Any of various dark-coloured fish of the Old World, especially the rudderfish (Centrolophus niger (species)).
A pilot whale, genus Globicephalus (genus) (occasionally also used for various other whales).
Either of two dark-coloured fish of the west Atlantic, the tautog of New England (Tautoga onitis (species)) and the black sea bass (Centropristis striata (species)).
Any of various dark-coloured fishes of Australasia, especially the luderick, Girella tricuspidata (species), and a freshwater fish, Gadopsis marmoratus (species).