Disease prevention and control techniques of silver carp

Silver carp, also known as silver carp, etc., is one of the excellent species suitable for breeding. It has the characteristics of rapid growth, less disease and high yield. It is mostly mixed with grass carp and carp, and is the main freshwater farmed fish in our country. Envy us to take a look at the prevention and control techniques of common diseases of silver carp!

Gill rot disease

[characteristics of the disease] the diseased fish were blackened, left alone and abandoned food. Gill silk rot with mud, Gill cover inside the epidermis hyperemia, often corroded into a round transparent hole, commonly known as "open skylight". After the Gill valve of grass carp was infected with myxococcus, the tissue in the diseased area showed different degrees of decay, ulcer and invasive bleeding. This disease can occur in herring, grass carp, bighead carp and other farmed fish, especially grass carp. The water temperature is below 15 ℃, which is generally rare. About 20 ℃, it becomes popular.

[preventive measures] the water depth of 1 meter per mu of water surface is sprinkled with 50 ml of "germicidal red" in the whole pool and used every 15 days. Or add 0.5% "Yukuan No. 2" to the bait and feed it every 15 days. Before stocking, the seedlings were diluted with "seed soaking agent" according to the ratio of 1 ∶ 5000, and the medicine was bathed for 3 minutes for 5 minutes.

[treatment method] the water depth of 1 meter per mu of water surface is sprinkled with "germicidal red" 100,125 milliliters in the whole pool, and the effect is better with the use of "Yukangle No. 2". If the condition is serious or fulminant disease occurs, 1.5% "Yukang No. 1" can be added to the bait for 3 to 5 days as a course of treatment.

Silver carp quadrupole disease

[disease characteristics] it is caused by silver carp quadrupole parasitic in silver carp gallbladder. Silver carp quadrupole infects silver carp fry in June and July, is in metamorphosis stage in overwintering period, and forms the first batch of mature spores in late overwintering period, often complicated with water mildew and oblique tube disease, causing a large number of diseased fish death, and a small number of parasitic symptoms are not obvious. In severe cases, it can cause emaciation, blackening of the body, punctate hyperemia or exophthalmos around the eyes, yellow at the base of the fin and abdomen, yellowish or pale liver, large gallbladder, full of yellow or yellowish brown bile, yellow mucus in the intestines, and water in the body cavity of some diseased fish.

[control method] ① cleans the pond thoroughly with quicklime, which can kill the spores in the bottom silt. ② strictly implements the quarantine system. ③ strengthens feeding and management. Enhance the resistance of fish. ④ found that the sick body was removed in time and buried deep away from the water source.

Vertical scale disease

[characteristics of the disease] the body surface of the diseased fish was rough, some of the scales were loose in shape, the base of the scale was edema, and translucent or blood-colored exudate was accumulated inside. The fin is rotten, the base of the fin is congested, the abdomen is dilated, and the eyeball is protruding. The diseased fish swam slowly, had difficulty breathing, had an upward abdomen and died after 2-3 days. The disease mainly harms carp, crucian carp, grass carp and silver carp, and is prevalent every spring.

[preventive measures] after each fishing net in winter, the water depth of 1 meter per mu of water surface is sprinkled with 50 milliliters of "germicidal red".

[treatment] the water depth of 1 meter per mu of water surface was sprinkled with "germicidal red" 100,125 milliliters in the whole pool, and in severe cases, it was used 2 times in a row, or 1.5% of "Yukuan No. 1" was added to the bait for 3 days.

Finger ring disease

[characteristics of the disease] the pathogen is ring worms. When the disease is serious, the Gill filaments of diseased fish are swollen, mucus increases, and breathing is difficult, which can cause a large number of seedlings to die.

[control method] ① 90% crystal trichlorfon 0.3 ~ 0.7ppm was sprinkled in the whole pool. ② worm sweep is sprinkled in the whole pool of 130ml ~ 170ml / mu / m. If the condition is serious, it can be used again every other day.

Acne disease

[characteristics of the disease] at the initial stage of the disease, small white spots appeared on the body surface of the diseased fish, covered with white massive mucus. With the development of the disease, the number of white spots increased, and the epidermis of the focus gradually thickened, forming paraffin-like hyperplasia, similar to acne, so it was called "acne disease". It mainly harmed the 2-year-old carp before and after overwintering, from autumn to early winter and spring, when the water temperature was 10: 15 ℃. In recent years, due to the development of cage high-density culture technology, the disease is becoming more and more serious, and the incidence is gradually increasing.

[preventive measures] after the beginning of spring, the water depth of 1 meter per mu of water is diluted with 50 ml of "germicidal red" or 200 ml of "high efficiency sterilized iodine" and sprinkled in the whole pool, once a week.

[treatment] after the fish began to feed, 0.2% "hyperconcentrated photosynthetic bacteria" and 0.3% vitamin VC were added to the diet to improve the immunity of the fish.