March 25 (Lunar calendar: Leap February 04), 2023 Saturday | Dawnxisoul393art
A series of "Hong Kong" and ocean's most...
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Why is the sailfish the fastest swimming fish in the world?
- A topic arising from the development of "SNAPP" at HKU
Developed and designed by the Department of Mechanical Engineering at the University of Hong Kong, the fast-swimming "SNAPP" is a robotic fish that can stay underwater for 8 to 12 hours and can be used for drowning rescue, and currently, holds the Guinness World Record set in 2020 for swimming a 50-meter underwater course in 22.92 seconds. This is faster than Phelps, who won eight gold medals and broke four swimming world records at the 2008 Beijing Olympics. SNAPP is the fastest robotic fish to date, with a speed of 2.18 m/s, breaking the known scientific boundaries of human swimming.
In the real world of the ocean, what fish is the fastest swimmer in the world? The answer is the "sailfish". But why the sailfish?
The sailfish is the fastest swimming fish in the Guinness Book of World Records. The sailfish is known as the "champion swimmer" and is recognized as the fastest swimming fish over short distances. Its average swimming speed is about 110 kilometers per hour, with the fastest speed reaching 190 kilometers per hour. The speed of sailfish is sometimes much faster than the speed of a boat. This is due to the special body structure of sailfish. During the long evolutionary process, the body structure of sailfish became more and more suitable for them to swim in order to adapt to life in the ocean. The sailfish's body is flat from the outside and has an overall streamlined shape, so they have very little resistance when swimming, which allows them to swim faster. Sailfish have two dorsal fins: the first one is high and soft and looks like a large flag flying in the wind, which can be folded and stretched freely, hence the name sailfish.
Behind the handsome and majestic sailfish we see, there is actually a painful "blood and tears" history, from killing each other as children to growing up and facing many ocean giants and swimming between oceans for a living. The female sailfish also worries about reproducing her offspring, and when it comes to spawning time, she adopts a strategy of winning with numbers, laying more than one million eggs each time. But survival in the sea is so difficult that almost most sailfish eggs do not survive childhood, and although they feed on tiny plankton, many times food is in short supply, so it appears that the larger sailfish eat the smaller ones. Here is the race against time, who grows fast, who can go farther in life.
In just one week, the small sailfish can grow to about 10 cm, from the size of a rice grain fry, to a body length of three or four meters, weighing one or two hundred kilograms, ten thousand times the growth rate is not anyone can reach. The most difficult hurdle for young sailfish is the first year, if they survive, they have to pass the second hurdle, which is the natural elimination in the next 4-6 years, and the last survivor is qualified to become the top predator in the ocean community. After becoming the dominant, sailfish cannot be done once and for all, still, they have to keep running between the major currents in order to survive the most basic, because only here, it is easier to find fish.
Sailfish know how to work as a team and realize the importance of teamwork. When schools of fish are present, groups of sailfish will cooperate with each other to catch fish together and achieve a win-win ending. Through the course of tens of millions of years of evolution, sailfish have joined forces not only with conspecific groups to besiege schools of fish but also with other different animal species to fish together, with sailfish schools driving schools of sardines downstream and frigate birds intercepting them upstream so that both sides can eat fresh and plentiful food.
When sailfish launch an attack, the power, and destructive force is comparable to that of armor-piercing bullets. When faced with tough animals such as the shell of a sea turtle or the spine of a gray mackerel, sailfish don't even take them seriously. With the support of a variety of empowerment, sailfish perfectly out of their own berserk path.
The most can feel the sailfish berserk character is human. Humans often think they are the master of the world, but come to the sea will find that many fish in the water can easily hunt humans, sailfish attacks on humans always occur frequently. The Museum of London, England, still retains a piece of wood pierced by sailfish, the thickness of this piece of wood surprisingly reached 50 cm. Even in the face of the steel plate of the giant ship, sailfish also pierced a hole in it like a lamb kebab. If the steel plate of the giant wheel is not strong enough, then the steel plate of the submarine shell is thick enough to withstand the huge water pressure of the deep sea, which is unparalleled in all aspects, even so, it cannot resist the irascible attack of the sailfish.
Original by Dawnxisoul393
SM-2) Why is the sailfish the fastest swimming fish in the world? - A topic arising from the development of "SNAPP" at HKU
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