White dew has a greater impact on grass carp farming. During the white dew period, the insect bacteria multiply relatively quickly, coupled with the large amount of feeding, the relative physique of growing too fast is also poor, and the cause of death may be caused by bacterial infection after the impact near the food platform, or it may be a bacterial infection after the bite of the insect, in short, the poor physical fitness of the large grass carp in the middle and late stages is the key.
The three diseases of red skin disease, gill rot and enteritis disease are also known as the "old three diseases" of grass carp, which are also the main outbreak diseases in grass carp farming, which will cause a large number of deaths of grass carp every year and bring huge economic losses to the grass carp farming industry. Today we will analyze the grass carp red skin disease in detail.
Red skin disease is also known as red skin plague, rub skin plague, etc., the main manifestation of the body surface of the local or most of the bleeding inflammation, scale shedding, especially on both sides of the fish body and abdomen is the most obvious, in addition to grass carp, blue fish, carp, tuantou bream and other freshwater fish also occur this disease.
The source of infection is water bodies, utensils and fungal fish contaminated with Pseudomonas fluorescentis. Pseudomonas lucidum are conditionally pathogenic. Pathogenic bacteria cannot invade the skin of the fish when the body surface of the fish is intact; only when the fish is mechanically damaged, or frostbitten, or the body surface is parasitically damaged by parasites due to fishing, transportation, and stocking, the pathogenic bacteria can take advantage of the weakness and cause the onset of the disease.
Red skin disease, like other fish diseases, should be prevented and treated early. In normal times, preventive medication can generally be used once a month, and after the fish turn to the pond and go down to the pond, regardless of whether there is injury or not, it is beneficial to prospective medication prevention and control:
1. Before raising fish, use quicklime or bleach powder to sterilize the pond in large doses.
2. Before entering the pond, the fry are soaked with bleach solution.
3. When raising fish every day, do a good job of management to avoid injuries to the fish body.
4. If the condition is serious, it is difficult to have a therapeutic effect. The following are the options for medication and are recommendations only.
Internal administration of antibacterial and anti-inflammatory drugs florfenicol + doxycycline hydrochloride + Lechang eucalyptus essential oil improves the disease resistance of fish bodies, and cooperates with liver protection products to reduce the loss of drugs to the liver.
All in all, in order to reduce the incidence of grass carp red skin disease, reduce casualties and economic losses, it is necessary to enhance the resistance and stress resistance of the fish body, avoid fish body injury in the process of fishing, fishing, transportation, etc., and regularly use Lechang eucalyptus essential oil to deworm and prevent parasitic diseases