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Koi fish is the first choice for many fish farmers, because of its strong physique, changeable patterns and bold swimming style, which has both ornamental and feeding values. In the process of raising koi fish, we should pay more attention to how to prevent and treat diseases in koi fish. Here are six common koi fish's diseases.

1 Symptoms of vertical scale disease in koi fish:

The body surface of the diseased fish is rough, and some scales (mostly in the tail) spread outward like pine cones, forming vertical scales, and transparent liquid gathers under the scales. Sick fish sometimes have symptoms such as exophthalmos, abdominal distension and subcutaneous congestion near the base of fins. The sick fish swam slowly, had difficulty breathing, and the abdomen was upward, and died after 2 to 3 days.

Prevention and control: 1. Use 1% saline and 1% baking soda to make a mixed solution, soak the fish for 10 minutes, and take effect after repeated medication. 2. Furacillin powder 0. 1g was added with 2 gentamicins and dissolved in an aquarium of 80cm×50cm×40cm. Long-term medicinal bath has certain curative effect, especially for sick fish in the early stage of illness. 3. Baking soda and salt bubbles are ok, but the effect is slow. 4. Pulverize trimethoprim disulfonate tablets and put them into water. 5. Penicillin/chloramphenicol/gentamicin immersion bath also has a certain effect.

2 Hemorrhage symptoms of koi fish's disease: usually occur in June-September; The diseased fish body surface is black and dull, the mouth, muscles and fin bases are congested, and there will be bleeding in the head and abdominal wall; Gill silk is bright red or punctate bleeding occurs; The serious fish body is pale because of massive bleeding, which makes the cheeks bleed. There will also be appetite matching, slow action, frequent departure from the group, and getting thinner every day. Prevention: 1. Strengthening feeding management, maintaining good water quality, controlling feeding in summer and autumn and creating a good water environment will play a certain role in preventing the disease. 2. Sprinkle bleaching powder in the feeding water in epidemic season to make the drug concentration in the water reach 1mg/L, so as to prevent diseases. 3.4 ~ 10 mg/L erythromycin soaked fish 15 minutes is effective. 4. Injecting tissue plasma vaccine and cell culture inactivated vaccine can effectively prevent the occurrence of this disease.

3 White spot symptoms of koi fish's disease: At first, the body of ciliates was spherical or oval, with short and evenly distributed hands on the surface and horseshoe-shaped nucleus in the center of the body. Blisters on sick fish are the phenomenon of dense parasitism of these small melon worms. In the late stage of the disease, the fish body is covered with a layer of white film, with increased mucus, dark body color, thin body, slow swimming, solitary swimming without group, and less activity.

Prevention and control: 1. Change one-third of the water, raise the water temperature to above 30 degrees, and add a little special salt for ornamental fish (available at any time) to increase oxygen supply. This method is relatively safe and effective in treating leukoplakia. Try not to use drugs.

2. Increase dissolved oxygen in water, maintain good water quality, and make bacteria at a competitive disadvantage in water. It is recommended to stop feeding temporarily. Continued feeding at high temperature will only accelerate the deterioration of water quality!

3. In addition, cross-infection is mild, and other diseases can be treated, such as rotten tail. After treatment, the whole cylinder does not need to change water, which has little pollution to water quality.

4. Use potassium permanganate. Potassium permanganate can't be put directly in the fish tank. Should be melted in another container, the proportion should not exceed one in five thousand. Put in the sick fish, take out the sick fish after 5- 10 minutes, and raise them in tanks if possible. This medicine takes effect quickly, but it is harmful to fish, and improper use may also lead to the death of fish, so it is not recommended.

4. Symptoms of koi fish's disease: It is caused by parasitic fish. It is very harmful to young fish and fingerlings. The naked eye can see the surface of the diseased fish. Big matches are like nails, and insects as small as rice grains are attached to fish like palladium nails, or crawl on fish with their bellies down. Stabbing, mouth stabbing, jaw stabbing or tearing fish skin. The fish is extremely upset and swims wildly in the water? Jump? .

Prevention and control: 1. In the early stage of illness, the breeder can soak the sick fish in salt solution. Koi fish is soaked in 2%-3% salt solution every time 15-20 minutes. Under the stimulation of salt water, lice on fish often fall off on their own. 2. You can also use the crystal trichlorfon bath method to soak koi fish in the proportion of 0.7 g crystal trichlorfon per cubic meter of water for 15-20 minutes each time, and the treatment effect is very good.

Water mold of koi fish's disease.

Symptoms: Water mold is also called white disease. Bacteria are slender in shape, up to 3 cm, and have branches. Some of them are rooted in the skin of fish, and the rest are exposed on the surface of fish. White and soft; In the early stage, the mucus on the surface of fish increased, and in the later stage, hyphae infiltrated into the skin on the surface of fish, resulting in an increase in mortality.

Prevention and control:

1. Spraying a mixture of 0.04% salt and 0.04% baking soda on the diseased fish pond;

2. Injured parent fish can be smeared with 4% sulfur wine;

3. Fish eggs can be soaked in 4% formalin for 2-3 minutes.

4. When the aquarium water temperature rises to 30 degrees (not applicable to cold-water fish), add 1% salt (salt-tolerant fish does not add salt), and change one third of the water the next day.

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Symptoms of gill rot in koi fish's disease: The main pathogen of parasitic gill rot is ring worm or rotifer, which makes the fish nominally infected and the gills swollen and difficult to open. In severe cases, gill ulcers and gill cartilage are exposed, and fish have difficulty breathing and eventually die.

Control: 1. You can choose 50 grams of salt and 50 grams of baking soda, mix them in 10 kg of water, and soak the sick fish 15-20 minutes. You can also choose 0.7 g malachite green and soak the sick fish in 100 g water 15-30 minutes. 2. Disinfect the fish pond regularly to keep the water clean and reduce the chances of germs breeding. The use of fresh feed and biological live bait has obvious effect on preventing the disease.