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.

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

[10] It is a benthopelagic species which has a depth range of 150 to 780 m (490 to 2,560 ft) over soft bottoms and with a water temperature between 5.5 to 12.5 °C (41.9 to 54.5 °F).

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.