The grunt sculpin or grunt-fish (Rhamphocottus richardsonii) is a small fish mainly found in the eastern Pacific Ocean.

[2] The grunt sculpin generally remains close to shore and is often found in empty giant barnacle shells.

[3][4] The short, stout body of the grunt sculpin has a long, small mouth which is adapted for eating smaller prey.

Its main features are its big head, short, stout body, long pig snout, and orange fins.

[2][9] In these regions, the grunt sculpin resides in a variety of habitats such as rocky shores, kelp forest, sandy beaches, and reefs.

R. richarsonii tend to attack with lower velocities and from shorter distances (less than half its body length away) in comparison to other Cottidae fishes.

The female is the dominant mate in reproduction and will chase and trap the male within a rocky crevice until she has laid all her eggs (about 150).