Robust Assfish, Bassozetus robustus Smith & Radcliffe 1913

Robust Assfish, Bassozetus robustus. Source: NORFANZ Founding Parties. License: All rights reserved

Cite this page as:
Bray, D.J. 2018, Bassozetus robustus in Fishes of Australia, accessed 02 Mar 2024,

Robust Assfish, Bassozetus robustus Smith & Radcliffe 1913

More Info


Off central Queensland, to off Sydney, New South Wales, at depths of 1190-1800 m; also on the Lord Howe Rise and the Norfolk Ridge in the Australian EEZ. Occurs elsewhere in the Atlantic, Pacific and Indian Oceans at depths of 1035-4420 m (usually 1069-1922 m).


Dorsal fin 115-123; Anal fin 94-102; Vertebrae 64. 
Snout inflated; eye much smaller than snout; opercular spine weak or absent; preopercle without spines and posteriorly expanded almost reaching posterior margin of opercle; pseudobranchial filaments 2. 


Species of the family Ophidiidae are oviparous (egg layers) with pelagic eggs and larvae. Eggs are oval and float in a gelatinous mass.


Bray, D.J. 2018

Robust Assfish, Bassozetus robustus Smith & Radcliffe 1913


Nielsen, J.G., 1997. Deepwater ophidiiform fishes from off New Caledonia with six new species. No. 4. In B. Séret (ed.) Résultats des Campagnes MUSORSTOM, 17. Mem. Mus. Natl. Hist. Nat. (MMNHN) 174: 51-82.

Nielsen, J.G. 2010. Bassozetus robustus. The IUCN Red List of Threatened Species 2010: e.T154973A4680674. Downloaded on 16 March 2017.

Nielsen, J.G., D.M. Cohen, D.F. Markle & C.R. Robins. 1999. Ophidiiform fishes of the world (Order Ophidiiformes). An annotated and illustrated catalogue of pearlfishes, cusk-eels, brotulas and other ophidiiform fishes known to date. FAO Fisheries Synopsis 125(18): 178 pp. Rome: FAO.

Nielsen, J.G. & N.R. Merrett. 2000. Revision of the cosmopolitan deep-sea genus Bassozetus (Pisces: Ophidiidae) with two new species. Galathea Report 18: 7-56.

Tomiyama, S., Takami, M. & Fukui, A. 2016. Redescription of Bassozetus compressus (Günther 1878), a senior synonym of Bassozetus elongatus Smith and Radcliffe 1913 (Ophidiiformes: Ophidiidae).  Ichthyological Research 63(2): 218-226.

Tomiyama, S., Takami, M. & Fukui, A. 2016. A new deepwater assfish, Bassozetus nielseni sp. nov. (Ophidiiformes: Ophidiidae), from the North Atlantic and West Indian oceans. Ichthyological Research abstract, published online on 20 Feb 2018, 10pp.

Yeh, H.-M., Lee, M.-Y. & Shao, K.-T. 2005. Fifteen Taiwanese new records of Ophidiid fishes (Pisces: Ophidiidae) collected from the deep waters by the RV Ocean Researcher I. Journal of the Fisheries Society of Taiwan 32(3): 279-299.

Quick Facts

CAAB Code:37228053

Conservation:IUCN Least Concern

Depth:1035-4420 m


Max Size:64 cm SL

Species Image Gallery

Species Maps

CAAB distribution map