The Drysdale grunter (Syncomistes rastellus) is a species of ray-finned fish in the family Terapontidae.

It is endemic to Australia, where it occurs in the Gibb and Drysdale Rivers, coastal rivers in northern Western Australia.

[2] It is a herbivorous species which grazes on filamentous algae and prefers the main river channels rather than the tributaries, it also prefers flowing water of varying turbidity and substrate.

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