What kind of fish is silver carp? With disease prevention and control technology!

Silver carp is one of the four famous domestic fish and one of the main freshwater fish in China. It grows fast, has few diseases and has high yield. So, silver carp is what fish, common disease prevention and control technology what? Let's introduce it to you.

1. What kind of fish is silver carp?

1. Silver carp is a kind of fish belonging to Cyprinidae and Hypophthalmichthys, also known as silver carp, silver carp, jumping silver carp, silver carp, etc. Its shape is similar to bighead carp. Its body is spindle shaped, flat on the side, its head is larger, its back is bluish gray, its sides and abdomen are white, its fins are gray, its peritoneum is black, and its body is covered with small round scales.

2. Silver carp is a pelagic fish. It swims and forages in the pelagic layer of water in spring, summer and autumn. In winter, it dives into deep water and overwinters. Its distribution range is relatively wide. It is distributed in all major water systems in China. It is the most widely distributed fish in freshwater fish in China.

3. Silver carp is a filter-feeding fish. It mainly eats plankton in water. It mainly eats plankton in the fry stage. When it grows up, it eats phytoplankton. It also likes to eat grass carp feces and chicken manure and cow dung. It also eats soybean milk, bean dregs powder, bran, rice bran and rotten food.

4, silver carp is a lively fish, like to jump, have the habit of upstream, but the action is not very agile, relatively clumsy; their courage is very small, afraid of disturbance, when disturbed or touched by the net, have jumped out of the water over the net and fled.

5. Silver carp is a fish with poor tolerance to hypoxia. It floats immediately in the water due to hypoxia, and some die soon.

II. Prevention and control techniques of silver carp diseases

1. What are silver carp diseases?

Although silver carp has few diseases, it still gets sick. Common diseases include gill rot, vertical scale disease, acne disease, gill mold, print disease, water mold, swim bladder inflammation disease, iodine bubble disease, double tapeworm disease, ring worm disease, etc.

2. How to prevent silver carp disease?

There are many kinds of diseases in silver carp, and the prevention and cure techniques of several diseases are introduced here.

(1) Rot disease

Symptoms: It is a fish disease with rapid infection and long duration. Once it occurs, it is difficult to control its spread. The disease begins to occur and epidemic at water temperature above 15℃. The onset time is from April to October in the south, from May to September in the north, and from July to August is the peak period of incidence. After the disease occurs, the gill filaments rot and bring sludge. In severe cases, the gill cartilage is exposed, and the inner epidermis of the gill cover is corroded, forming a transparent "small window".

Prevention and control: prevention is the priority, prevention is more important than cure, 200g of dibromohydantoin or chlorine dioxide is poured into the whole pool, and at the same time, it is mixed with Yufuning, Garlicin and Yuxueting according to the proportion of 0.2% and fed for 3~6 days; or it is sprinkled with strong insecticide or insect killer with the concentration of 0.01-0.02ppm, and the fish is taken orally and fed twice.

(2) Vertical scale disease

Symptoms: mainly popular in late winter and early spring, generally when the water quality deteriorates or the fish body is injured, transcutaneous infection; early disease fish body black, rough body surface, fish body front scales erect, serious when the whole body scales erect, scale sac contains blood-containing exudate, gently press the scales with hands, exudate will spray out from under the scales, scales will also fall off; sick fish swimming slow, breathing difficulties, abdominal upward, 2 to 3 days later that death.

Prevention and control: avoid fish body injury, keep water fresh; parent fish spawning pool in winter to dry pool, with quicklime or bleaching powder disinfection; early injection of new water can alleviate the disease, or in the feed to add 5% crude aureomycin or oxytetracycline feeding.

(3) Branchial mildew

Symptoms: often occurs in the water quality is very bad, organic matter content is very high smelly pond, often occurs in May-October, June-July is epidemic, the incidence rate can reach 70%-80%, the mortality rate can reach 90%; after the disease gills tissue color pale, lose normal bright red, serious gills full of cotton floc, like a small cotton ball, affecting respiratory function, will eventually die due to respiratory obstruction.

Prevention and control: often keep the water quality clean, prevent water quality deterioration, regularly sprinkle with quicklime pool; winter to remove excess sludge in the pool, and use quicklime pond disinfection; found that the disease should be quickly added to the water, or fish moved to the water thinner pond, and then use the pool to sprinkle poultry red mold 0.3-0.5ppm or rivanol l-1.5ppm.

(4) Printing disease

Symptoms: This disease can be seen all year round, but it is easy to occur in summer and autumn, 28-32℃ is its epidemic peak, it is generally believed that the occurrence of this disease is related to operation injury; after the disease occurs, the body surface of the sick fish behind the dorsal fin has approximately circular erythema, the scales of the focus fall off, and finally ulcer is formed and even the bones or internal organs are exposed. The sick fish swims slowly, the appetite is reduced, and eventually dies due to exhaustion.

Prevention and control: pay attention to the cleanliness of the pool water, avoid the invasion of parasites, carefully operate not to make the fish body injured, can reduce the occurrence of this disease; after the disease, use 0.5ppm of bacteria toxin or 0.3ppm of dibromohydantoin to splash the whole pool.

Conclusion: Silver carp belongs to Cyprinidae, Hypophthalmichthys, pelagic fish, filter-feeding fish, active fish, fish with poor tolerance to hypoxia, although few diseases, but still can get sick. This paper mainly introduces the prevention and control techniques of four diseases of silver carp: gill rot disease, vertical scale disease, gill mold and print disease.