Can the disease of fish be predicted in advance? Common fish diseases and prevention and treatment methods are here!

For professional fish farmers, one of the most worrying problems is the occurrence of fish disease. Because once the outbreak of fish disease, fish are a large area of death, such a loss can be said to be devastating. So what are the signs of fish getting sick? Can you predict it in advance? Let's talk about how to predict fish diseases in advance, what are the common fish diseases and prevention and treatment methods? The majority of fish farming professionals and bulk farmers can take a closer look at it!

What are the signs and manifestations of fish illness?

1. The fish disappear and blacken, swim alone or float on the edge of the pool.

2. The fish surfaced and swam wildly or around. Fish tail fins attacked by Chinese fish fleas often come out of the water, and sick fish spin or swim on the surface of the water; pesticides or industrial waste water poisoning, fish will be excited, jump and collision, and then paralyzed to death.

3. The food intake of fish suddenly decreases.

4. All of a sudden, dead fish appear.

What are the common fish diseases? How to prevent and cure it?

1. Gill rot disease: the disease mainly occurs in grass carp and herring, mainly in autumn. It shows that the Gill filaments of diseased fish are rotten and whitish, and in severe cases, the cartilage at the end of the Gill filaments is exposed, often with mud. The inner surface of the operculum is often corroded into transparent windows.

Prevention and treatment: ① is injected with bacterial vaccine or local vaccine.

② is sprinkled with 1 gram of bleach per cubic meter of water or 4 grams of Chinese nutgall per cubic meter of water.

③ was sprinkled in the whole pond with 10kg quicklime and 2.5kg salt per mu, once every 7 days, 3 times in a row.

④ is sprayed throughout the pond with 0.3g of poultry per cubic meter of water. The next day, feed with erythromycin bait, 0.4 grams for every 10 kilograms of fish, and the dosage of 2 Mel will be halved for 6 days.

2. Enteritis: the disease mainly occurs in grass carp and herring, often from April to October. Symptoms are red and swollen anus, severe fin base congestion, fin fissure, abdominal erythema; open fish abdomen, abdominal effusion, intestinal congestion and inflammation, no food in the intestine, milky yellow mucus or blood pus.

Prevention and treatment: ① vaccination or.

② was fed with 5 grams of sulfamidine for every 50 kg of fish, and the dosage was halved from day 2 to day 6, once a day.

③ garlic, every 50kg of fish with 0.5kg (add a small amount of salt) mixed concentrate for 3 days.

④ 0.25kg rhubarb for every 50kg fish, minced, add 2.5kg ammonia and soak for 30 minutes, then add water and mix well with refined feed.

3. Red skin disease: this disease mainly occurs in grass carp and herring and can occur all the year round. The symptoms showed hyperemia, inflammation and scale exfoliation on both sides of the fish body and abdomen. The fin base is congested, the fin strip is split, and the end is rotten.

Prevention and treatment: ① was vaccinated.

② oral sulfathiazole 5 grams (as drug feed) for every 50 kg of eating fish, and the dose was halved in 2-6 days.

③ use 1 gram of bleach per cubic meter of water in the whole pond.

④ was sprinkled throughout the pond with 10kg of quicklime and 2.5kg of salt per mu, once every 7 days, for 3 times.

4. Water mildew: the disease is common between spring and summer and between autumn and winter, and it is most likely to occur when the water temperature is 15 ~ 20 ℃. All kinds of farmed fish can occur. When the mycelium on the body surface propagates in large quantities, the focus of the body surface is like white cotton floc, the parasitic part has the phenomenon of hyperemia and decay, and the body surface is multi-mucus.

Prevention and treatment: ① operation should be as careful as possible, do not injure the fish, pay attention to reasonable close breeding, do not make the overwintering density too high.

② fish ponds can be cleared with quicklime, or each side of water can be used to pour 3 grams of gallnut into the whole pond.

③ soaked the diseased fish with Kangmyuning for 1 hour, and the effect was good. When the water surface per mu and the water depth is 1 meter, you can use 2.5rel 5kg calamus juice, add 0.5ml 1kg salt, and then add 2Mel 5kg human urine, mix and sprinkle it all over the pond.

5. Gill mildew: it mainly occurs in bighead carp, silver carp and dace. It is common from May to October. The Gill of the diseased fish is pale, and sometimes there is a little bleeding, forming the symptoms of red and white embedding; explosive acute death often occurs.

Prevention and treatment: ① control the amount of fertilizer application, timely injection of new water.

② is sprinkled throughout the pond with 0.7g copper sulfate per cubic meter of water.

③ moves the diseased fish into ponds with thinner water quality, and the disease can be stopped.

During the onset of ④, 2.5kg of Artemisia argyi leaves and 1.5kg of calamus were used per mu, and 10kg of fried water was used throughout the pond for 2 days.

In addition, when the air temperature changes greatly, it will lead to a large difference in water temperature between the surface and bottom of the pond, which may induce the occurrence of fish disease. therefore, farmers should pay attention to weather changes, strengthen management, and take corresponding measures to predict the occurrence of fish disease.