Fungal fish is the most important source of gills, and the sediment and water that have been contaminated by gill-robbing fish are also the source of rotting. The more pathogens in the water, the worse the water quality and the poorer the sediment quality. The greater the density of fish, the more likely the disease will become outbreaks and epidemics.
In the Jianghan area of ​​Hubei Province, raising grass carp is not used as a vaccine. Grass carp carp disease causes great losses to fish farmers every year. Once the disease occurs in fish ponds of fish farmers, they are constantly pest-killed and sterilized. A lot of dead fish have not been controlled. Is it really clear about the origin of the pathogens and how do we start with prevention and treatment?
Gill pathogens: It is generally believed that gill gill disease is caused by Aeromonas sp., Streptomyces pilosicoli, Myxococcus, Trichoderma, Cyclospora, and Lepidoptera.
Symptoms of gill rot: Diseased fish, fish and fish have dark hair. The inside surface of the gill cover is congested. The middle part often becomes erosive or has a round, bright window. The gill filaments are swollen or congested, the mucus is increased, and the end is incomplete. .
Etiology
Bacterial rotting: The disease caused by bacterial infection caused by cocoon erosion, the early onset of silk congestion, swelling, there is a boundary between bright red and black silk; followed by silk necrosis, rot, there are anemia and blood loss, there is silt And to open the skylight, should be based on the severity of the disease to the right medicine (according to water quality and fish size, physical condition, as well as the weather conditions at that time to consider what the next drug).
Fungal gizzard: A disease caused by a fungal infection. Microscopically, it can be seen that there are black filaments in the gill filaments, and when it is severe, there are dead tree-like substances in the gill filaments. The disease will affect the normal function of the fish reel. When the water quality deteriorates and the weather suddenly causes the oxygen in the water to decrease, the fish tends to float.
Parasite rot: The type of parasite that causes damage and damage to the cerum is observed from the iliac crest. Chinese sturgeon can be judged by the eye, but the trichomonads, slug worms, and ring worms should be diagnosed with a microscope, and then be judged according to the severity. To remedy the problem, after the insecticide, it is necessary to sterilize the body of the water, prevent the injured fish from being infected by bacteria, and then be injured again. Afterwards, attention should be paid to the regulation of the water quality and the body of the fish should be conditioned.
Nutrient gills: The sputum of normal fish is bright red, and nutrient grubs will cause gill filaments to swell and darken. Some people may say that the deterioration of the water environment and the stimulation of the drugs will also cause the gills to swell and darken, so they need to be correct. Judgment and diagnosis (to confirm the diagnosis within the body of the fish), so you can use anti-stress drugs and internal herbal medicine, nutritional medicine to enhance the fish's constitution.
Drug-based rotting: The abuse of insecticides and bactericides by fish farmers, poor water quality, and other causes have caused fish rotting to be rotted, and most of the silk edema is white, defective, and has bacterial infections. This time can not use stimulant drugs, otherwise it will aggravate the condition, the disease is usually used mild drugs to adjust the water quality, change the water quality environment and nutrition, and also to internal medicine to detoxify and enhance nutrition.
Environmental rotting: Water environmental rotting is often the accumulation of water quality organic matter and toxic and harmful substances in water quality stratification, which makes the water body appear yellow and turbid, due to the sudden changes in the weather caused by the lack of oxygen in the water caused by toxic gurgling. The general symptom is that the fish has a floating status on the day of the weather change; the next day, the food is declining and there is no passion; on the third day, there is a phenomenon of sideline, grubbing and dead fish.
Prevention
Prevention: In the epidemic season of fish disease, insist on adjusting the water every 15 days. If you use Tongwei Companion 2 (4 mu/bag - 6 mu/bag, the main ingredient is Bacillus), change the bottom of water to control the stability of the water; To promptly consume Tongwei Fish Fluorine Starfish (1000kg eat fish/bags, the main ingredient is florfenicol) + enteritis three disease Kang (1000kg eat fish/bag, the main ingredients are Daqingye, Pulsatilla, rhubarb, berberine, etc. )prevention. In the epidemic season of fish disease, when grass carp is transported and divided into ponds, it is necessary to do a good job of eliminating fish to prevent fish diseases. In particular, small grass carp 150 g and below 150 g are particularly prone to gill disease, which is often the cause of water quality and pond mud. Cause grass carp reeling dysfunction, and this water environment is particularly prone to ringworm, worms, bacteria, etc. caused by the rotting; water transfer to the bottom is fundamental, found that eating conditions are abnormal (such as fried group, found Grass carp, a flock of fish, sinking at the end of the meal), they have to cause a high degree of attention, catch fish diagnosis, and take medication measures to prevent.
Treatment: First of all, it is necessary to distinguish what is the cause of the rot. The unilateral rotten fish is unilateral, and the size and resistance of the fish are strong and weak. There are also changes in water quality and internal organs at that time. For example, the average 500 g of grass carp has 4 to 5 strips. The feed is normal and the water is light green. The transparency is 20cm, the physical and chemical indicators of water are normal, there are 15 sludges, which are bacterial rotting. There are 10 -15 deaths. In the day, povidone-iodine 500ml/2mu -500ml/4mu, 1 day after the use of dioxide Chlorine 150g/mu - 250g/mu, taken on the second day orally, dispensed by a professional technician. What should we do with the comprehensive slack? The method is as follows: first deal with the bottom of the pond, then remove the toxins from the water, ensure that the dissolved oxygen is sufficient, detoxify for 3 hours, then use 200 grams of chlorine dioxide/mu of water body, and it can be used in rainy days); Disinfection uses mild drugs to control the disease; Insecticide is to see how much silkworm mucus, mucus is more than treated with Arbutin + ferrous, it is best to use microscopy and visceral examination, the situation is serious, then 11 o'clock with dry powder particles of oxygen enriched powder; At that time, the situation was determined; oral administration was fundamental, the condition was well controlled, and the water was transferred promptly; prevention of the disease rebound, should be added under the guidance of a professional technician in the case of adding fish, and the procedure was followed in the treatment of the technician. Under the operation.
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