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Marlin is the common name for a large marine fish in the family Swordfish of the order Perciformes.

Fish in this family are widely distributed in the family Fish with an extended laterally compressed body, stout and powerful, with a high head tapering backward and a strong caudal peduncle.

Marlin? The body is covered with small ribbed scales, and the skin is thick and coarse like leather. The upper mandible protrudes forward like a spearhead, and its lateral margins are bluntly rounded. Dorsal fins 2, the first dorsal fin from the back of the head straight to the tail like a sail, and small second dorsal fin close. The anal fins are 2, the caudal fin is large and y forked, the pectoral fins are sickle-shaped, and the caudal peduncle has 2 elevated angular ridges on each side.

The swordfish, commonly known as the swordfish, the sword sailfish, the Dingbats four sailfish, is also known as the green swordfish. It is a flying fish belonging to the class Ichthyoplasmata, order Perissodactyla, family Swordfish. The upper jaw of the swordfish is sharp and long, like a sharp sword, straight forward. Its body is prismatic, back dark brown, belly silver gray, 4-5 meters long, the longest up to 6 meters, weighing about 300 kilograms, for one of the large fierce fish. Swordfish is often active in the upper and middle water layers, swimming, often the head and dorsal fins exposed to the surface, with the sword-like upper jaw splitting the water forward, the speed is very fast, up to 119 kilometers per hour, for the general train speed of about twice.