Commonly known as: swordfish, swordfish diced, four swordfish.
Latin scientific name: swordfish Linne.
English name: swordfish
Classification: Sailfish is a class of fish, Sailfish Family.
Appearance characteristics: 3 meters long, 900 kilograms in weight, and the upper jaw protrudes like a sword. The kiss is as long as an arrow, thick, spindle-shaped, and the back and abdomen are blunt and round. The tail handle is thick and flat, with a developed protrusion on each side. Big head. The kiss consists of the front jaw and the nasal bone, extending forward, such as arrow-shaped, flat and flat, with large eyes, upper position and wide and flat eye intervals. The mouth is big and the jaw is short. Adult fish have no teeth (young fish have fine teeth), and their jaws and tongues have no teeth. The front gill cover is serrated (young fish have teeth). The skin of adult fish is bare, scaly and rough, and the lateral line is not obvious. Two dorsal fins. Maebetaka, the first dorsal fin, is a spinnaker, and the fin behind 14 fin is very short, which is contained in the dorsal groove and is not exposed. The second dorsal fin is short and low, located in the caudal stalk and two anal fins. The first gluteal fin is large and located at the back of the body, and the second buttock is isomorphic with the second dorsal fin. The head and back are blue-purple, and the abdomen is light black with no markings. Each fin is dark blue, shining with silver.
Breeding habit: Adult fish can reach 5 meters in length and weigh more than 400 kilograms. The age and growth of swordfish are still unknown. The minimum body length of individuals in the breeding population is 1.39 meters, and the body length (from eye to tail fork) is 0.5-2.8 meters. A fish whose body length is less than 1.3m is not mature individuals. According to calculation, the body length of swordfish in the western Pacific grows by an average of 25 cm per year. The ratio of men to women is roughly equal. Oviposition occurs almost all year round, mainly from March to July in the northern hemisphere and from 65438+ 10 in the southern hemisphere. Swordfish spawn floating eggs, the egg diameter is 1.63- 1.68 mm, and the diameter of single oil ball is 0.40mm.. When the water temperature is 22.5-25.2℃, the ovulation time is about 70 hours, and the first egg is 4.0 mm long. After about 7-8 days and nights, the eggs are completely absorbed. The camp actively feeds on small zooplankton, chasing vertebrates such as zooplankton when the body length exceeds 100 mm, and adult fish feed on pelagic fish such as mackerel, pike and cephalopod, and deep-sea fish such as cod, flounder and bottle fish.
Living water layer: a rare pelagic fish with warm water in the ocean.
Endangered levels are rare.
Anecdotes related to swordfish
Swordfish can be regarded as the swimming champion in the ocean. The average speed of swimming can reach 28 meters per second, which is far behind even the fastest boat.
Swordfish have a fierce temperament. It is said that the British oil tanker "Barbalat" sailed in the Atlantic Ocean during World War II. The crew suddenly saw a slender black thing in the distance and quickly rushed to the tanker. In an instant, there was a deafening noise; Then, the sea water poured into the cabin from a big hole. Was the tanker torpedoed? No, but it was attacked by swordfish. Swordfish penetrated the ship's side with a sharp sword protruding from the upper jaw. When it pulled out the "long sword", it stabbed twice in a row. Finally, the swordfish was unable to pull out its "long sword" and obediently became a prisoner. That sounds legendary. However, it is quite common for swordfish to attack ships and pierce their swords into the hull. There are some strange exhibits in the British museum. Among them, there is a swordfish "sword", which is 30 cm long and has a circumference of 12.7 cm, and is embedded in the middle of a 34 cm thick board of a whaling ship; There is also a 55.8 cm thick board, which was pierced by swordfish.
Swordfish feed on fishing. When it chased the fish, it ran on the rampage with its "sword" that could penetrate the steel plate. The person who hit it was either dead or injured, and then it slowly swallowed it.
Animals living in water swim at different speeds because of their different species and lifestyles. 1967, the Soviet Union (now the Commonwealth of Independent States) published a "speed comparison table of animals in the sea". Among them, whales: whales 55 km/h, fin whales 50 km/h, killer whales 65 km/h and sperm whales 22 km/h; Pinpoda: seal 354 Li/h, walrus18-20km/h; Fish: swordfish 130km/h, swordfish 120km/h, flying fish 65km/h, shark 40km/h; Cephalopods: squid 4 km/h, cuttlefish 26 km/h, octopus 15 km/h From this statistical table, swordfish swims fastest.
Why does swordfish swim at such a high speed? It turns out that it has a very typical streamlined body, a smooth body surface, a long and sharp upper jaw, and a strong tail handle can produce great impetus. When it swims fast forward, its long jaw like a spear plays the role of splitting water. Swordfish moves at a high speed of 130 km per hour, and its hard upper jaw can pierce the thick layer of the bottom of the ship!
In the London Museum in England, there is a boat bottom pierced by swordfish "long sword", and the wooden board at the bottom of the boat is 50 cm thick.
Swordfish, also known as swordfish, is named after its flat upper mandible, thick in the middle and thin on both sides, like a sword. But because of its fast speed, such as an arrow leaving the string, it is called swordfish.
The fast swimming shape of swordfish provides a living blueprint for aircraft designers. The designer imitated the shape of swordfish and installed a long "needle" in front of the plane. This long "needle" pierced the "sound barrier" produced in the high-speed progress, so the supersonic plane came out. The appearance of high-speed aircraft is also a great success of bionics.