Disease prevention measures for releasing fish fry in spring
With the rise of water temperature in spring, germs are easy to reproduce. In addition to selecting high-quality fish species with neat specifications and no harm to the body, we should also pay attention to preventing the occurrence of diseases. The main measures are as follows:
The whole pond and tools should remove weeds, remove excessive silt, plug cold loopholes, flatten the bottom of the pond, and then sprinkle all over the pond with quicklime, bleach and other drugs. Fish nets, buckets and other tools should be exposed to the sun for about 2 days before use, or they can be soaked in high concentration of raw lime water, bleach and other solutions for disinfection.
Fish body calcinations in order to maintain the resistance of fish species, they should be calcined in nets or densely in cages before stocking, so as to enhance their physique and improve the flexibility of fish bodies.
The water in the pond is generally light in spring, and there is less plankton in the water. Fish species may lack natural bait after entering the pond. Organic fertilizer can be applied in advance, or chemical fertilizer can be applied temporarily. The best way is to put biological fish fertilizer.
Fish fingerling disinfect fish before going into the pond, medicine is used to bathe the fish body to kill pathogenic microorganisms and parasites attached to the skin and gills of the fish body. The common method is to wash the fish body with iodine preparation, salt water, Chinese herbal medicine and so on. Firmly resist the use of state-banned drugs, such as malachite stone, and other fish drugs, copper sulfate, trichlorfon and other drugs can also be selected for fish disinfection. The specific choice of drugs should be flexibly decided according to the specific situation and the purpose of use, and can also be used under the guidance of aquatic products professional and technical personnel.
Pay attention to immune prevention of hemorrhagic disease, enteritis, Gill rot and other common diseases of grass carp. When putting grass carp seed, grass carp can be injected with immune vaccine, which can also achieve the purpose of preventing fish disease.
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A STUDY ON HYPOPHILA DISEASE OF EUPHILA EELLUS
In recent years, large-scale intensive culture of European eel has been increasing in China. However, with the expansion of culture scale and the continuous increase of culture density, various problems affecting the survival rate of European eel are increasing day by day, and the outbreak infectious disease of European eel caused by hygrophilic bacteria is one of the outstanding problems. A series of preliminary studies on the physiological and biochemical characteristics, pathogenic factors and pathogenic conditions of hygromonas were carried out in order to provide a powerful theoretical basis for the prevention and control of European eel outbreak infectious diseases and to promote European eel culture to be stronger.
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Four services do a good job of prevention and control of cage fish diseases
Recently, it is the season of high incidence of cage fish diseases. The fishery authorities in Ningbo City, Zhejiang Province have grasped four services to comprehensively carry out disease prevention and control work. First, science and technology to the countryside service. Disease forecasters in various areas regularly go to each reporting point and the surrounding cage culture areas to learn about the situation, and the disease forecasters at the same level in the city are guaranteed to carry out services at the grass-roots level twice a week (1-2 days each time). Second, rapid response service. If the fisherman encounters a sudden disease, the organization experts will rush to the scene within 2 hours.
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