Barred Threefin, Brachynectes fasciatus Scott 1957

Other Names: Southern Barred Triplefin, Weedy Threefin

Barred Threefin, Brachynectes fasciatus. Source: Barry Hutchins / Western Australian Museum. License: CC By Attribution-NonCommercial-ShareAlike

A brownish triplefin with dark blotches along the side, wavy lines on the fins, and often a purplish back and caudal-fin base.

Cite this page as:
Bray, D.J. 2018, Brachynectes fasciatus in Fishes of Australia, accessed 16 Apr 2024,

Barred Threefin, Brachynectes fasciatus Scott 1957

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Endemic to southern Australia from Wilsons Promontory, Victoria, to the Recherche Archipelago, Western Australia, and northern Tasmania.
Usually occurs amongst seagrass and algal beds in rockpools and on subtidal reefs.


Dorsal fin III + X + 12-13; Anal fin II, 18-19; Pectoral fin 13-14; Caudal fin 13; Pelvic fin I, 2-3; Lateral line scales (upper) 10-12.
Body of moderate length and depth (approx. 25% SL), moderately compressed. Head moderately small (approx. 25% SL), robust and pointed; eyes of moderate size (approx. 28% HL); large, rounded to heavily frilled fleshy tentacle above each eye; anterior nostril tubular with long leafy tentacle; mouth large, reaching to below posterior edge of eyes, slightly oblique; teeth pointed, set in bands, those in outer row of upper jaw enlarged and widely spaced.  
Scales ctenoid, large, covering body, but not head and pectoral fin base; lateral line in two parts, upper section running from upper end of opercular opening, following contour of back, to below end of second dorsal fin, lower section represented by posteriorly notched scales, only some with pores, originating below origin of upper section, curving downwards behind pectoral fin to midline of side, portion below upper section poorly developed and with very few notched scales, those below and behind upper section notched; pores on head large and numerous.  
Dorsal fin in three distinctly separate sections of similar height, first with much shorter base than second, first and second spinous, third with unbranched soft rays and base slightly shorter than that of second; anal fin with elongate base and uniform height; caudal fin rounded. Pectoral fins large, with unbranched rays, rays in lower half strong, middle rays longest, reaching near centre of second dorsal fin. Pelvic fins simple, jugular, inserted posterior to first dorsal fin origin.  

Species Citation

Brachynectes fasciatus Scott 1957, Trans. Roy. Soc. S. Austr. 80: 181, fig. 1. Type locality: Pelican Lagoon, Kangaroo Island, South Australia.


Bray, D.J. 2018


Australian Faunal Directory

Barred Threefin, Brachynectes fasciatus Scott 1957


Fricke, R. 1994. Tripterygiid fishes of Australia, New Zealand and the Southwest Pacific Ocean, with descriptions of 2 new genera and 16 species (Teleostei). Theses Zoologicae 24: 1-585 figs 1-130 

Gomon, M.F. 2008. Family Tripterygiidae. pp. 684-693 in Gomon, M.F., Bray, D.J. & Kuiter, R.H. (eds). Fishes of Australia's Southern Coast. Sydney : Reed New Holland 928 pp. 

Kuiter, R.H. 1993. Coastal Fishes of South-eastern Australia. Bathurst : Crawford House Press 437 pp. 

Kuiter, R.H. 1994. Families Blenniidae and Tripterygiidae. pp. 728-740 in Gomon, M.F., Glover, C.J.M. & Kuiter, R.H. (eds). The Fishes of Australia's South Coast. Adelaide : State Printer 992 pp. 810 figs. 

Last, P.R., Scott, E.O.G. & Talbot, F.H. 1983. Fishes of Tasmania. Hobart : Tasmanian Fisheries Development Authority 563 pp. figs. 

Scott, E.O.G. 1969. Observations on some Tasmanian fishes. Part 16. The Australian Zoologist 15(2): 160-177 figs 1-2 See ref. at BHL

Scott, T.D. 1957. A new blenny (Tripterygiidae) and pipefish (Syngnathidae) from Kangaroo Island, South Australia. Transactions of the Royal Society of South Australia 80: 180-183 figs 1-2 See ref. at BHL

Scott, T.D. 1962. The Marine and Freshwater Fishes of South Australia. Adelaide : Government Printer 338 pp. figs. (as Verconectes fasciatus)

Williams, J. & Holleman, W. 2014. Brachynectes fasciatus. The IUCN Red List of Threatened Species 2014: e.T179039A1562457. Downloaded on 26 June 2018.

Quick Facts

CAAB Code:37415001

Conservation:IUCN Least Concern

Depth:0-13 m

Habitat:Reef associated

Max Size:4.5 cm SL

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