Blackfish, a popular name loosely applied to several fish of black or dusky hue, and sometimes improperly used to denote small whales and dolphins. In England the name is chiefly given to Centrolophus pompilus. a perciform fish of the acanthopterygian family Stromateidae, found in European seas, and occasionally reaching our south coast, Yarrell records a specimen 32 inches in length, and 14 lbs. in weight, but individuals of this size are rare. There is another British species (C. britannicus). In America the name is given to the genus Centropristis, and to the Tautog (q.v.).