Prevention and treatment of common diseases of fish in spring

1. Gill rot disease

Pathogenic myxococcus.

Symptoms of diseased fish body color black, alone, waste 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.

Prevent water depth of 1 meter per mu of water surface (1 mu = 667 square meters) with "germicidal red" 50 ml whole pool sprinkle, use 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 water depth of 1 meter per mu of water surface with "germicidal red" 100,125ml whole pool sprinkle, combined with the use of "Yukangle No. 2" is better. If the condition is serious or fulminant disease occurs, 1.5% "Yukang No. 1" can be added to the bait for 3-5 days as a course of treatment.

two。 Vertical scale disease

Pathogenic water type polar Trichoderma punctatus.

The body surface of the diseased fish is rough, some of the scales are loose ball, the base of the scale is edema, and the internal accumulation of translucent or blood-colored exudate. 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.

Prevent every time after pulling the net out of the fish in winter, the water depth of 1 meter per mu of water surface with "germicidal red" 50 ml of the whole pool sprinkle.

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

3. Acne disease

The pathogenic virus.

At the initial stage of the onset of symptoms, 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 continues to increase, and the epidermis of the focus gradually thickens, forming a paraffin-like growth, similar to acne, so it is called "acne disease". It mainly harms the 2-year-old carp before and after overwintering. From autumn to early winter and spring, the water temperature is 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.

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 "highly effective sterilized iodine" and sprinkled in the whole pool, once a week.

After the treatment of fish began to eat, 0.2% "super-concentrated photosynthetic bacteria" and 0.3% vitamin VC were added to the diet to improve fish immunity.

4. Water mildew

Pathogenic water mold.

The symptoms are commonly known as white disease and skin mildew. When the fish is injured inadvertently in operation and transportation, or frostbite caused by low temperature, or primary focus caused by parasite or bacterial infection, mold spores invade from the fish wound, absorb nutrients from the skin, propagate rapidly in the injured focus, spread and expand, and grow into cotton hair hyphae. The mycelium adhered to the wound tissue, resulting in skin ulceration and tissue necrosis. with the expansion of the focus, the fish swimming disorder, loss of appetite, weak death. The disease often occurs in the low water temperature season below 20 ℃, and is most prevalent in early spring and late winter. In closely raised overwintering ponds, fish that are thin or hungry in spring are more likely to suffer from the disease.

Before entering the pond, the fish fry were diluted with "seed soaking agent" according to 1 ∶ 5000, then the medicine was bathed for 3 minutes. After entering the pond, the fish fry was sprinkled with "germicidal red" according to the water depth of 1 meter per mu of water.

Treatment water depth of 1 meter per mu of water surface with "germicidal red" 100,125 milliliters, sprinkle the whole pool.

5. Cucumber disease

The pathogen has many children and small melon insects.

When a large number of symptomatic parasites are parasitized, it is visible to the naked eye that the fish's body surface, fins and gills are covered with white dot cysts, so it is also called "white spot disease". In severe infection, because the worm invades the skin and Gill surface tissue of the fish, it causes the proliferation of the focus tissue and secretes a large amount of mucus, forming a white film to cover the surface of the focus, and the fin rots.

Before stocking, the water depth is 1 meter per mu of water, 50 grams of "fishes and insects 2B" are dissolved in 2000 times water, and then the whole pond is sprinkled with disinfection, or the seedlings are diluted with "seedling soaking agent" according to the ratio of 1 ∶ 5000 for 3 minutes.

After treatment, according to the water depth of 1 meter per mu of water surface, dissolve with 50 grams of 2000 times water, sprinkle and disinfect the whole pond, and use it again 2 days later. In case of severe infection, "Yukangle No. 1" can be added to the diet at a rate of 1.5% and fed continuously for 3 to 5 days.