analysis of water fish parasitic disease hazards and control measures（分析水的鱼寄生虫病危害和控制措施）.doc

Analysis of water fish parasitic disease hazards and control measures Abstract: Summary harm freshwater fish parasitic diseases of fish, as well as single-celled protozoan parasite disease and multi-cellular epigenetic two categories of large parasites of freshwater fish law of the incidence of parasitic diseases, and parasites disease prevention and control measures. Keywords: freshwater fish, parasites, hazard prevention and control measures With the continuous development of China’s freshwater fisheries, aquaculture density, fish disease incidence and harmfulness is also rising, and has gradually become one of the important factors restricting the development of the domestic aquaculture industry, and parasitic diseases also accounted for a certain proportion. usually the case, most of the parasites on the fish will not produce significant harm, stable water ecosystems, often in a state of equilibrium between host and parasite populations, however, when the drastic change of environment and ecology , parasites, there may be a large number invade host, leading to outbreaks of parasitic diseases, caused great losses to the fishery production. Hazards of parasitic diseases of fish Parasites of fish can cause significant host slow growth, decreased resistance, and even cause death. Dangers of parasitic diseases mainly in the following four aspects: First, the mechanical stimulation and injury. Mechanical stimulation and cause tissue damage is a feature of parasitic diseases Total direct cause fish kills or other lesions resulting adverse consequences. squeeze with obstruction. parasites on the fish’s body parasites often squeeze caused by the organs of the host tissue, causing atrophy, necrosis and loss of physiological function. plunder host nutrition parasites nutrition, taken from the host, the result would be more or less to produce some kind of harm to the host, light performance malnutrition, growth and development of the affected serious cases de