Bludger Trevally, Turrum gymnostethus (Cuvier 1833)

Other Names: Bleeker's Jackfish, Bludger, Nakedbreast Trevally

Bludger Trevally, Turrum gymnostethus, at Mornington Island. Source: Rick Stuart-Smith / Reef Life Survey. License: CC By Attribution

A green to bluish-green trevally becoming silvery-white below, sometimes with small brown to golden spots (usually less than 30) scattered on the mid-sides, olive green dorsal, anal, caudal and pelvic fins, and often white tips on the soft dorsal and anal fins. Juveniles to 200 mm are silver to silvery-green with a few scattered golden spots on the side, and a dark line running obliquely through the eye that fades with age.
This species was previously known as Carangoides gymnocephalus.

Cite this page as:
Bray, D.J. 2022, Turrum gymnostethus in Fishes of Australia, accessed 29 May 2024,

Bludger Trevally, Turrum gymnostethus (Cuvier 1833)

More Info


Widespread in northern Australia, from Ningaloo Reef, Western Australia, to Moreton Bay, Queensland. Elsewhere the species occurs in the tropical, Indo-west Pacific from South Africa to New Caledonia, and north to the Ryukyu Islands, Japan. Adults prefer deeper offshore reefs.


Dorsal fin VIII + I, 28-33; Anal fin ll + I, 24-27; Gill rakers 7-9 + 19-22 = 28-31; Lateral line (straight part) 20-31 small scutes.
Naked area on breast extending up to, but not above, pectoral-fin base; head profile relatively steep in small juveniles (less than 150 mm LCF) becoming less steep with age, large adults elongate with very shallow head profile (angle of head with the horizontal axis of the body 33-42°). Curved portion of lateral line gently to moderately arched, with junction of curved and straight parts below 16th to 20th ray of 2nd dorsal fin.


than straight part. Colour: Adults olive-green above, silvery white below with a few brown or golden spots sometimes present midlaterally; opercular spot dusky and inconspicuous; dorsal, anal and caudal fins pale olive-green to greenish 


Juveniles to 200 mm are silver to silvery-green with a few scattered golden spots on the side, and a dark line running obliquely through the eye, fading with age. Larger individuals are green to bluish-green above, silver below, with or without gold to golden brown spots (usually less than 30) scattered on the sides, olive green dorsal, anal, caudal and pelvic fins, and often white tips on the soft dorsal and anal fins. 


Feeds on crustaceans and small fishes.


Taken in artisanal fisheries and by recreational fishers throughout its range.


Similar Species

This species is often misidentified as Carangoides fulvoguttatus.


The specific name gymnostethus is from the Greek gymnos (= bare, naked) and stethos (= breast, chest) in reference to the lack of scales on breast.

Species Citation

Caranx gymnostethus Cuvier in Cuvier & Valenciennes 1833, Histoire Naturelle des Poissons 9: 73. Type locality: Seychelles.


Bray, D.J. 2022


Atlas of Living Australia

Bludger Trevally, Turrum gymnostethus (Cuvier 1833)


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Cuvier, G.L. in Cuvier, G.L. & Valenciennes, A. 1833. Histoire Naturelle des Poissons. Paris : Levrault Vol. 9 512 pp. pls 246-279. See ref at BHL

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Smith-Vaniz, W.F. & Williams, I. 2016. Carangoides gymnostethus. (errata version published in 2017) The IUCN Red List of Threatened Species 2016: e.T20429774A115374026. Downloaded on 23 July 2017.

Whitley, G.P. 1947. New sharks and fishes from Western Australia. Part 3. The Australian Zoologist 11(2): 129-150 figs 1-3 pl. 11 (as Ferdauia claeszooni var prestonensis, type locality sixteen miles north of Cape Preston, Western Australia) See ref at BHL

Quick Facts

CAAB Code:37337022

Conservation:IUCN Least Concern

Depth:0-100 m

Fishing:Commercial/recreational fish

Habitat:Reef associated

Max Size:90 cm TL

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