CATDOLL : CATDOLL: What is the treatment procedure for crucian carp hemorrhagic disease in winter?

1. What is the treatment procedure for crucian carp hemorrhagic disease in winter?

Crucian carp hemorrhagic disease is a common disease of fish in high temperature seasons. In recent years, the incidence of crucian carp hemorrhagic disease has begun to increase, especially viral hemorrhagic disease is more serious, fierce, with high incidence and mortality. Sometimes a pond of crucian carp can die because of it. The prevention and control of crucian carp hemorrhagic disease has become a key task in the aquaculture industry. Let’s take a look at the prevention and control methods of crucian carp hemorrhagic disease!

Symptoms

The peak period of hemorrhagic disease in crucian carp is from May to September every year, and it gradually threatens other farmed fish in the pond, resulting in a large number of dead fish. In the early stage of crucian carp disease, the sides of the fish body, eye sockets, gill covers, fins and other parts are slightly congested. In severe cases, the body surface and fins are severely congested, blood is around the eye sockets, some fish have protruding eyeballs, there is light yellow ascites or red turbid ascites in the abdomen, the intestinal wall is congested, the intestine is inflated with air without food, and there is a lot of mucus. The gill filaments are congested or there is severe anemia.

Causes

There is a lot of silt at the bottom of the pond, and toxic substances are deposited in large quantities. At the same time, the silt also provides a place for the pathogens of explosive hemorrhagic disease (Aeromonas hydrophila, Aeromonas sobria, and Yersinia ruckeri) to breed in large quantities. There is a lack of oxygen in the water, and the water environment is deteriorating. Abnormal weather and excessive temperature changes lead to stress reactions in fish, which reduce resistance.

Treatment

1. For external use: "Mujunxiao" 150 ml/mu*m + "Benzalkonium bromide" 30 ml/mu*m.

2. For internal use: Mix 200g of "Dakebacterium" per 1000kg of fish body weight and 300g of "Induced Stress Relief Type 3" per 40kg of feed and feed once a day for 5 consecutive days.

Precautions

1. If there is an insect disease, kill the insects first, use 40 ml of "Beichongjing" per mu*meter. When raising fish together with grass carp and other fish, you can use crushed wheat mixed with "Dake bacteria" to sprinkle throughout the pond and combine it with granular feed mixed with "Dake bacteria" + "Yingjining Type 3" for fixed-point feeding.

2. If there is a problem with the water quality, it must be improved before medication can be used. Water quality problems can cause repeated bleeding diseases. If the nitrite level is too high, you can use "Water Purification Detoxifier" 500 ml/mu*m or "Jie Shui Ling" 200 g/mum.

3. During the treatment of fish disease or within one week after recovery, there are three "bans": one is to ban pulling nets, two is to ban adding large amounts of water, and three is to ban the application of nitrogen fertilizers such as ammonium urea.

2. Can crucian carp bleeding disease be cured in winter?

It can be cured. If the water body is small, you can buy water mold net and sprinkle it. If the water body is large, it is recommended to buy gallnut and boil it into 50 times the amount of water and sprinkle it.

When the disease occurs, do not change the pond water in large quantities. You can slowly add water to prevent stress caused by changing water. Regularly desilt the pond, expose the pond to the sun, and disinfect it with quicklime to kill pathogens.

3. Why did fish appear first?

There is no such thing as the first one. The origin of fish is very early. Fish have lived in the ocean before humans appeared in the world. Although some ancient species have become extinct in the process of evolution over hundreds of millions of years, other emerging species have emerged.

According to literature records, fish were first discovered in the Ordovician strata 400 million years ago, but the fish fossils obtained at that time were incomplete. It was not until the late Silurian period that a complete concept of the relationship between fossils and early vertebrates was obtained.

During the Devonian period, various ancient and modern fish appeared.

The Devonian Period can be said to be both the birth age of fish and their heyday. Since there were not many other vertebrates at that time, some people call the Devonian Period the "Age of Fishes."

By the Cenozoic Era, various groups of fish were extremely numerous and became the largest group of vertebrates, marking the heyday of fish development history.

From the analysis of fossils obtained from the Devonian period, ancient fish can be divided into four major categories: jawless fish, armored fish, cartilaginous fish, and bony fish.

Jawless animals were most numerous in the Silurian and Devonian periods, and are recognized as the earliest vertebrates. The bodies of fossil jawless animals are almost covered by thick bony plates and hard substances, so they are called armored fish.

Placoderms were the earliest jawed fishes. They flourished during the Devonian Period, but most of them became extinct by the end of the period.

Some people believe that cartilaginous fish and bony fish evolved from placoderms in two directions, but there is still no evidence to confirm this.

Cartilaginous fish are considered the most "primitive" fish, but it is generally believed that cartilaginous fish and bony fish are two branches that developed in parallel.

The earliest bony fish were the ancient cod, from which evolved the vast majority of existing bony fish.

The typical primitive representatives of the endorhinal fishes among bony fishes are the Dipterygians and the Osteoporhinids, the latter of which is the earliest crossopterygian fishes in the Devonian period.

Crossopterygians are considered to be the direct ancestors of the earliest amphibians. On December 22, 1938, someone caught a large fish on the southeast coast of Africa. It was 1.5 meters long and weighed 58 kilograms. After research and confirmation by experts, it was believed that this fish should belong to a new family of Crossopterygians. Thus, people finally found the extinct fish, which was later named Latimeria (i.e., Latimeria).

The appearance of the living fossil of the lanceolate fish has given us a lot of inspiration. As we all know, humans evolved through a long process; fish came to land and evolved into amphibians, then completely left the water and evolved into terrestrial reptiles and mammals, and finally evolved into humans.

Specifically, the lobe-finned fishes split into two branches, one of which (the osteichthyes) left the water.

One branch gradually evolved into humans; the other branch was more conservative (coelacanths), and never left the water. The current lacertids are the descendants of the latter. The lacertids, a living fossil, provide us with many situations that cannot be obtained from fossil materials.

4. When will the special fish in Genshin Impact appear?

Regarding this question, the appearance time of special fish in Genshin Impact is determined by different types of fish. Generally speaking, the appearance time of special fish is usually related to weather, time and location. The following are some common special fish and their appearance time:

1. White Whale: In the waters near Liyue Harbor, it can only appear in clear weather and during the day.

2. Barracuda: In the waters near Liyue Harbor and Fisherman's Wharf, it can only appear in clear weather and during the day.

3. Pearl Abalone: ​​It is found near the Dandelion Sea area and is only likely to appear in clear weather and during the day.

4. Flower Eel: In the rivers and waters near Qinglong Island, it is only likely to appear in clear weather and during the day.

5. Bluntnose Salmon: In the waters near Liyue Harbor and Fisherman's Wharf, it can only appear on rainy days and at night.

Please note that the appearance time of special fish may change with the update of the game version.

5. What fish can be caught by fishing with small fish in winter?

Small fish can be used to catch carnivorous fish, common ones include black carp,

Snakehead fish, catfish, yellow catfish, etc. will also appear in autumn and winter.

Caught omnivorous fish, the actual fish caught depends on the actual

Determined by the fish and water conditions.

When choosing fishing bait, you should consider the actual water conditions and

The fish situation is also closely related to the season.

Combined considerations.

When using small fish for fishing, be careful to keep

The activity of small fish can be hung on the tail of the fish when hooking

The fish should be positioned naturally in the water.

The swaying of small fish can better attract the attention of fish.

6. In which period of the Paleozoic Era did primitive fish appear?

Primitive fish appeared in the middle of the Paleozoic

Researchers from the United States and Britain have discovered that in the Paleozoic era more than 400 million years ago, the ancestors of fish lived in shallow waters near the coast, and only after a long period of evolution did they spread into the deep sea and fresh water.

As the first vertebrate on Earth, fish first appeared in the Ordovician period about 480 million years ago, but fish fossils did not appear in large numbers until 420 million years ago. It was previously unclear where fish were during this gap. This study, published in the latest issue of the American journal Science, fills in this missing link in the study of evolutionary history.

7. How many years ago did the first fish appear in the sea?

They first appeared in the Early Cambrian period more than 500 million years ago and were the earliest differentiated fish. The main representatives of jawless fish in the ocean at that time were armored fish. Later, due to a gene mutation, the first fish with jaws appeared, and jawed fish were able to actively and effectively hunt.

Under the natural selection of "survival of the fittest", more and more jawed fish began to appear, and jawless fish fell into a disadvantage in hunting competitions.

In order to survive, some fish evolved super strong jaws, with a bite force that could cut a shark in two, while others began to explore new horizons. The emergence of jawed fish made the competition for survival in the ocean more intense, and the food chain of "big fish eat small fish, small fish eat shrimp" was formed from then on.

8. When will fish appear in Animal Crossing?

There is no specific time. Each type of fish has a different distribution location, appears at different times and places, and has different prices. The most expensive fish are the lanceolatus and the Pacific barrelfish, and the cheapest is a tadpole.

9. Stripes appear on the screen in winter?

Reason 1 for stripes on the computer screen: graphics card failure

If stripes appear on your computer screen, it is very likely that you have been using the computer for a long time, causing the graphics card to overheat or malfunction. If you find stripes on your computer screen, you need to shut down your computer immediately, let the graphics card buffer, clean the dust around the graphics card and the card slot, and then try again to see if the stripes appear. If not, you need to replace the graphics card.

Reason 2 for stripes on the computer screen: incorrect display refresh rate setting

1. If the computer display refresh rate is too low, it will cause jitter and stripes on the screen. At this time, we need to right-click on a blank area of ​​the computer, then click Properties to enter the property settings window. In the page that pops up later, select the Advanced button to enter the advanced properties interface of the monitor.

2. When you click the monitor button in the display, if you see that the display refresh rate is 60, this is the main reason for the screen to shake continuously and stripes appear.

3. Finally, adjust the display refresh rate to above 75, click OK, and return to the desktop.

Reason 3 for stripes on the computer screen: external magnetic field interference

1. If the above two methods still cannot solve the problem of stripes on your computer screen, then your computer monitor is likely to be interfered by an external magnetic field, causing jitter stripes.

2. To avoid external interference, you can place the computer on a table with a relatively empty space on all four axes, and then turn it on for testing.

3. If the stripes on the screen disappear, it means that there is strong magnetic field interference at the original location of your computer. If it does not disappear, you can move away the speakers, cups and other items near the computer one by one, and then turn off the monitor and reopen it to test.

Reason 4 for stripes on the computer screen: the monitor has been used for too long

If you use your computer monitor for too long, it will cause aging inside the monitor, causing the screen to become dim, the fonts to be blurred, and stripes to appear. This requires us to replace the aging capacitors in the monitor. It is recommended that users send it for repair or replace it with a new monitor.

2 Causes and solutions for stripes on the computer screen

External interference: This is caused by strong electromagnetic interference near the display, such as electric sparks and high-frequency electromagnetics. If the interference intensity is very strong, white horizontal stripes will appear on the entire screen of the display; if the interference intensity is not strong, it will appear as a serious change in one corner of the display.

Solution: When these two situations occur, we must first focus on checking the area around the display to eliminate any equipment that has strong magnetic interference. Generally, the problem can be solved.

Affected by internal interference: There is a big difference between internal interference and external interference. If the monitor is interfered internally, black horizontal stripes will appear on the display screen, and it will be quite serious.

Solution: If this happens, we can open the case and check whether there is any poor contact inside the monitor, or whether there is any problem with the output end of the power supply or the output transformer.

Another reason is that the monitor has been used for too long, and the internal capacitors will age and fail, resulting in slow startup, a dim screen, and blurred fonts. At this time, simply replacing the aged capacitors can generally eliminate the problem, but since it is also a highly technical job, it is recommended to send it for repair.

Due to improper monitor resolution settings, serious stripe problems may also occur on the computer screen. This type of failure generally occurs on older machines. If your computer works under WIN95, you can press the F8 key to enter the system's safe mode, reset the monitor's display mode, and the fault can generally be eliminated after restarting.

Solution to stripes on computer screen

3 What to do if stripes appear on the laptop screen

Solution 1: Graphics card failure

The phenomenon of irregular stripes on a laptop is caused by long-term use of the computer, which leads to a graphics card failure. If this happens, you should turn off the computer in time and let it rest for a while, so that the graphics card of your laptop can be buffered slowly. Otherwise, long-term use will damage the graphics card.

In addition, the laptop screen should be wiped regularly to ensure the cleanliness of the laptop screen. Once dust enters the inside of the screen, it will damage the chip of the laptop screen. Such chips are relatively fragile and cannot be restored once damaged, so it is very important to keep the laptop screen clean.

Solution 2: Display settings problem

If the refresh rate is set too low, it will cause screen jitter. To check, right-click a blank area on the system desktop, click the "Properties" command from the pop-up right-click menu, and enter the display property setting window. Click the "Settings" tab in the window, and then click the "Advanced" button in the corresponding tab page that pops up to open the display's advanced property setting interface.

10. Centipedes appear in your home in winter?

There are many centipedes in the house in winter, which should be:

1. The house is not tightly closed: Centipedes have a strong ability to drill through cracks, and they often use their keen sense of touch and flat heads to explore caves and cracks. Therefore, if the door or bedroom at home is not tightly closed, centipedes will drill into the house through the cracks in the door.

2. Too many things piled up at the doorstep or bedroom: If there are weeds at the doorstep, or if there are haystacks or firewood piles nearby, centipedes like to stay in dark and damp places. The chicken coops, pig pens, and cracks in the tiles of the house at the doorstep are all places where centipedes like to stay. If there are too many things piled up in the bedroom, it also provides favorable conditions for centipedes to live.

3. Reasons of moisture: Due to moisture, centipedes mostly live in damp cracks or damp things. Just clean them frequently and keep them dry.