18/02/2026
If you have ever dipped below the Brunswick River surface, you might have found yourself surrounded by these glistening, finned friends!
On a high tide, Diamondfish (_Monodactylus argenteus_) often school just beneath the surface in spots such as along the seawall near the boat harbour, or where Simpson Creek meets the main river channel.
You can recognise them by their iconic diamond shape, the black-tipped, yellowish fins. Float quietly at the surface and you’ll see them plucking away at plankton and detritus.. and if you are patient, they will get more and more comfortable around you!
🌊Special Power🌊
Diamondfish are *euryhaline* (from the Greek _eury_ = “wide” and _hálinos_ = “salt”). This means they can thrive in a variety of habitats, from estuaries to harbours and coastal reefs, thanks to their ability to tolerate large shifts in salinity.
Other common names for this species include *silver butterfish*, *silver moonyfish*, *butter bream*.
Next time you are in the river, keep an eye out and tag us if you spot them! 💎🐟
