swordfish

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swordfish,

large food and game fish, Xiphias gladius, of the warmer Atlantic and Pacific waters. It is named for its sharp, broad, elongated upper jaw, which it uses to flail and injure its prey of smaller fish. Swordfish breed as far north as Nova Scotia; they are often seen basking on the water's surface, and their fins are sometimes mistaken for those of sharks. They may reach 15 ft (457 cm) and 1,000 lb (450 kg); however, specimens half this size are considered large. Swordfish were formerly harpooned commercially but now are taken using long lines with multiple baited hooks. Conservation efforts are underway to rebuild depleted stocks. Swordfish are classified in the phylum ChordataChordata
, phylum of animals having a notochord, or dorsal stiffening rod, as the chief internal skeletal support at some stage of their development. Most chordates are vertebrates (animals with backbones), but the phylum also includes some small marine invertebrate animals.
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, subphylum Vertebrata, class Actinopterygii, order Perciformes, family Xiphiidae.

Swordfish

 

(Xiphias gladius), the only modern representative of the family Xiphiidae of the order Perciformes. The upper jaw is extended into a swordlike projection. There are no ventral fins. The naked body is up to 4 m long and weighs up to half a ton. The swordfish is found in all oceans, primarily in the tropics; it is also encountered in arctic latitudes in the north. In the USSR the fish is found in the Black, Baltic, and Barents seas, as well as in the Sea of Japan and the Sea of Azov. Swordfish generally are solitary animals. Mating occurs in the warm season; the roe are pelagic. Swordfish feed on nektons, including squids, tuna, and sharks. They are commercially valuable.

Swordfish

[′sȯrd‚fish]
(astronomy)

swordfish

a large scombroid fish, Xiphias gladius, with a very long upper jaw: valued as a food and game fish: family Xiphiidae
References in periodicals archive ?
Synopsis of the biology of the Swordfish, Xiphias gladius Linnaeus.
Food and Agriculture Organization of the United Nations species codes are used: SWO=swordfish (Xiphias gladius); DOL=dolphinfish (Coryphaena hippurus); BSH=blue shark (Prionace glauca); GES=snake mackerel (Gempylus serpens); ALX=longnose lancetfish (Alepisaurus ferox); and LEC=escolar (Lepidocybium flavobrunneum).
Asociacion entre la Corriente de Deriva de los vientos del Oeste y la abundancia relativa del pez espada (Xiphias gladius) frente a la costa de Chile.
Specimens of this species from ML 100-350 mm are common in stomach contents of swordfish (Xiphias gladius) in oceanic waters off Chile between 32[degrees]S-8[degrees]S and 80[degrees]W-5[degrees]W (Ibanez et al., 2004; Castillo et al., 2007).
Hierarchical analyses of genetic variation of samples from breeding and feeding grounds confirm the genetic partitioning of northwest Atlantic and South Atlantic populations of swordfish (Xiphias gladius L.).
cavirostris that also has been identified in the stomachs of Swordfish (Xiphias gladius) caught off western Baja California, Mexico (Markaida and Hochberg 2005).
El estudio de vertebras fue determinante para la identificacion taxonomica en especimenes de Xiphias gladius, pues estas poseen rasgos muy caracteristicos y propios que la diferencian de las otras especies de la familia Istiophoridae (Gregory y Conrad 1937; Nakamura 1985).
Some fast-swimming fish have a concave forebody too (e.g., the Mediterranean spearfish Tetrapturus belone, Indo-Pacific sailfish Istiophorus platypterus, black marlin Makaira indica, or swordfish Xiphias gladius).
The great white shark has large, triangular, highly serrated teeth, ideal for cutting up hard bones of marine mammals and large fishes such as adult bluefin tunas (Thunnus thynnus), swordfishes (Xiphias gladius) and sharks; the teeth in the upper jaw are broader than those in the lower jaw.