Sailfish is a large and fierce carnivorous fish in the ocean. It has round eyes, a large mouth, and a long protruding snout. It is shaped like a sharp sword and is a powerful offensive weapon. The body of the swordfish is round and thick, spindle-shaped, two to three meters long, about 10 times as long as the body, and the tail is in the shape of an "eight", like a scythe. The back of its head is blue-purple, its belly is light black, and its sides are covered with small silvery round spots. Swordfish have two separate fins. The first dorsal fin is soft and tall, and looks like a large flag fluttering in the wind, which can be folded and stretched freely. The second dorsal fin is short and low, located at the caudal peduncle. Whenever it flows rapidly, the swordfish folds its large flag-shaped dorsal fin and hides it in the sunken groove on its back to reduce the resistance to swimming forward, thus earning it the title of "swimming champion". Once the swimming speed needs to be slowed down, it can also raise a "big flag" to increase swimming resistance. There are more than 20,000 kinds of fish in the world. After years of observation, people have discovered that swordfish is the fastest swimming fish, with a speed of up to 28 meters/second. No fish has yet been found to break this record. Sailfish like to float on the surface of the water, with their flag-shaped dorsal fin and sickle-shaped tail fin exposed out of the water, showing off their power and cruising around. When it hunts other marine fish, it often uses its long, sharp sword-like snout and fast swimming speed to rush into schools of fish, poking here and there, chasing and killing them. After a while, the sea surface is stirred up with blood, and the fish are Corpses float. Then, it started to eat and had a full meal. Sailfish can not only attack large whales, but also attack ships. They are regarded as ruthless murderers in the ocean. Sailfish spawn nearly all year round. It usually lays eggs in the southern hemisphere sea areas in January every year, and mainly goes to the northern hemisphere sea areas from March to July. The eggs are about 1.6 mm in diameter and will hatch after about a few days. The body length of newly hatched fish can reach 4 mm. When they grow to 10 centimeters, they can eat the juveniles of other fish. According to calculations, the average annual increase in body length of swordfish is about 25 centimeters, and its mature body length is more than 1-3 inches. Sailfish mainly lives in the tropical and tropical waters of the Pacific, Atlantic, and India, and is also found in the South China Sea in my country.