水蛭长见病（Leech disease）.docVIP

水蛭长见病（Leech disease） The fifth section, leech disease prevention and control -------------------------------------------------------------------------------- First, the main cause of the disease The survival ability and disease resistance of leech is quite strong, as long as the scientific breeding to operate, disease occurred in the breeding process will be few, but without scientific management, will lead to the occurrence of the disease caused by the loss of the leech. The main causes of leeches are: (1) the temperature is unstable If the diurnal temperature difference is too large, sometimes hot and sometimes cold, leech will not adapt and sick; do not take measures to cold, will damage the leech causing disease and even death; hot summer, like a shade, water hyacinth and other measures are not taken, the temperature is too high, leech appetite loss, resistance decreased, even directly shaisi. (two) density is too high If the stocking density is 3 times higher than the normal density, it will cause the scope of leech activity, lack of food or uneven distribution, excessive excretion, killing each other, and easily lead to disease breeding and spreading. (three) deterioration of water quality For a long time without changing the water, the pool of excrement, bait large accumulated water, serious corruption, black smelly, harmful bacteria multiply, causing a variety of infectious diseases; sometimes when changing the water injection, by pesticides, industrial wastewater contaminated water will cause poisoning, death, leech. (four) malnutrition; Feeding does not follow the quality principle, leech when hungry, and sometimes eat a spoilage of food, nutrition will not leech if things go on like this, drop resistance, easy to attack. Two, dry disease (1) the cause of the disease; On the banks of the pond, the humidity is too high and the temperature is too high. (two) symptoms Sick leech loss of appetite, less active or inactive, emaciated, weakness, can see the body