Diamondfish, Monodactylus argenteus (Linnaeus 1758)

Other Names: Butter Bream, Butter-Bream, Butterfish, Butter-fish, Diamond Fish, Diamond-fish, Silver Batfish, Silver Moony

A Diamondfish, Monodactylus argenteus, South Solitary Island, New South Wales, April 2006. Source: Sascha Schultz / iNaturalist.org. License: CC by Attribution-NonCommercial


The aptly-named Diamondfish is silvery with black to dusky leading edges and blackish fin tips on the dorsal and anal fins. Small juveniles have a yellow dorsal fin and two vertical bars on the head.

Video of Diamondfish at Pender Bay, Dampier Penninsula, Western Australia.

Cite this page as:
Bray, D.J. 2020, Monodactylus argenteus in Fishes of Australia, accessed 24 Feb 2024, https://fishesofaustralia.net.au/home/species/581

Diamondfish, Monodactylus argenteus (Linnaeus 1758)

More Info


Port Hedland, Western Australia, around the tropical north to Mallacoota, Victoria. Elsewhere the species occurs in the tropical, Indo-west Pacific.  

Inhabits bays and harbours, mangrove estuaries, river mouths, inshore marine areas, tidal creeks and streams. Common around jetties and wharf pilings. Juveniles common in estuaries, often entering the lower reaches of freshwater streams.


To 25 cm SL (standard length) and 27 cm TL (total length).


Feeds on plankton and detritus.


Of minor commercial importance.


  • EPBC Act 1999 : Not listed
  • IUCN Red List : Not Evaluated
  • Species Citation

    Chaetodon argenteus Linnaeus, C. 1758. Systema naturae  I: 272. Type locality: Indies.


    Bray, D.J. 2020


    Atlas of Living Australia

    Diamondfish, Monodactylus argenteus (Linnaeus 1758)


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  • Quick Facts

    CAAB Code:37356002

    Conservation:IUCN Least Concern

    Depth:0-18 m

    Habitat:Reef associated

    Max Size:27 cm SL

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