CATDOLL : CATDOLL: The yellow croaker I raise has white nodules on its internal organs. What is causing this?

1. The yellow croaker I raise has white nodules on its internal organs. What is the cause?

The visceral white spot disease of large yellow croaker is a bacterial disease caused by Pseudomonas putida. It is prevalent from late autumn to late spring of the second year. The prevalent water temperature is 12-20℃. It is less harmful in autumn and very harmful in spring. When the disease occurs, the fish's body surface is normal. Dissection shows that there are a large number of white nodules of varying sizes in the spleen and kidneys. In severe cases, white spots will also appear in the liver, and the muscles lose elasticity. When encountering this disease, bile acid + florfenicol + doxycycline + Lechang + Sanhuang powder can be mixed with feed for oral administration, external disinfectant, and then water adjustment can be performed, which can have a certain therapeutic effect. However, since the symptoms of the disease are not obvious, even if there is a small amount of loss, most farmers will not pay attention to it. In addition, Pseudomonas putida is resistant to many common antibiotics. At the same time, the effect of antibiotic treatment is not very good when large-scale outbreaks occur in large yellow croaker. Therefore, the control of this disease should still be "prevention first, prevention is more important than treatment".

2. Why do the fish in the aquarium have small white spots on their bodies? Previously, a large yellow croaker had black spots and congestion on its body and died. What happened?

When changing the water, the temperature difference is too big, and the water is changed too quickly. Next time, let the water dry for a longer time, change the water in a smaller proportion, change about a quarter at a time, and change it once a week at most. Don't change the water too frequently. The circulation system should be good. The filter cotton should be clean. If there are small white spots on the fish, it is white spot disease, which needs to be treated. Yellow powder should be added to the water, or special medicine for treating white spots should be used. For details, please go to Baidu.

3. What to do if fish have white spot disease

White spot disease is a common disease of fish. Generally, it can be cured by heating and adding salt for three days. If it is serious, you can use white spot cleaner. But I personally recommend not to use medicine. It is easy to destroy the nitrification system.

4. How to solve the white spot disease of fish

White spot disease is a very common disease when raising goldfish, and it is also a very difficult disease to treat. Below I will summarize some treatment methods for reference by fish lovers.

The first treatment process: red water + heating rod

3 fish with white spot disease were treated with mercurochrome. The heating rod was heated to 31℃ and the dosage of mercurochrome was 6ml/100 liters of water. After 24 hours, the white spots were significantly reduced, and the condition of the fish began to improve. They no longer lay on the tank and started to swim. On the second day, the water was changed in small amounts by 1/2 several times from morning to afternoon and then an equal amount of mercurochrome was added. That evening, 85% of the white spots disappeared, and the fish were active and started to eat green moss. A careful observation was made on the morning of the third day. No white spots could be found on the 3 fish. The fish were in good condition and started to compete for food. The white spot disease was completely cured. The medicine was applied twice from the beginning, and the effect was fast and significant.

Second treatment: methylene blue, ginger + chili pepper

This time, two goldfish with white spot disease were treated separately, one in each tank. No heating rod was used, but medication was used: the first one was soaked in high-purity methylene blue for 24 hours, the dosage of methylene blue was 2 mg/L of water, and half of the water was changed to isothermal water every day, and then the medication was re-applied with the same amount of methylene blue as the first time. After four consecutive applications, the medication was stopped, and the fish was not fed or changed in water. The original medication solution was continued to be soaked, and the white spot disease of the goldfish was basically cured on the 7th day; the other fish was treated by spraying ginger + chili water, method: (1000 liters) use 4 grams of ginger and 1.5 grams of chili pepper, chop the chili pepper and cut the ginger into shreds, boil in water for 30 minutes, cool, filter the residue, and spray the entire tank with the medicine. After changing one quarter of the water every day, spray the ginger and chili water once. After 8 days, the white spot disease was cured.

Third treatment: saline, heating rod

There was a fish with white spot disease, with a small amount of white spots on the tail, and no Ichthyophthirius was found in other places. It was soaked in 0.5% salt water for 24 hours without feeding or changing the water. On the second day after adding salt, the white spots on the tail began to increase and white spots also appeared on the fins. On the third day, white spots began to appear on the body of the fish. On the fourth day, the body of the goldfish was covered with white spots, and the goldfish became listless and did not swim much. On the fifth day, the symptoms of the goldfish worsened, and the sick fish lay on the tank from side to side. On the sixth day, it was discovered that salt water could not control the disease of the fish, so a heating rod was put into the fish tank and the temperature was raised to 31°C. No medicine was added. The first day of using the heating rod did not change much, and on the second day the white spots began to decrease, the condition began to improve a little, and it swam occasionally. On the third day, the white spots on the goldfish's body decreased by about 1/2, the goldfish began to swim, and its condition began to improve. On the fourth day, the white spots decreased by about 3/4, the goldfish could swim and rub against the tank. On the fifth day, the white spots on the goldfish basically disappeared, and the condition of the sick fish basically recovered.

Fourth treatment: Mercurous nitrate

Use a diseased fish with white spots all over its body, and use 50 kilograms of water with mercuric nitrate crystals the size of a grain of rice. Soak the fish in the water for 20 minutes until the water turns a light milky white. Then isolate the fish in salt water for a day. On the second day, the white spots will basically fall off. Use the same amount of medicine to soak the fish for another 20 minutes, isolate the fish in salt water again, and it will be cured on the third day.

Summarize:

1. Mercurous nitrate is very effective in treating white spot disease, and the fastest effect is achieved with mercury + warming. However, mercurous nitrate is highly toxic, and the dosage must be very accurate, otherwise it may poison the goldfish, and it cannot be used for fry. Relatively speaking, mercurochrome is less toxic, and the dosage is easy to control. A syringe can be used, and there will be no overdose. A dosage of 6 ml of mercurochrome per 100 liters of water is very safe, and the dosage for fry should be halved.

2. Methylene blue or ginger pepper water can also be used to treat goldfish white spot disease, but the effect is slower and takes longer, requiring about 7 days; using a heating rod can shorten the treatment period. Methylene blue also has a destructive effect on the nitrification system; ginger pepper water is less destructive to the nitrification system.

3. Warming treatment: Heating with a heating rod in the treatment of white spot disease can significantly enhance the therapeutic effect and shorten the treatment time. It is an essential and important step in the rapid cure of white spot disease. Even heating alone without adding medicine can treat white spot disease. Because Ichthyophthirius multifiliis is afraid of heat and will stop developing at 28 degrees, white spot disease will basically not occur in water temperatures above 28 degrees.

The above information comes from the Internet. Please adopt it if you are satisfied.

5. Fish White Spot Disease

White spot disease, also known as Ichthyophthirius punctatus, is a common fish disease caused by external parasites of fish.

White spot disease is easy to treat. As long as it is discovered in time, it can be cured without medication.

Treatment:

Treatment method 1: Raise the water temperature to above 30 degrees, add a little salt, and add oxygen for 24 hours. This method is relatively safe and effective in treating white spots.

Note: If there is grass in the fish tank, heating may kill the grass, so it is not recommended to use a grass tank. If there is a scavenger in the fish tank, adding salt may kill the scavenger. If there is a scavenger, do not add salt. Raise the temperature and add oxygen.

Treatment method 2: Add yellow powder or methylene blue. These two drugs are relatively mild and suitable for use in grass tanks. They can also treat other diseases, such as tail rot. After the treatment, there is no need to change the water in the entire tank, and the water pollution is relatively small.

Treatment method 3: Add white spot cleaner, which is effective quickly, but it will cause serious water pollution, and this medicine contains harmful ingredients to the human body, so it is not recommended for non-serious cases. After using the medicine, change the water in the whole tank.

Treatment method 4: Use potassium permanganate. Potassium permanganate cannot be placed directly in the fish tank. It must be dissolved in another container. The ratio cannot exceed 1/5000. Put the sick fish in. After 5-10 minutes of medicated bathing, remove the sick fish and keep them in a separate tank if conditions permit. This method works quickly, but it is more harmful to the fish. Improper use may cause the death of the fish. It is not recommended.

White spot disease is not difficult to treat. When changing seasons, make sure the water temperature does not differ by more than 2 degrees from the water temperature in the fish tank, which can reduce the incidence of white spot disease.

After white spot disease occurs, it is best to disinfect the entire tank, because 30 degrees can kill the adult Ichthyophthirius multifiliis but cannot kill the eggs of Ichthyophthirius multifiliis. Concentrated potassium permanganate can be used for disinfection. Potassium permanganate is harmful to fish. Be sure to rinse the fish tank clean after disinfection.