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.
Flag fish is tender and plump, and its muscles have different colors, such as white, reddish, bright red, etc. It has high nutritional value and is a high-grade fish ingredient. Perciformes is an important food fish and fishing in the genus Istiophoridae, which is widely distributed in tropical and subtropical waters all over the world. China is found in the South China Sea islands.
Sailfish is covered with needle-like scales. The lateral line is complete, gradually bending downward above the pectoral fin and then extending straight to the tail. The caudal fin is deeply forked, and the dorsal fin is long and wide. Sometimes, with the help of the wind, swimming speed can be accelerated. The dorsal side of the head and body is bluish-blue, with horizontally arranged gray-white round spots on the dorsal side, and the abdomen is silvery-white. Except the gray of the gluteal fin, all the fins are blue-black, and the fin membrane of the first dorsal fin is densely covered with black round spots.
The kiss extends in a long circle and spear shape, which is different from related species such as marlin in that the body is slender and the ventral fin is long, especially the dorsal fin is as wide as a sail. The body is dark blue, the ventral part is silvery white, and the dorsal fin is bright blue and spotted. Mainly eat fish, crustaceans and cephalopods.