Common knowledge of prevention and treatment of common fish diseases in fish culture

Aquaculture belongs to the aquaculture industry with high input and high output. in the process of aquaculture, the control of fish disease is directly related to the yield and benefit of aquaculture, so it is particularly important to prevent and control fish disease in aquaculture. The so-called prevention and treatment of fish disease is the prevention and treatment of fish disease in the process of fishery culture. In the prevention and control of fish diseases, the key is prevention, giving priority to prevention. If the prevention work is not done well, once the fish disease occurs, it not only needs a lot of drugs and time to treat, but also seriously affects the normal growth of fish and causes significant economic losses. According to the situation of aquaculture in Jinggu County, the prevention and control methods of the following common fish diseases are mainly introduced.

1. Enteritis

Harm to fish schools: grass carp, carp, tilapia, silver carp, bighead carp.

Symptoms: enlarged abdomen, red and swollen anus, light pressure on the abdomen, light yellow or blood pus flowing out of the anus, dissection of the fish abdomen, water in the abdominal cavity, intestinal wall hyperemia, inflammation, light foreintestine or hindgut showed red, the heavy whole intestine was purplish red, the intestines were generally anorexic, filled with yellowish mucus or blood pus, the diseased fish had black body color, lost appetite, moved slowly, and wandered alone.

Prevention: 1. Strengthen the management of feeding, pay attention to keep the water quality fresh, and clean up the leftover straw residue of the fish. 2. Soak the fish fry with 10ppm bleach for 20-30 minutes before stocking, and sprinkle 1ppm in the whole pond every half a month during the onset season.

Treatment: 1. Add 25 grams of chopped garlic and 300 grams of salt per kilogram of feed twice a day. 2. Feed 50 grams of Changyanling fish medicine ingredients twice a day, 3 days a course of treatment.

Second, water mildew.

Harm to schools of fish: generally speaking, schools of fish with wounds are likely to suffer from water mildew.

Symptoms: the motile spores of skin mold sneak into the wound of the fish, absorb nutrients, grow rapidly into hyphae, one end of the hyphae extends into the muscle, spread and spread, forming a gray cotton wadding visible to the naked eye, due to the intertwining adhesion between the hyphae and the cell tissue of the fish wound, so that the fish tissue necrosis, at the same time, with the increase of hyphae, the fish body burden is overweight, resulting in swimming disorders, loss of appetite, emaciation and death day and night.

Prevention: 1. Fish ponds are disinfected and cleaned with quicklime to avoid fish injury in the process of net transportation. 2. Try to avoid breeding with injured parent fish.

Treatment: 1. Sprinkle 0.4 kg salt and 0.4 kg baking soda mixture throughout the pool per cubic meter of water. 2. Sprinkle 5 kg of calamus, 3 kg of salt and 20 kg of human urine in the whole pool. 3. Formalin 0.5ppm is sprinkled all over the pool.

Third, Gill rot disease

Etiology: bacterial Gill rot disease can be divided into two types: caused by columnar slime mold and columnar fibromyxomycete respectively.

Symptoms: the fish are blackened, have difficulty breathing and float on the surface of the water, Gill swelling, light color and severe anemia. There is an acute infection when purplish red, mucus, dirt, plaque, Gill decay, but generally less than the defect, the sick fish die.

Epidemic: tilapia is easy to suffer from Gill rot disease in the culture water with high density, which makes the fish die.

Prevention: 1. Timely discharge of sewage, replacement of new water, conditions can appropriately increase the water temperature. Still water can be kept with EM (effective microflora) sprinkled throughout the pool to inhibit the reproduction and infection of harmful bacteria. two。 The whole pool is sprinkled with quicklime to make the pool water at a concentration of 2.3-3.0 g / m3.

Treatment: 1. The whole pool was sprinkled with chlorine preparations, such as trichloroisocyanuric acid (strong chlorine) 0.3 g / m3 or dichloroisocyanurate 0.5 g / m3 (0.5 g / m3) for 3 days. two。 The whole pool is sprinkled with potassium permanganate to make the pool water at a concentration of 2.3-3.0 g / m3. 3. The whole pool is sprinkled with formalin to make the pool water at a concentration of 30 grams per cubic meter.