The channelled rockfish (Setarches guentheri), commonly known as the deepwater scorpionfish, is a marine ray-finned fish belonging to the subfamily Setarchinae, which is a part of the family Scorpaenidae.

The channelled rockfish was first formally described in 1862 by the English zoologist James Yate Johnson with the type locality given as Madeira.

[5] This was later re-examined and 3 species were accepted as belonging to the genus Setarches: S. armata, S. guentheri and S.

The lateral line is almost continuous and is a trough covered by thin membranous scales, which are deciduous.

[2] Living specimens are pinkish red to orange with reddish black spots on the head and body.

In the Gulf of Mexico, the diet is dominated by benthic crustaceans, like the shrimp and prawns in the genus Oplophorus and a variety of amphipods.