The bullrout (Notesthes robusta),[3][2] also commonly called freshwater stonefish or kroki, is a pale yellowish to dark-brown coloured fish that lives in tidal estuaries and slow-flowing streams in eastern Australia, from Southern New South Wales to northern Queensland, Australia.

The bullrout was first formally described in 1860 as Centropogon robustus by the German-born British herpetologist and ichthyologist Albert Günther with its type locality given as New South Wales.

The specific name robusta means "stout" or "full-bodies", an allusion Günther did not explain but which may be due to its more robust body shape when compared to what was thought to be the closely related Eastern fortescue (Centropogon australis).

It is typically encountered within aquatic vegetation or woody debris in still or slow flowing freshwaters where there are rocky, muddy or gravel substrates.

[11] The bullrout is a rather sedentary species in which individuals spend most of the time lying in wait on the bottom or among weeds for prey to pass,[2] it is an ambush predator feeding on fishes and small crustaceans.