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any of certain marine fishes of the genus Tetrapterus, family Istiophoridae (order Perciformes). Spearfishes are characterized by a relatively short snout in comparison with other spear-nosed fishes. Several species may be recognized; two, T. audax and T. albidus, are commonly called marlin (q.v.). The shortbill, or short-nosed, spearfish (T. angustirostris or T. brevirostris) is a Pacific member of the genus-scarce, little-known, and rather small for a billfish. Blue above and silvery below, it usually does not exceed 1.8 m (6 feet) and 27 kg (60 pounds). The species T. belone is a Mediterranean form resembling T. angustirostris.