Ecological Control methods of Common Diseases in Monopterus Albus

Cold

[etiology and symptoms] due to the sudden change of water temperature of more than ±5 ℃, the normal physiological factors can not keep up with the change of external temperature, resulting in the imbalance of cortical osmosis, inhibition of humoral metabolism and obstruction of thermoregulation pathway. When the disease occurs, the skin of Monopterus Albus loses its original luster, and in severe cases, it is in a state of shock. The disease often occurs in summer.

[prevention and control methods] ① strengthens the control of water temperature and water quality, and the temperature difference of water temperature is less than ±5 ℃ when changing water. When changing water in ②, the water should be washed into the buffer pit in the pool and injected by trickle. The new water replaced by ③ should not exceed 1x3 of the old water in the whole pool each time. When the comprehensive condition is good or the water quality is extremely deteriorating, it can be changed more appropriately, but the water injection should not be too urgent.

Have a fever

[etiology and symptoms] the disease is mainly due to excessive artificial stocking density and failure to change water in time, resulting in a large amount of mucus secreted by Monopterus Albus to accumulate, ferment and release a large amount of heat, resulting in a sudden increase in water volume and a decrease in dissolved oxygen in the water. it suppresses and destroys the normal metabolism of Monopterus Albus and causes the disease of Monopterus Albus. The diseased eel is characterized by cavitation, neuroticism, entanglement and tumbling, body surface mucus shedding, head swelling, extreme uneasiness and so on.

[prevention and control methods] ① changed the pool water and increased oxygen in the water body at the same time. ② reduces stocking density and changes water in time. ③ sprinkled the whole pool with 0.07% concentration of copper sulfate aqueous solution at a dosage of 5 ml per square meter of water. ④ mixed culture of Misgurnus anguillicaudatus to increase the self-purification ability of water.

Atrophy

[etiology and symptoms] due to excessive stocking density and insufficient bait, the small ricefield eel was suppressed by the big ricefield eel, starved for a long time, the eel shrank, the diseased eel was black, emaciated, big head and thin body. In severe cases, you will lose your appetite and eventually die.

[control methods] ① provides sufficient bait. ② is strictly graded. The stocking density of ③ can be reduced when the feed is short for a long time. In the early stage of ④, fresh bait such as earthworms and maggots should be added in time.

Anoxia

[etiology and symptoms] due to the high temperature of the water body in the eel pond and the intensification of various physical and chemical reactions, the dissolved oxygen in the water decreased and caused hypoxia. At this time, Monopterus Albus can not look up to breathe air, so that the respiratory function of the body is disordered, the blood oxygen-carrying capacity is greatly reduced, and the brain is deprived of oxygen. The sick eel showed frequent probe outside the cave or even did not enter the cave for a long time, spasmodic tremor occurred in the head and neck, and generally died after 3-7 days.

[prevention and control methods] ① strictly carries out water quality measurement and control management to maintain the comprehensive buffering capacity of the water body. During the high temperature season of ②, measures such as increasing oxygen and cooling should be taken in time to prevent the occurrence of diseases. After the onset of ③, the water should be changed immediately and the water should be oxygenated at the same time. ④ fished out the paralyzed and paralyzed eel in time to reduce the load of the water body.