Trematomus is a genus of cod icefishes native to the Southern Ocean, with these currently recognized species:
Trematomus bernacchii Boulenger, 1902 (emerald rockcod)Trematomus eulepidotus Regan, 1914 (blunt scalyhead)Trematomus hansoni Boulenger, 1902 (striped rockcod)Trematomus lepidorhinus (Pappenheim, 1911) (slender scalyhead)Trematomus loennbergii Regan, 1913 (scaly rockcod)Trematomus newnesi Boulenger, 1902 (dusky rockcod)Trematomus nicolai (Boulenger, 1902) (spotted notothen)Trematomus pennellii Regan, 1914 (sharp-spined notothenia)Trematomus scotti (Boulenger, 1907) (crowned rockcod)Trematomus tokarevi Andriashev, 1978 (bigeye notothen)Trematomus vicarius Lönnberg, 1905 (orange notothen)
