CATDOLL : CATDOLL: Do you know the common diseases in yellow catfish farming and its prevention and control techniques?

Do you know the common diseases in yellow catfish farming and its prevention and control techniques?

1. Do a good job in fish disinfection

Disinfection of yellow catfish fingerlings that have been transported and screened for specifications is the most effective way to avoid infection with pathogenic bacteria. Therefore, we recommend that the breeding ponds be thoroughly cleaned and disinfected before stocking yellow catfish fingerlings; the transported yellow catfish fingerlings should also be thoroughly disinfected before stocking them in the breeding waters; in addition, disinfecting the breeding pond water after pulling the net in the breeding pond is also an effective measure to prevent the occurrence of ulcers on the surface of yellow catfish. Betadine has the characteristics of strong bactericidal power, strong stability, and low irritation; its effectiveness is not affected by water hardness, pH value, temperature, and organic matter, and has played a positive role in the prevention and control of aquaculture diseases in many places.

2. Feed high-quality feed

A nutritionist once said that "bait is the source of all diseases". If the quality of feed consumed by farmed fish is too poor and cannot meet the nutritional needs of yellow catfish at different growth stages, the immune system of farmed yellow catfish will be suppressed and its disease resistance will also decrease. Therefore, choosing a comprehensive and reliable feed is also an important condition to ensure that yellow catfish is less susceptible to disease. In addition, adding legal feed additives to the feed can also enhance the disease resistance and stress resistance of yellow catfish. The new generation of small peptide nutrient solution "Stalin" can induce feeding and promote growth, protect the liver and gallbladder, and enhance intestinal immunity. At present, "Stalin" has been successfully used in the breeding of California bass, white shrimp, and soft-shelled turtle in many places in Jiangsu and Zhejiang.

3. Keep the water quality "rich, lively, tender and refreshing"

Yellow catfish is a scaleless fish with strict requirements on the water environment. Therefore, during the breeding process, the water quality must be regularly regulated to maintain appropriate transparency and sufficient dissolved oxygen in the water, so as to ensure that the water is in a fat, active, tender and refreshing state. In addition to frequently turning on the aerator to increase the amount of dissolved oxygen in the water, stabilizing the physical and chemical factors in the breeding water by spraying some compliant and legal microbial preparations and water quality improvers can also better avoid the stimulation of the fish body itself by drastic changes in the water environment. "Youjiling" can chelate toxins/residual chlorine/pesticide residues, enhance stress resistance, and stabilize the algae phase. It has long become an important tool for many farmers to regulate water quality and cultivate seedlings.

Yellow catfish outbreak of fish deaths is coming! Farmers should do this...

Yellow catfish has strong disease resistance and generally does not suffer from serious diseases during farming. However, due to the influence of season, temperature, water quality, feed, the fact that it has no scales on its body surface, bacteria and parasites in the fish pond, it may also cause local infection or parasitic diseases. Therefore, it is necessary to prevent and treat them in time.

Gill rot

1. Symptoms

The body color of the sick fish is black, they swim alone, swim slowly, eat less or stop eating. There is no abnormality in the body shape, but the gill filaments are rotten and secrete a lot of mucus. When the disease is serious, there is dirt on the gill filaments.

2. Epidemic situation and hazards

Both fingerlings and adult fish can be infected, with the peak period being April to June each year. Severe cases can lead to fish death.

3. Prevention and treatment methods

Do a good job of pond cleaning, and use 2% to 3% salt water to disinfect the pond for 5 to 10 minutes before stocking the fish. Spray chlorine dioxide (0.12 to 0.15 g/m2) over the entire pond close to the water surface, and it will be cured after 2 to 3 times.

Saprolegniasis

1. Symptoms

When Saprolegnia first parasitizes, no abnormalities are visible to the naked eye. As the disease progresses to the point where it can be seen with the naked eye, the Saprolegnia has grown outward from the fish body into cotton-like hyphae.

2. Prevalence

The disease is prevalent throughout the year, with early spring and late winter being the most common periods of disease. It is seriously harmful to hatching fish eggs and fish fry and adult fish with wounds on their bodies. As the area of ​​the lesion expands, the fish becomes overloaded, swims abnormally, becomes restless, and loses appetite until their muscles rot and they eventually die of emaciated death.

3. Prevention and treatment methods

Use 0.19-0.23 kg/m2 of quicklime to clean the pond. Try to avoid fish injuries during fishing, transportation and stocking. Before stocking the fish, use a 2%-3% saline solution for 5-10 minutes for disinfection, and control the stocking density appropriately. Fertilized eggs should be strictly disinfected before hatching, and the water temperature should be controlled at 26-28℃. Fertilized eggs should be disinfected again during the hatching process.

Hemorrhagic edema

1. Symptoms

The body of the sick fish turns yellow, and the mucus increases; the pharyngeal skin is damaged and congested with round holes; the abdomen is swollen, the anus is red and swollen, and turned outward; some fish have congestion in the head, congestion in the base of the pectoral and pelvic fins, ulceration of the fin rays, and even longitudinal cracks in the abdomen from the pectoral fin to the pelvic fin, and bile leaks out. A large amount of blood or yellow jelly accumulates in the abdominal cavity, there is no food in the stomach and intestines, the stomach is pale, the intestines are filled with yellow pus, the liver is earthy yellow, the spleen is necrotic, and there are moldy black spots on the kidneys.

2. Epidemic situation and hazards

It is easy to break out in the hot season, and it is fierce and spreads quickly. When the water temperature is 25-30℃, once the disease occurs, a large number of sick fish will die. This disease is very harmful to the breeding of yellow catfish. Once the disease occurs, some sick fish can often be seen rotating in the water and dying soon.

3. Prevention and treatment methods

Remove the seriously ill yellow catfish, inject fresh water, and replace 1/2 of the original pond water; then disinfect the water in the breeding pond with strong chlorine, the dosage is 0.3g/m3, once a day, for 3 consecutive days. Add 1% salt to the feed, and feed it at regular times and fixed points.

First of all, we need to understand its characteristics. When they are alive, they require a relatively high oxygen content in the water. When they are raised, they are prone to split head disease. If you find such a situation, you can lower the temperature. When the temperature is lowered, they can generally recover.

When raising this type of fish, the most important thing is to prevent some diseases. For example, some high temperature diseases are easily caused in the summer, so you should pay attention to disinfection at all times.

1. The main diseases of yellow catfish include viral diseases, bacterial diseases, parasitic diseases, and liver and gallbladder diseases. Viral diseases are mainly preventable and there is no effective treatment.

2 Preventive measures: During the breeding process of yellow catfish, try to maintain a reasonable stocking density, drain and change the water regularly, use Fudi'an to improve the bottom or disinfect with povidone-iodine solution every half a month, and take multivitamins and Sanhuangsan orally to maintain the health of yellow catfish and improve the resistance of the fish. Check the fish regularly for parasites and kill them in time if found.

How to prevent and treat the red spot disease of yellow catfish?

Since your description is not very clear, I cannot make a definite judgment. I can only tell you all the knowledge about diseases of yellow catfish, so that you will know how to prevent and treat them when you encounter various situations in the future. Although yellow catfish has strong disease resistance, as the stocking density increases, coupled with improper management and operation, diseases often occur, resulting in a lower survival rate. Therefore, strengthening disease prevention and control is a key measure to ensure aquaculture production and economic benefits. The common diseases of yellow catfish and prevention and control methods are introduced as follows:

1. Field bacterial enteritis

1.1 The disease is caused by infection with Aeromonas punctata.

1.2 Symptoms The abdomen of the sick fish is swollen, the anus is red and swollen, and yellow mucus flows out of the anus when the abdomen is gently pressed. The intestine is inflamed, light red, and filled with blood and pus. The sick fish leave the group and go to the shore, move slowly, and have a decreased appetite.

1.3 Prevention and control ① Do not feed rotten and moldy baits. Disinfect live baits with 2% to 3% salt before feeding. Add 0.1% fresh garlic juice to the bait regularly. ② Spray 0.3g/m3 of strong chloramine or 0.5g/m3 of chloramine throughout the pond. ③ Feed medicated baits, add 0.05g of oxytetracycline per kg of bait, and use it for 10 consecutive days. ④ Feed sulfaguanidine medicated baits, use 1og of medicine for every 100kg of fish on the first day, and reduce the dosage by half on the 2nd to 6th days.

2 Hemorrhagic edema

2.1 The cause of the disease is bacterial or viral infection.

2.2 Symptoms The fish has yellowish color, increased mucus, broken and congested pharyngeal skin with round holes, distended abdomen, swollen and red anus, congested head, congested base of pectoral and pelvic fins, ulcerated fins, bile extravasation. A large amount of blood or yellow jelly is accumulated in the abdominal cavity, the stomach and intestines are empty, the liver is earthy yellow, the spleen is necrotic, and there are moldy black spots on the kidneys.

2.3 Prevention and control ① Disinfect water bodies with 0.5g/m3 of dibromocyanine for 3 consecutive days; ② Feed medicated bait, add 0.79 tetracycline or 0.5g ciprofloxacin per kg of bait, and feed continuously for one week; ③ Increase the amount of water change and disinfect regularly with 15-20g/m3 of quicklime.

3 Saprolegniasis

3.1 The cause of the disease is water-borne mold.

3.2 Symptoms The fish swim slowly, have cotton-like attachments on their bodies, become thin and weak, and die. This disease is most likely to occur when the water temperature is low, and is often caused by improper operation during net pulling and transportation.

3.3 Prevention and control ① During the process of fishing, transportation and stocking, operate with caution to avoid injuring the fish as much as possible; ② Soak in 20g/m3 of Saprolegnia littoralis for 105 minutes; ③ Sprinkle 0.3g/m3 of Saprolegnia littoralis throughout the pond; ④ First soak the diseased fish in 5% salt water for 5 minutes, and then soak in a solution made of 100k added 800,000 units of penicillin for 10 minutes.

4 Trichodinasis and tricholoma

4.1 The disease is caused by large numbers of wheelworms or oblique tube worms parasitizing the gills and skin of fish, which mainly harm the yellow catfish seedlings.

4.2 Symptoms The sick fish are restless, float to the upper layer and swim wildly, or spin on the water surface with their abdomen facing upwards. Microscopic examination shows a large number of wheelworms or oblique tube worms parasitizing on the gill filaments and skin mucus.

4.3 Prevention and control ①Spray 0.7g/m3 of copper sulfate and ferrous sulfate mixture (5:2) throughout the pond; ②Spray 0.3-0.4g/m3 of compound fish and insect cleaner throughout the pond; ③Spray 0.15g/m3 of fish and insect killer throughout the pond; ④Clean and disinfect the pond thoroughly with quicklime.

5 Ichthyophthirius

5.1 The disease is caused by Ichthyophthirius multiflorus infection in the skin and gills of fish.

5.2 Symptoms: Small white spots can be seen on the skin of the diseased fish. Use tweezers to remove the small white spots and place them on a glass slide. Add a drop of clean water and the small white spots can be seen moving slowly in the water. Observe under a microscope to confirm the diagnosis.

5.3 Prevention and control ① Soak the fish body in 50g/m3 of formalin for 10 minutes; ② Sprinkle 0.3-0.4g/m3 of compound fish worm throughout the pond; ③ Bathe in 20g/m3 of water mold net for 15 minutes.

6 Dactylariasis and trichodinasis

6.1 The disease is caused by Dactylopius or Trichodina parasitizing the gill filaments and skin.

6.2 Symptoms The gill filaments of the diseased fish are swollen, the gills are partially pale, the fish have difficulty breathing, the body is emaciated, the fish swims slowly, and the fish loses its appetite and dies.

6.3 Prevention and control: ①Spray 90% crystal trichlorfon 0.5g/m3 throughout the pond; ②Spray compound fish and insect net 0.4g/m3 throughout the pond; ③Spray insecticide 0.15g/m3 throughout the pond.

7 Anchorhead disease

7.1 The cause of the disease is parasitic infection by anchorhead fish.

7.2 Symptoms The fish are restless and swim slowly. The parasitic parts are congested, inflamed, swollen and have red spots. The anchorhead parasites are visible to the naked eye.

7.3 Prevention and control: ①Spray 0.5g/m3 of 90% crystal dichlorvos throughout the pond; ②Spray 0.15g/m3 of fish and insect killer throughout the pond.

In short, the principle of "prevention before disease, early treatment when diseased, prevention is better than treatment" should be adopted to treat yellow catfish diseases, so as to prevent or reduce the losses caused by dead fish. Pay attention to maintaining fresh water quality, and be meticulous in operations such as pulling nets and transporting. Yellow catfish is a fish with a large scale, and its tolerance to drugs is not as good as that of domestic fish, so the dosage of drugs must be accurately controlled.

Keep your skin clean

This is not internal medicine.