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First, sick fish detection
1. The appearance of the body surface of the test body is covered with star-shaped mucus covered with body, congestive points, lid and oral congestion, pale silk color, individual was patchy, pectoral fins, anal fins showed congestive edema, exophthalmos, abdominal enlargement, Soft to touch, filled with water, malformed, anal redness.
2. Anatomical detection of hepatic enlargement was purple, in which the individual diseased fish livers had grey-white spotted diffuse necrosis lesions; subcutaneous hydronephrosis, multiple abdominal cavity clear ascites, bleeding spots in the mesentery, gonads, and abdominal wall; hindgut filled with foamy mucus substance , Local necrosis. In some of the diseased fish body, there is also found in the intestinal wall "flesh", which is a diseased tissue, slightly milky white.
Second, the pathogenesis of the pathogen of Aspergillus nidulans is Fibrobacter acidiformis. The bacteria are widely distributed in the natural world. They are normal colonies of human and animal intestines. They are opportunistic pathogens. The skin and intestinal tract are the invading portals for pathogens of ascites. When the skin is injured, pathogens can invade the body and cause the disease. The main causes of trauma are net fishing damage and parasite parasitic damage. In addition, due to the feeding of spoiled bait, the Ukrainian infestation caused normal colonies in the gut to become disordered, creating an opportunity for the invasion of pathogenic bacteria.
Third, prevention and control measures
(1) The main reasons for the poor quality of culture ponds caused by the improvement of water quality for the purpose of improving the water quality of the special pond cultivation are as follows: First, the breeding density is too high. In order to maximize the benefits, farmers constantly increase their stocking densities and often exceed the self-purification capacity of water bodies. Regular adult fish farming, each 667 square meters put 100 grams of about 3000 to 5000 fish species specifications more suitable. With the development of Wuyi aquaculture, the culture mode of Wuyi has gradually changed from polyculture to single-cultivation, thus making the water ecosystem increasingly simpler and the water environment more vulnerable to damage. In order to ensure the high dissolved oxygen in the water body and the activity space of the fish body and reduce the density of the water body pollutants, the aquaculture pond should control the breeding density and recycle the polluted water to avoid the reuse of the sewage caused by the crossover of the water inlet and the drainage system. 20 grams of lime are used to regulate water quality per cubic meter of water during aquaculture every 20 days, while ponds with “bloom†can be changed or filled with water, or 1 g to 2 grams of complex copper can be removed per cubic meter of water.
2. Standardize the breeding operations in the process of stocking, pulling nets, etc. Carefully to avoid causing physical stimulation to the fish. Once the fish is subjected to strong stimulation, its physiology will change, make a stress response, thus consuming physical energy, in the sub-health In the state, the disease resistance is reduced, which is conducive to the invasion of C. bergii; on the other hand, careful operation can reduce the physical damage to the fish surface and reduce the chance of pathogen invasion.
3. Feed healthy feeds Feed healthy and nutritious feeds to enhance the fish's constitution and ensure its resistance to pathogens. In recent years, due to the expansion of the farming scale, the local bait fish cannot meet the requirements. Therefore, there has been a large influx of frozen freshwater fish in the sea. These frozen fish have been refrigerated for more than 30 days, and vitamins and other nutrients have been greatly reduced. Some individuals have already experienced yellowing. Fatty acid failed to produce a lot of toxins, which seriously affected the quality of feeding. However, T. sinensis, which has always been fed with fresh fish, has no tumor disease.
4. Asparagus ascite disease after the onset of the rapid onset of ascites, and the treatment will not occur in time after the onset of disease, once the disease should be dealt with immediately, depending on the situation remove sick fish, dead fish, inject new water or change the water, while feeding drugs Such as the use of sulfamethoxazole, kanamycin treatment of ascite disease more significant, every 667 square meters can also be Quanchiposa lime 50 kg or penicillin 4 million units, streptomycin 5 million units, continuous sprinkling for 3 days, depending on If necessary, apply the medicine for 2 days if necessary.
The seedling of Aspen Ascites is a high-quality insecticidal and antibacterial herbal medicine developed in recent years by the Fish Disease Prevention and Control Group of Hunan Agricultural University. It not only does not affect the growth of fish, but also has low toxicity and no drug residue. Food appetite, promoting blood circulation, collaterals, protecting the liver and protecting the gallbladder were performed in the Dongjiang Reservoir area of ​​Zhuozhou City and the Wuyi Concentrated Culture Area around the Dongting Lake, which has a significant effect on the prevention and treatment of the secondary disease of asparagus.
Diagnosis and Treatment of Asthenospermia
The high-density culture of Chinese black oysters can easily lead to the occurrence of various diseases in black locust. Among them, asparagus disease is one of the most serious bacterial diseases in recent years. The disease is contagious, has an acute onset, and has a high mortality rate, causing large economic losses to farmers. The incidence of ascites following Wuhuan’s ascites is even higher than that of Wuxi’s ascites. The incidence rate is over 90% and the mortality rate can reach 100%.