Patagonotothen brevicauda, the Patagonian rockcod, is a species of marine ray-finned fish, belonging to the family Nototheniidae, the notothens or cod icefishes.

It is native to oceans of the Patagonian region, including Tierra del Fuego, the Strait of Magellan, the Beagle Channel and the Falkland Islands.

[2] This taxon is regarded as a valid species by both FishBase and Catalog of Fishes, Patagonotothen shagensis.

[2] This demersal species inhabits shallow, gravelly seabeds of depth range 5–8 m (16–26 ft).

Cephalopods, bryozoans, mytilids, hydrozoans, thaliaceans, isopods and polychaetes are also consumed to a lesser degree.