Any of various dark-coloured fish of the Old World, especially the rudderfish (Centrolophus niger).
The Atlantic salmon, Salmo salar, especially a female after spawning.
A pilot whale, genus Globicephalus (occasionally also used for various other whales).
Any of various dark-coloured fishes of Australasia, especially the luderick, Girella tricuspidata, and a freshwater fish, Gadopsis marmoratus.
Either of two dark-coloured fish of the west Atlantic, the tautog of New England (Tautoga onitis) and the black sea bass (Centropristis striata).
To go fishing for blackfish.
To adopt signifiers of black identity (for example, by darkening the skin, or wearing traditionally black hairstyles).
Any dark-skinned person: originally specifically an Indian, but later also anybody of North African, Mediterranean, or Middle Eastern ancestry.
A bug, an insect.
A person of Southern European, Mediterranean, Middle Eastern, or Southeastern European ancestry.
A pollywog, or sailor who has never crossed the Equator.
A minor illness caused by bacteria, virus, intestinal parasite, etc.
A person who is not a Scientologist.