Fish Age Judgement Method
The common way to determine the age of a fish was as follows: ** 1. Scale Technique ** 1. ** Principle ** - Fish scales were composed of horniness and calcium, and grew larger as the fish grew. Its growth is affected by season, temperature, food and other factors. In the growing season (spring and summer), it grows fast, and the scales add new cell layers quickly, forming a wide and light-colored growth zone; in the non-growing season (autumn and winter), it grows slowly, forming a narrow and dark rest zone. A pair of growth zones and rest zones formed the annual rings. 2. ** Operation and application ** - Take a scale of a fish and observe it under a microscope or magnifying glass. Count the number of black ring-shaped stripes (growth rings) on the scale and add 1 to the actual age of the fish. This method was simple and did not affect the survival of the fish. It was suitable for most scaly fish species. In the 1950s, China began to use this method to determine the age of common economic fish such as carp, grass carp, and carp in rivers and lakes. Later, it was also used to study the age of important economic fish such as yellow croaker, yellow croaker, and hairtail in the ocean. However, the scales may be damaged or fallen off, the growth rings may be irregular or unclear, and there may be regeneration or replenishment phenomena, which will affect the accuracy. During the operation, healthy, complete, and representative scale samples shall be selected, and standardized processing and reading methods shall be adopted for verification. ** 2. Otolith Method ** 1. ** Principle ** - Otolith is located in the inner ear of fish and is composed of calcium carbonite and organic matter. Its growth is affected by factors such as season, temperature, and food. In the growing season, the otolith increased the new cell layer quickly, forming a wide and light-colored growth zone; in the non-growing season, it was slow, forming a narrow and dark-colored rest zone. A pair of growth zone and rest zone formed the annual ring. 2. ** Operation and application ** - The age of the fish was estimated by counting the growth rings on the otolith. The method was relatively simple to operate and was suitable for scaleless or small fish species, which could reflect the true age. In China, it was mainly used to determine the age of large-scale economic fish and deep-sea fish such as tuna, sharks, and codfish. However, the otolith may be damaged or missing, the growth rings may be irregular or unclear, and there may be invisible or false growth rings. When using it, healthy, complete, and representative otolith samples should be selected, and standardized processing and reading methods should be used for verification. ** 3. Bone Technique ** 1. ** Principle ** - Using the growth rings formed on the hard bone structures of fish (such as spine, back spine, chest spine, abdominal spine, ribs, etc.) to calculate age. 2. ** Operation and application ** - It is suitable for scaleless or small-scaled fish species such as catfish and salmon. ** 4. Length-frequency Method ** 1. ** Principle ** - The age of the fish was calculated by the length distribution characteristics of the fish. In addition, when the scales were not clear, the age of the fish could also be estimated based on the vertebrae, operculum, and dorsal fin. For example, flatfish could use the vertebrae, salmon could use the operculum, sharks could use the dorsal fin, and large and small yellow croakers could use otolith to calculate the age. There were also methods to estimate the age of a fish by observing its appearance, and there was also a saying that the age of a fish could be determined by its diet, but the latter two methods were relatively less scientific and accurate. The novel "Watching the Moon on Fish Island" is equally exciting. Everyone is welcome to click and read it!
The night is blowing with the cold wind
The original singer of "The Cold Wind Blows at Night" was Liu Xiaochao. "Luo Han's Lyric Collection" is equally exciting. Everyone is welcome to click and read it!
I feel that there is something in the corner of my eye that is very painful. What should I do if I shed tears? What medicine should I use?
There were many reasons for the tingling sensation at the corner of the eye and the tears flowing. The medication used was different for different causes. If it is chronic dacryoiditis, it may be accompanied by pus secretion, which requires lacrimal passage probing and lacrimal passage rinsing treatment. If probing is unsuccessful, surgery for dacryoiditis can be performed, or medication can be used. If it is allergic chondritis, accompanied by redness, anti-allergic drugs such as azelastine acid eye drops can be used. If it is bacteria keratis, accompanied by eye pain and increased pus secretion, anti-infective drugs such as levofloaxin eye drops and eroxin eye ointment can be used. If it was sinutis, it could be treated with levofroxaxin eye drops, Yanlishuang eye drops, oral administration of imolactone soft capsules, external use of imolactone eyesight solution, or with ofroxaxin eye drops and Fenbid capsules. If it was caused by Trachoma, eye drops could be used to treat Trachoma. If such symptoms occur, they should immediately go to the hospital for treatment. After the cause of the disease is confirmed, the treatment should be standardized. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
The significance of the five Olympic rings
The five rings of the 2024 Olympics represented the five continents, namely Africa, America, Asia, Europe, and Oceania. The five rings symbolized the unity and friendship of the people of the five continents. The five colors of the five rings (blue, yellow, black, green, and red) plus the white background color could reflect the colors of the national flags of all countries in the world. At least one color of the national flag appeared in the Olympic rings. The five-ringed symbol also symbolized that athletes around the world were inspired by the Olympic spirit to compete on equal footing and get along well. It embodied the core values of the Olympic spirit, including peace, friendship, progress, and so on. While watching the Olympics, you can also read the wonderful novels related to the Olympics!
Fallen Star and Ye Xiao's novel
I recommend Minecraft has a few bullet comments, a light novel written by that female cat. The protagonist, Lin You, wanted to live an ordinary life after transmigrating, but the sudden appearance of the bullet screen broke the peace. The female lead has the ancient bridge text is, Xu Fang Li Zhu and so on, each has its own characteristics. This book was similar to the previous novels where the main character was a girl who could read the bullet screen. It was a Japanese manga and funny. The names of the male lead and his sister were super funny in the first chapter. However, the update was a little slow. Those who liked Japanese comics could watch it. Violent Evolution, a science fiction novel written by Sanguine Sky. When Ye Jun woke up, the world changed. The mysterious system forced him to wander between life and death. He wanted to lead everyone to break out of the cage. However, the plot and writing style in the book were old-fashioned. The protagonist was not outstanding, and the female characters were not well received. " The Path of the Interstellar Queen " was a science fiction novel written with carved railings and jade. Ye Wen was in a world thousands of years later. As a laboratory prisoner, she had to escape. 'My Daughter Is Too Awesome', a light novel written by Pigeon Steamed Bun. Luo Er had transmigrated to another world to adopt his daughter. His daughter later became a big shot. Her writing style was soft and relaxed, similar to a certain manga style. Although it was suspected of plagiarism, it was interesting at first, but now it was updating slowly. " Wifey, please give me your advice in this life ", an urban novel written by a pure little hand. The female protagonist returned to high school to pursue the male protagonist who had yet to be reborn. It was a 1v1, sweet, and the writing and plot were not bad. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
What are Wan Qian's TV dramas?
Wan Qian had acted in ancient TV dramas such as " Glory of the Tang Dynasty "," Demon Subduing Record of Qingtian Yamen 2 "," Cloud Herding Story on the Sea in Jiuzhou "," Hidden Dragon in the Abyss of the Three Kingdoms Secrets "," The Fate of Guanyin "," The Strange Plan of the Flower Carriage of Qingtian Yamen 2 ", and the movie " Liu Ru ". <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Shenzhou spacecraft and space shuttle
The Shenzhou spacecraft was a manned spacecraft developed by China to transport personnel and materials between heaven and earth. It was composed of an orbital module, a return module, a propulsion module, and an additional segment. The orbital module was where the astronauts lived and worked. The return module was the command and control center. The astronauts traveled back and forth in it. The propulsion module provided energy and power. The additional section was once used to install special equipment and was now used to install the rendezvous and docking mechanism. The first mission of the Shenzhou spacecraft, Shenzhou I, was successfully launched on November 20, 1999. The first manned mission, Shenzhou V, was successfully launched on October 15, 2003. The space shuttle was a vehicle that could be reused to transport people and cargo between the Earth's surface and low-Earth orbit. The system was composed of an orbiter, a propeller, and an external tank. It was propelled into orbit by a rocket. When it returned to the ground, it slid down like a glider and landed. When it was in orbit, it could complete tasks such as releasing satellites, recovering and repairing satellites, and microgravity experiments. The United States and the Soviet Union had built and experimented with complete space shuttles. The United States was the only country that had successfully carried out a manned mission with a space shuttle. In the early days of China's manned space project, the Shenzhou spacecraft and the Great Wall I space shuttle were proposed at the same time. In the end, the Shenzhou spacecraft was given a chance to develop due to its " small investment, small risk, and large grasp." China's choice to develop the Shenzhou spacecraft was correct. From the subsequent experience of the US space shuttle, even if the space shuttle did not explode, its " re-use " advantage was not obvious and the price was high. The novel " Hundred Years of Spaceship " is equally exciting. Everyone is welcome to click and read it!
Decimary-to-Binary-Conversion Computer
If one wanted to convert from decimal to binary-system, one could use the method of " divide by 2, take the remainder, and arrange in reverse order ". That was to divide the decimal number by 2 and record the remainder of each division. When the quotient was 1, the division operation was stopped. Then, all the remainder obtained were arranged in reverse order, which was the binary-representation of the decimal number. For example, if the decimal number 10 was converted to a binary-based number: 10 div2 = 5 remainder 0, 5 div2 = 2 remainder 1, 2 div2 = 1 remainder 0. At this time, the quotient was 1 and the calculation was stopped. The remainder was arranged in reverse order to obtain 1010, which meant that the binary-based number corresponding to the decimal number 10 was 1010. If it was a conversion from a binary-to-decimal system, the weight addition method could be used. The weight of each digit in the binaries was a power of 2. From right to left, it was 2^0, 2^1, 2^2, and so on. When converting, you only need to multiply the number on each digit by the corresponding weight, and then add all the products to get the decimal number. For example, the first bit of the number 1101 from right to left has a weight of 2^0 = 1, and the number is 1, so the multiplication results are 1×1 = 1; the second bit has a weight of 2^1 = 2, and the number is 0, so the multiplication results are 0×2 = 0; the third bit has a weight of 2^2 = 4, and the number is 1, so the multiplication results are 1×4 = 4; The weight of the fourth digit was 2^3 = 8, and the number was 1. Multiplying it would result in 1×8 = 8. Finally, the product was added up to 1+0+4+8 = 13, which meant that the decimal number corresponding to 1101 was 13. If you need to manually calculate the decimal-to-binary-conversion, you can do it according to the above method. If you want a more convenient calculation, you can use the online decimal-to-binary-conversion calculator. Enter "decimal-to-binary-conversion calculator" in the search engine and you can find the relevant online tools to convert.
Reborn into a dead star's novel, free to read
He recommended a few entertainment novels. " Rebirth of the Avenue of Stars " was written by Glutinous Rice and White Sugar. The female lead had been reborn from a Diva to a third-rate artiste. She had reached the peak of film and television again and could continue her previous relationship. However, looking at the design now, it was a little awkward. " Reborn Celebrity Superstar " was written by a girl. A child star was reborn as a healthy girl and she tried her best in acting. " Rebirth of the Heavenly King of the People " was Wen Xingyuan's work. The male lead was reborn and walked towards the throne of the Heavenly King of Entertainment. Although it was lacking, it could be considered a fine entertainment article. " Rebirth in the Starlight ", written by San Xian Cha Siu Bao, was the story of the female lead's road to stardom after her rebirth. I Want to Be a Celebrity in My Rebirth, created by Xi Ren. The extra Qin Ye relied on the system to realize his dream of becoming a celebrity in Parallel World. It could be saved but it did not update quickly. These novels had their own characteristics. If there was a shortage of books, he could look for them. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
A novel that combines love, marriage, and family life
" The Spring of the Boudoir " was an ancient romance novel written by Feng Jiulan. It was about Tang Mei wanting to become single after she transmigrated. It was a serious and inspirational novel. The new book," Family Joy," had been opened for collection and recommendation. The evaluation was that it could be read for an entire afternoon. Ugly Wife, Home Treasure, a modern romance novel written by beer fish. The male protagonist was devoted to the female protagonist, and the story of childhood sweethearts. Although the title of the book was not attractive, it could not stop reading. The user reviews were very high. Little Dainty Wife had developed a sweet and favorite novel, and the content was exquisite and attractive. " Reborn in a Perfect Family " was a modern romance novel written by Whale Blue. Her best friend's family valued boys over girls. Ye Zhizhi wanted to teach her parents a lesson after her rebirth. She was a newcomer and had a new novel. She was evaluated as having a good writing style. The female lead had a straightforward personality. " Dream of Rebirth " was a modern romance novel written by Dream of Three Laughters. The female protagonist was reborn to change her fate. She was surrounded by beautiful men and thought about love. It was a heartwarming short story. Home and Harmony was an ancient romance novel written with carved railings and jade. The female protagonist faced trouble with her family and wanted her family to be peaceful. The author stopped writing, but there were a few good books. <a href="/?from=ask_words" style="color:red" target="_blank">Read more exciting novels for free</a>
Surname Oracle Bone Inscription
In oracle bone inscriptions, surnames had certain characteristics. Surnames originated from the matriarchal society and represented people who were related by blood to the same mother. Many ancient surnames in our country were written next to the female character in the oracle bone inscriptions, such as the surname Ji and the surname Yao. At first, the surnames were mostly depicted by totems. With the widespread use of oracle bones in the Shang and Zhou Dynasties, words gradually replaced totems. During the Spring and Autumn Period and the Warring States Period, surnames and surnames merged into the surnames that are known today. The strokes of the inscriptions on bones and tortoise shells were simple, with a large number of pictographs. The shapes were mostly derived from the images of the original objects. The text was composed in horizontal and vertical styles. For example, the surname Du, the characters in the oracle bone script evolved from the pear tree. The upper part was like a branch, and the lower part was like soil. " Oh, My Yao " was equally exciting. Everyone, please click to read it!