Swordfish has a typical streamlined body with smooth surface, long and sharp upper jaw, small fins on the back, flat mouth and no gills and ventral fins. Swordfish have different colors, and generally the fish back and body are brown and black. The average weight of swordfish is 68 ~113kg, the average length is 2. 1 m, and the mouth accounts for 1/3 of its body length. The main food of swordfish is other fish and squid. Swordfish is distributed in all oceans except the Arctic Ocean, and it is also a major food fish with important fishery value.
When swordfish swims forward, the powerful tail handle can produce great impetus, and the long jaw like a spear plays the role of splitting water. Swordfish, which travels at a high speed of 130 km per hour, can pierce the thick bottom of the ship with its hard upper jaw. In the London Museum in England, there is a wooden boat bottom with a thickness of 50 cm that was pierced by the swordfish "long sword".
Swordfish, also known as "swordfish", has a short and strong body, a short and thin tail handle, and a developed central ridge on each side, without other small ridges. The snout is extended forward into a flat and sharp sword-like protrusion. The eyes are big and the teeth are small, which gradually disappear with growth, while the adult fish has no jaw teeth. Gillless harrow The base of the first dorsal fin is short and triangular, which is far away from the second dorsal fin, which is small and located at the back of the body. Low pectoral fin; No ventral fin; The caudal fin is deeply forked and powerful, and there is a deep depression at the end of the caudal stalk. The back and sides of the body are dark brown, and the ventral side is light brown. The fin membrane of the first dorsal fin is dark brown, and the remaining fin is brown or dark brown.