CATDOLL : CATDOLL: How long is the life span of a fish?

1. How long is the lifespan of a fish?

How long can fish live? This is a very interesting question. However, it is not easy to really find out the maximum or average lifespan of fish.

At present, there are many methods to determine the age of fish. The simplest method is to peel off a few complete scales from the fish. After drying, you can find layers of rings on the scales that mark the age of the fish, just like the annual rings in a tree trunk.

How are the ring patterns of fish formed? Originally, fish have no scales when they are just born, but in the first year of their life, their bodies are covered with scales. The scales are composed of many thin sheets of different sizes, like an irregular short cone with the top cut off. The top layer is the smallest, but the oldest; the bottom layer is the largest, but the youngest. As the fish grows, new thin sheets grow on the inner surface of the scales; as the fish grows older, the number of thin sheets continues to increase. The upper and lower layers of scales grow in completely different ways. The lower layer grows piece by piece, and the new piece always overlaps the original piece and grows larger than it. The upper layer grows in rings, and the thickness is not much different. Because the growth rate of fish is different throughout the year, in spring and summer, when food is abundant, fish grow faster; in autumn and winter, when the climate is cold and food is scarce, fish grow slower. Therefore, the distance between the concentric circles formed on the scales in spring and summer is wider, while the distance between the concentric circles formed in autumn and winter is narrower. Such wide-spaced concentric rings are called summer rings, and narrow-spaced concentric rings are called winter rings. Summer and winter rings are arranged alternately. A complete "annual ring" includes a summer ring and a winter ring. Therefore, as long as we count the number of annual rings on the scales, we can easily figure out the age of the fish. In addition to the age marks on the scales, the fish's vertebrae, gill covers, otoliths, pectoral fins, and dorsal fins can also be used to determine the age of the fish.

Carp has a long lifespan. In my country, carp over 40 years old have been found. It is said that carp can live to over 300 years old! Pike also has a long lifespan. Legend has it that in 1794, someone caught a pike in the Queen's Lake Pond near Moscow. It had a gold ring on its gill cover, which read: "Released by Tsar Boris Fedorovich." Tsar Boris's dynasty was from 1598 to 1605. Based on this, it can be inferred that this pike has lived in the lake for over 200 years. Catfish also have a long lifespan, which can live for over 100 years.

Cod in the ocean can live for 13 years, flounder can live for 60-70 years, and some types of goldfish can live for 30 years. However, some fish have a very short lifespan, such as pond carp, which can only live for about one year; some fish have a huge difference in the number of years of growth between male and female, such as minnow, under natural conditions, female fish can generally live for 12 years, while male fish can rarely live to 8 years old; some fish often end their lives through reproductive behavior, such as the salmon we are familiar with, most of which die immediately after spawning, and few of them have a "long life".

The life span of a goldfish is related to its breeding conditions and the fish's physical condition. It is generally believed that a goldfish can only live for 6-7 years, but some people have observed that goldfish can live for more than 10 years or even longer under good breeding conditions. When a goldfish becomes old, its ornamental value becomes lower and lower, and it is no longer worth breeding.

Koi are long-lived, with an average age of 70 years. The longest-lived one is over 200 years old. Because of their long life span, they are considered a symbol of good luck, so they are also called blessing fish.

2. What is the ultimate lifespan of fish?

Generally speaking, the life span of fish is related to the age of sexual maturity. The larger the fish is, the later it matures, and the longer its life span is. From this perspective, the world's largest fish, the whale, should have the longest life span. Unfortunately, so far, people know nothing about its life span. It is reported that the European sturgeon living in the Caspian Sea and the Black Sea can weigh up to 1,500 kilograms and live for more than 100 years; and the white sturgeon in the Yangtze River in my country has a life span of nearly 100 years. Many small fish, such as the false goby, herring, and silver fish in freshwater, have a life span of only about one year. Although the life span of fish varies greatly among species, the life span of most fish is concentrated between 2 and 20 years, of which 60% are concentrated between 5 and 20 years. No more than 10% of fish can live for more than 30 years, and only 5% live for less than 2 years. Among the freshwater fish in my country, the life span of silver carp, minnow, redfin whitefish, copper fish, yellow catfish, silver carp, and sand snakehead is between 2 and 4 years; the life span of black carp, grass carp, silver carp, bighead carp, crucian carp, bream, redfin whitefish, and mandarin fish is mostly between 7 and 8 years, and some can live for more than 10 years. The life span of marine fish is shorter.

3. How long is the life span of fish?

The life span varies from fish to fish. Some, such as whitebait and pond smelt, can live only one year, while others, such as sturgeon, can live for decades. It is said that pike can live up to 200 years, making it the oldest fish.

4. What is the reason for frost in the refrigerator's refrigerator compartment?

The reason why the refrigerator freezes is that the air humidity in the refrigerator is too high, the temperature is too low, and there is too much water.

To eliminate the problem, 1. First check if there is any gap in the door seal. If so, ask the maintenance worker to replace it.

2 Is the drainage hole at the bottom of the refrigerator's refrigerator compartment blocked? Sometimes the drainage hole is blocked and there is too much water and ice.

3 Check whether your refrigerator is shutting down normally. Sometimes, the thermostat fails, causing the compressor to stop, resulting in ice on the top and bottom.

The above points are all good,

There are some tips for defrosting refrigerators:

Some refrigerators need to be defrosted. Manual defrosting is time-consuming and laborious, and the defrosting effect is not good. Here is a defrosting trick recommended to you.

According to the size of the refrigerator compartment, cut a piece of slightly thicker plastic film and stick it on the frosted wall of the refrigerator compartment. No glue is needed. When defrosting, take out the food in the refrigerator compartment temporarily, peel off the plastic film and shake it, and the frost will fall off. Then stick a new film, put the food in, and continue to use it.

A method to save electricity in refrigerator:

For every 5 degrees Celsius increase in the temperature around the refrigerator, the power consumption inside will increase by 25%. Therefore, the refrigerator should be placed as far away from heat sources as possible, preferably in a ventilated and shaded place. The refrigerator door should be opened for a short time; in case of power outage, do not rush to open the refrigerator door. Do not put hot food into the refrigerator, and make sure the food is allowed to air out at room temperature before putting it in the refrigerator; it is best to pack the food in the freezer with clean plastic bags, which can freeze the food quickly, and it is not easy to dry out, and moisture will not turn into frost; the food should not be filled too full, and there should be a gap between the refrigerator wall to facilitate the flow of cold air; frozen food should be transferred to the refrigerator to thaw in a planned manner before eating.

If the freezer is usually kept at -18 degrees Celsius instead of -22 degrees Celsius, 30% of electricity consumption can be saved. Go to the store and buy two bags of new energy-saving products - super ice bags, and put them in the refrigerator. When the refrigerator starts cooling, the ice bags will absorb the excess heat in the freezer. Because the thermal resistance of the ice bag is higher than the thermal resistance of the refrigerator's insulation layer, it plays a role in storing cold and reduces the loss of refrigerator cooling. It is determined that using this method can save about 6 kWh of electricity per month.

Since frost is a poor conductor of cold, the freezer should be defrosted in time (when the frost accumulates to 5 mm thick). After cleaning, the refrigerator should be dried and then powered on for refrigeration to avoid immediate frost.

When there is a sudden power outage, how to keep the food in the refrigerator fresh:

Normally, you can use a small plastic bag to put clean water in the freezer and freeze it into ice cubes. When there is a sudden power outage at home, you should try to open the refrigerator door as little as possible. With ice cubes inside, the refrigerator compartment can still maintain a certain low temperature to keep food fresh. Frost-free refrigerators are more suitable for preserving food in this way.

Some wonderful uses of refrigerators in life:

(1) Seal your leather shoes with shoe polish and place them in the refrigerator to prevent them from hardening and drying out and from going bad.

(2) Placing softened soap in the refrigerator will help it harden.

(3) Cigarettes and tea leaves can be sealed and placed in the refrigerator to retain their fragrance for a long time; coffee will not clump if placed in the cold room.

(4) Storing films, cosmetics, and Chinese and Western medicines in a refrigerator can delay their expiration date.

(5) If the candle is stored in the refrigerator for more than 24 hours, the candle oil will not drip when burning.

(6) Dry cell batteries can be stored in a refrigerator to extend their shelf life and service life.

(7) Placing clothing with difficult-to-remove wax or sugar stains in the freezer will help the hardened and brittle stains to come off more easily.

(8) It can clean and smooth clothes and extend the life of clothes. For example, if chewing gum is stained on clothes, put the clothes in the refrigerator to freeze. Once the chewing gum is frozen, it will be easier to remove. Silk clothes that are difficult to iron can be sprayed with water, put in a plastic bag and put in the refrigerator for a few minutes, then taken out and ironed for better results. Women's stockings can be frozen in the freezer to extend their life.

346》How to remove odor from refrigerator

If a refrigerator is used for a long time, an unpleasant odor will appear. In addition to using deodorant to remove the odor or cleaning the refrigerator in time, you can use the following simple methods to remove the odor.

1. When steaming buns, leave a small piece of raw dough in a bowl and place it on the upper layer of the refrigerator's cold storage compartment. This will keep the refrigerator odor-free for 2 to 3 months.

2. Wrap 50 grams of tea leaves in gauze and put it in the refrigerator. Take it out after one month and expose it to the sun. Then put it in gauze and put it in the refrigerator. Use it repeatedly.

3. Use a clean cotton towel, fold it neatly and place it next to the upper rack of the refrigerator. The tiny holes on the towel can absorb the odor in the refrigerator. After a while, take out the towel, wash it with warm water, and dry it before using it again.

4. Wash and dry a few pieces of fresh orange peels and place them in the refrigerator. The fresh orange peels can also help to remove the strange smell. 347》A great way to fry fish fillets without breaking them

1. Choose fresh fish, preferably herring, yellow croaker, pomfret, etc. as the raw material for fried fish fillets, and mix the cut fish fillets with appropriate amount of

Mix salt, egg white, starch and iron and let it sit for a while.

2. The fish fillets need to be fried before frying. When the oil temperature is 30% to 40% hot, put the fish fillets in. When they turn white and float lightly, remove them from the oil and drain.

3. Leave a little oil in the pot, add onion, minced ginger, wine, MSG, salt, hot soup, thicken with water starch, pour the fish fillet in and stir-fry for a few times. The fish fillet fried in this way is white in color, tender in texture and intact. 348》 Tips for frying spiced peanuts

First, soak the raw peanuts in a boiling water solution of pepper and star anise for about two hours (note that the soaking time must not be too long, otherwise the peanuts will swell), then remove and dry them, then put them in the pot and fry them with sand. When they are about 70% cooked, filter out the sand with a sieve and you can eat them. The peanuts are crispy and delicious at this time. Remember to dry them before frying, otherwise the moisture will easily make the sand stick to the peanuts and taste bad.

★★★: Freezer ice:

Reasons: 1. The temperature of the refrigerator is too low; 2. The refrigerator door is not sealed well, and hot air enters the refrigerator; 3. The water collecting funnel is not aligned with the water collecting tray.

Solution: 1. Increase the temperature of the refrigerator compartment, 2. Repair the door seal. 3. Adjust the water funnel.

Attached are more detailed reasons and analysis:

(I) Cause Analysis 1. There is too much frost on the evaporator. When it melts, the water overflows from the water tray and flows into the refrigerator. 2. The water tray in the refrigerator is not aligned with the water funnel, causing the water to flow into the refrigerator. 3. The drain pipe is frozen, so the defrosting water cannot flow out, but accumulates in the refrigerator. 4. Cold water or other beverage containers are overturned and flow into the refrigerator, or the lids of beverage bottles are not tightened and are placed horizontally on the food shelf, causing the beverage to flow out. 5. The refrigerator door is not closed tightly or the sealing strip is damaged, allowing the outside hot air to continuously flow in and condense into water. 6. There are too many uncooked foods stored in the refrigerator, such as hot drinks, hot tofu, mung bean soup, etc., which instantly form a lot of fog and water droplets in the refrigerator. As the temperature drops, they condense into water. 7. The food stored in the refrigerator has a large water content. As the temperature drops, the water vapor in the food evaporates, condenses when it encounters cold, and then becomes water, which flows into the refrigerator. 8. The temperature in the refrigerator is too low, causing the glass bottles of soda, beer, fruit juice and other beverages to burst and flow into the box. 9. In the hot summer, the hot air enters the refrigerator from the water outlet pipe, causing the water vapor in the refrigerator to increase. 10. The water in the freezer is too full. When the water freezes into ice, the volume expands, causing the water to overflow the ice maker and flow into the refrigerator. 11. The antifreeze device of the refrigerator is damaged. In the rainy season, the hot air condenses on the outer surface of the refrigerator door and flows on the ground. Due to the influence of the above factors, when there is too much water in the refrigerator, it flows out from the bottom edge of the refrigerator. (II) Troubleshooting methods 1. When using the refrigerator, you should do defrosting frequently, which is also a measure to save electricity. 2. Adjust the water funnel to align with the position of the water tray. 3. The temperature in the refrigerator's cold storage room should not be adjusted below 0°C. It is usually appropriate to adjust it to 2-6°C to prevent water from freezing. 4. When refrigerating beverages, they should be handled with care. Plastic containers with bottle caps should be placed upright on the food shelf with the door. If placed on the food shelf, the bottle caps should be tightened to prevent the liquid from flowing out. 5. When using a refrigerator, opening and closing the door is an important task, which requires carefulness to prevent the cold from escaping. If the sealing strip is found to be damaged, it should be repaired in time. It is also required to pay attention to whether there is dirt on the door edge and the strip at any time. If found, wipe it off immediately. 6. Hot food is not allowed to be placed in the refrigerator. Wait until it cools naturally to room temperature before placing it in the cold storage room. 7. For foods with high water content, they should be packed in plastic bags and the bag mouth should be tied tightly to prevent the water vapor in the food from evaporating and increasing the amount of water accumulated in the refrigerator. 8. The temperature of the cold storage room in the refrigerator shall not be lower than 0°C, and should be controlled at 2-6°C. At this time, bottled beverages will not burst. 9. In summer, put some water in the water container outside the refrigerator, then connect a rubber hose to the water outlet pipe head inside the refrigerator, and immerse the other end of the rubber hose in water, so as to prevent the outside hot air from entering the refrigerator and condensing. 10. When freezing ice cubes or popsicles, the water volume in the ice maker should not be too full, generally 80% of the capacity is better. 11. Perform maintenance.

If it is a thick layer of frost, then your gear is too high. You can adjust it to a lower level. Generally, there will be some frost in the cold and dry Li Youchi storage room, but it can be too thick. Generally, a layer will slowly melt away. Sometimes there may be ice beads on the back wall. This is the most normal situation! ~ ~

The low temperature in the refrigerator is usually caused by the temperature control gas breaking down and not stopping the machine.

Water