CATDOLL : CATDOLL: How many types of anoxic fish are there? How to domesticate anoxic Cooper fish?

1. How many types of oxygen-deficient fish are there?

There are many fish that are not afraid of lack of oxygen, such as guppies, mollies, moonfish, goldfish, and bettas. Most of these fish can live in an environment with low dissolved oxygen due to their small size, and some have special auxiliary respiratory organs, so they can breathe on the water surface, and low dissolved oxygen will not affect their lives. However, in order to make the fish grow better, it is best to use an oxygen pump to oxygenate it.

2. How to domesticate the oxygen-deficient Cooper fish?

1. For the convenience of feeding, it is necessary to choose the edge of the pond; 2. For the convenience of fish feeding, this point should be the relative midpoint of the pond; 3. There should be no weeds or trees nearby and it should be sunny, and 1 to 2 feeding tables should be set up near the feeding point. At the beginning, feed along the four sides of the pond, feed more at the feeding table and its vicinity, and then gradually narrow the feeding range every day and move towards the feeding table. Generally, after 5 to 7 days of domestication, the fish can be led to the feeding point to eat. At the same time, during the domestication period, before or during each feeding, use methods such as knocking objects or whistling to make specific sounds, so that the fish will have a conditioned reflex to the specific sounds. When the fish hear the specific sounds in the future, they will gather at the feeding point to eat.

3. Under what circumstances will the fetus suffer from hypoxia?

There are many situations that may cause fetal intrauterine hypoxia. For example, pregnant women have severe anemia or gestational hypertension, and their blood pressure is not well controlled. And if pregnant women sleep on their right side, it may aggravate the right rotation of the uterus and affect the blood supply to the placenta, which may cause fetal hypoxia. If pregnant women have some other underlying diseases, poor control may also cause hypoxia.

4. What are the acute toxicities of pesticides to fish?

Pesticides can enter the body through oral ingestion, skin contact or respiratory tract, and have adverse effects on physiological functions or normal activities of organs, causing poisoning and death of humans or animals. Poisoning caused by three different ingestion methods is called acute oral toxicity, acute skin toxicity and acute inhalation toxicity. In any poisoning, we consider how much ingestion can cause biological death, measured by the lethal median LD50, which refers to the dose required for a chemical substance to cause death in half of the subjects. LD50 is the most important parameter for evaluating the acute toxicity of a chemical substance, and it is also the basic standard for grading the acute toxicity of different chemical substances. The greater the acute toxicity of a chemical substance, the smaller its LD50 value. The toxicity of a pesticide is measured by its smallest LD50 value. From the value you gave, it can be seen that the inhalation toxicity is very strong, reaching 4.76, which can be said to be a highly toxic pesticide. However, the poisoning is not serious if taken orally and in contact with the skin.

5. Under what circumstances will the baby suffer from lack of oxygen?

There are many reasons for fetal hypoxia. If pregnant women are usually hypoxic, it can also cause fetal hypoxia. If pregnant women are overworked, or are in a tense and excited emotional state, it will increase the blood circulation of the heart, resulting in insufficient blood supply to the heart, leading to ischemic hypoxia, and thus fetal ischemia and hypoxia. If the umbilical cord is too short in the uterine cavity, or the umbilical cord is wrapped around the neck, it can also easily cause fetal ischemia and hypoxia. Umbilical cord knots, too thin or excessive placental function can cause fetal hypoxia. During hospitalization, especially in the middle and late stages of pregnancy, excessive calcium supplementation can lead to placental calcification and poor blood circulation, which can easily lead to fetal intrauterine hypoxia and intrauterine hypoxia.

6. What is the dissolved oxygen content in water and how to determine whether fish are suffering from hypoxia?

Low dissolved oxygen in the water will reduce the fish's appetite and even cause them to refuse to eat. Even if they eat feed, their digestion and absorption rate will be low, their growth rate will slow down, and their feed utilization rate will decrease. If this continues for a long time, it will cause stunted growth and various diseases.

The feed utilization rate of fish at 3.0 ppm dissolved oxygen is half that of 4.0 ppm. When the dissolved oxygen content in the water reaches above 4.5 ppm, the fish's appetite increases significantly, and when it reaches above 5 ppm, the feed utilization rate reaches the optimal value.

Some studies have shown that when the dissolved oxygen content in water drops from 7.6ppm to 3.1ppm, feed utilization rate decreases by 5.6 times and growth rate decreases by 9 to 10 times. Tropical fish require the dissolved oxygen content in water to be above 7ppm. If the dissolved oxygen in water drops to 5ppm, tropical fish will "float". If no measures are taken at this time, tropical fish will be in danger of suffocation and death.

7. How long can loach survive without oxygen?

If it gets hard, you will really die.

If it's not hard, it may recover.

8. Under what circumstances will fish die from lack of oxygen?

1. Any fish floating on the surface can be regarded as a precursor to hypoxia

Many fish lovers always feel that their filtration is good and there is no need for oxygen supply, or that there is sufficient oxygen supply and there is no need to turn on the filtration system. These practices are wrong. In such extreme weather, it is best to ensure that the filtration system and oxygen supply system are operating normally 24 hours a day, unless our water body is very large or the stocking density is extremely low.

There are also some new fish lovers who will doubt this and that when they see very few ornamental fish floating to the surface in this kind of weather. In this case, we should not doubt it anymore and must deal with it decisively. As long as we see some fish floating to the surface, we should give priority to whether there is sufficient oxygen in the fish tank.

Just like a few days ago, I found that my little mini parrot fish had very few symptoms of hypoxia, but I didn’t care too much because I relied on the large water body and low density.

Yesterday, because there were not enough fish worms to eat, I scooped up a large amount of fish worms and fed them into the fish tank. This morning, I found that most of the small fish fry showed symptoms of short-term floating to the surface. Combined with the hot weather, too many fish worms, and no water changes for more than 20 days, I decisively put most of the fish fry into the small fish pond. I have been wanting to do this for the past two days, but I never got around to it and eventually they suffered from lack of oxygen.

Everyone must remember that long-term lack of oxygen for ornamental fish is very likely to cause organ failure, and then they will slowly die one by one without any symptoms. This is very rude.

2. Frequent water changes are the best way, but don’t do a big water change

In this season, frequent water changes are a must, but many ornamental fish are not suitable for large-scale water changes, so we can change the water more frequently and in small doses.

It is better to ensure that there is a certain supply of new water in the fish tank almost every day. Frequent water changes are a must in this period. If the water temperature is high, the water can be changed at a temperature about 2 degrees lower than the original tank water temperature. If the water temperature is higher than 35 degrees, even if there is a 5-degree temperature difference when changing the water, most ornamental fish will be fine except for too small fry.

And it won't be a big deal if you change a maximum of one-third of the water. However, it depends on the species of ornamental fish. Some high-end ornamental fish that are more sensitive to water quality are not suitable for this operation. It is better to change one-quarter to one-fifth of the water.

3. Reduce the amount of feed and the organic matter content in the fish tank

When the weather is hot and humid and the water temperature is too high, the dissolved oxygen content in the water will drop rapidly, so our other job is to reduce the discharge of organic matter in the fish tank and strictly control the feeding amount of ornamental fish. If the ornamental fish show symptoms such as loss of appetite, retracted fins and lying on the tank, or encounter extremely high temperatures, we can stop feeding them appropriately.

If I hadn't fed them too much fish worms, the fry wouldn't have suffered from collective hypoxia. Now that the density has been reduced, I've taken out some more fish worms, and the few remaining fry are no longer suffering from hypoxia.

Regarding the issue of cleaning the filter cotton, the filter cotton can be washed, but be sure not to over-clean it. If it causes the water to become turbid, it will be difficult for us to deal with it in this extreme weather. If you are not careful, there will be a risk of suffocating the tank. Simply rinse or rub it a few times, and don't go into the obsessive-compulsive habit of washing it thoroughly.

4. To increase the vibration frequency of the fish tank water surface, you need an oxygen pump

This is beyond doubt. Some fish lovers said that my fish tank has a bottom filtration system. There is also a water level difference in the bottom filter, which will also increase the amount of oxygen, but there is also a pipeline transportation process. If it is a top filtration system, it should be better than the bottom filtration in this regard.

However, if the water temperature of the fish tank exceeds 33 degrees, we should add oxygen supply equipment in the fish tank. After all, this is quick and direct. In short, try every means to increase the vibration of the water surface of the fish tank, the water surface of the fish tank, not the water surface of the filtration system. This is the best way.

If you usually turn on the filter and air pump, you can increase the amount of oxygen, which is conducive to better oxygen supply in the fish tank.

5. Are cooling measures necessary?

I guess most families may not need this. One reason is that almost every household has air conditioners and fans. If my family members are fine, there will basically be no problem for ornamental fish at this temperature.

In fact, adding ice bottles into the fish tank is not a good idea. After all, this will cause the water temperature in the fish tank to fluctuate, which is not necessarily a good thing. Besides, the indoor temperature of an average household cannot exceed 30 degrees. Just like the fish farmer here, the indoor temperature is kept at around 29 degrees.

Most ornamental fish, and even almost all cold-water and tropical ornamental fish, are basically safe to survive when the water temperature is 32 degrees. However, the key issue still depends on our stocking density, feeding amount, water change frequency, and effective oxygen supply and filtration.

6. Don’t add the so-called reagents to the fish tank at this time

These include table salt, water purifiers and various fish medicines. We should never add them to the fish tank if we can avoid doing so. In such a high temperature environment, these things can easily damage the water quality and cause hypoxia in the water.

If some fish are sick, we still have to isolate and treat them separately, but the only thing to note is that they should never be deprived of oxygen. Don't wait until the fish disease has not been treated and the ornamental fish die of lack of oxygen. This is not worth it. The best way is not to keep the sick fish in the isolation container overnight, just in case.

7. Feed live food or ice food in hot weather to prevent spoilage

The last one is about feeding ornamental fish. Pay special attention to live food and frozen fish food. We must ensure that they are fresh.

9. Under what circumstances will there be no lack of oxygen in the water?

As long as the water is constantly circulating, there is no lack of oxygen in the water.

The decrease in oxygen content in the water can first be judged based on weather conditions. If the weather suddenly turns sunny after a continuous low temperature, the oxygen content in the water will inevitably decrease. In addition, anglers can also prepare a barometer. When the air pressure is lower than 1000hpa, they should be alert to the possibility of fish hypoxia.

10. Under what circumstances does acute gastroenteritis require hospitalization?

Acute gastroenteritis can easily cause abdominal pain, diarrhea, loss of appetite, fever, weakness, nausea and vomiting, etc., which are related to improper diet. If you cannot eat due to acute gastroenteritis, your fever does not subside, and you cannot control the frequency of bowel movements, it is best to go to the hospital for hospitalization to avoid dehydration. Pay attention to your diet and avoid spicy, irritating, and cold foods, and keep your abdomen warm.