First dorsal fin transparent with round to oval black spot posteriorly and two dusky to blackish horizontal stripes, ventral-most running anteriorly from black spot and ending in small dark brown to blackish spot on anterior face of first spine, upper stripe narrower anteriorly running along middle to upper third of fin and ending in similar blackish spot on first spine. Second dorsal and anal fins transparent with dark brown to greyish streaks and spotting, which may form lines in second dorsal fin. Caudal fin transparent with three to six rows of fine dark spots and speckling.

Feeding

Omnivorous, feeding on aquatic insects, microcrustaceans and algae.

Biology

Oviparous, benthic spawners. Eggs are adhesive, with around 1,000 eggs laid over several hours. Very small larvae hatch after 7-12 days.

Remarks

The name is likely to be changed in the future. Earlier accounts of this species included an undescribed species from northern Australia.

Species Citation

Vaimosa bikolana Herre, A.W. (1927). Gobies of the Philippines and China Seas. Monogr. Bur. Sci. Manila 23: 1–352 pls 1–30 [151, pl. 11(2)].
Puru, Legaspi, Albay Province, Philippines.

Author

Martin F. Gomon

Speckled Goby, Redigobius bikolanus (Herre 1927)

References


Allen, G.R. (1989). Freshwater Fishes of Australia.  Neptune, New Jersey : T.F.H. Publications 240 pp. pls 1–63

Allen, G.R., Midgley, S.H. & Allen, M. (2002). Field Guide to the Freshwater Fishes of Australia.  Perth : Western Australian Museum 394 pp. [283].

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

Merrick, J.R. & Schmida, G.E. (1984). Australian Freshwater Fishes Biology and Management.  Sydney : J.R. Merrick 409 pp.

Pusey B., Kennard M. & Arthington A. (2004). Freshwater Fishes of North-Eastern Australia. CSIRO Publishing, Collingwood Australia. 684 pp.

Quick Facts


CAAB Code:37428244

Habitat:freshwater and brackish estuaries

Max Size:4.2 cm SL

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