Several Causes and Treatments of Penaeus vannamei Swimming Pond
During the cultivation of P. vannamei in South America, farmers often find the shrimp pond phenomenon. There are many reasons for inducing prawn swimming pools, such as abrupt changes in temperature, water quality, deterioration of sediment quality, lack of oxygen in ponds, disease infections, and drug poisoning. Generally speaking, there are disease-free swimming ponds and anaerobic recreational ponds in shrimp ponds. Stressed ponds, toxic ponds, physiological and migratory ponds. Only careful observation and analysis of the causes of the shrimp ponds and targeted measures can effectively curb the shrimp ponds and reduce losses. The causes and treatment methods of several kinds of prawn swimming ponds are summarized below.
Stressful pond
Due to changes in the external environment (such as heavy rain, cold weather or sultry and low-pressure weather), drastic changes in the salinity of the water environment, dissolved oxygen, etc., exceeding the adaptability of the shrimp, the physiological function is reduced, the tissues and organs are damaged, and the immunity is reduced. Under stress conditions, there is a cluster of swimming pools along the surface of the pond around the pond, where the swimming is normal. When artificially stimulated, it dive into the bottom of the pool. Treatment method: Turn on oxygen, quickly take corresponding measures to restore the original condition of the aquaculture environment.
(1) Anoxic pan-tang: The shrimp ran wildly on the surface of the water and sank to the bottom of the pool and died. Occurrence of sweltering nights or low-pressure days at dawn. Quickly turn on oxygen, add new water, and spray oxygen at the bottom of the pellets around the pond to increase oxygen, splash organic detoxification with detoxification, etc., and use 500 ml to 1000 ml/mu.
(2) Drug-induced poisoning: Pesticides or heavy metal poisoning cause the shrimp ponds to swim. The shrimps swim wildly on the surface of the water. In severe cases, a large number of shrimps jump to the shore of the shrimp pond and die. The oxygen is turned on and the water is changed by 1/3-1/2. ,Spray particles of oxygen around the pond in time. Quanchiposa 2ppm-3ppm Haizhongbao and Green Wellcome or detoxification water Bao and other organic acid detoxification, the amount of 500 ml -1000 ml / mu.
(3) sudden changes in temperature or ponds, such as "cold algae," trigger shrimp ponds: Quanchiposa during the cold wave 0.5ppm-1.0ppm vitamin C, amino selenite, reducing the shrimp stress response; after the storm, the surface water in time, increase the power Oxygen is stratified by a water-repellent body, and 0.5 ppm of ionized calcium is splashed in the whole pool to promptly add calcium and magnesium trace elements to the prawn after a stressful clam shell and restore constitution. "Yao algae" caused by the pond should be turned on immediately oxygen, Quanchiposa 1.5ppm efficient water purification Po and 1ppm green Weikang and other organic acid detoxification. When the weather turns to be good, apply appropriate amount of unicellular algae growth hormone and Bacillus to re-cultivate algae.
(4) The pool water is lean, insufficient natural food, and the transparency is too large to trigger the collective bait fishing pond around the pond. When swimming is normal and artificially stimulated, it quickly dive into the bottom of the pool. Increase the amount of feed, timely application of fertilizers and fertilizers, fertilizer paste and EM bacteria liquid to cultivate the natural algae phase, so that the water and fertilizer cool, transparency is maintained at about 30 cm.
Diseased swimming pool
Shrimp ponds caused by diseases often show various typical pathological symptoms on the body surface, appendages, gills, hepatopancreas, gastrointestinal tract, etc., manifested as outlying roaming, slow swimming, and unbalanced, when artificially stimulated, the shrimp response Insensitive, some spinning on the water or moving up and down the amorphous. Finally, he died at the bottom of the pool and died. The diseased shrimp touched tentacles, tail fan, and body color became red. The pigmented spots on the body turned red and became sparse. The intestinal tract was dark and red, and the food in the jejunum or intestine was not full and was broken. Parasites, bacterial, and viral infections can all trigger shrimp abnormalities.
(1) Virulent disease triggers swimming pond: There is red body disease, white spot disease, infectious muscle whitening, necrosis, acute hepatopancreas necrosis, etc., acute disease shrimp color red, intestinal empty food, body pigment The point becomes larger and becomes more sparse. The head and chest shells are often hard (the shrimp looks like it is difficult to look at from the outside). The prawns are unable to clam shells due to sickness and they die a great deal within days. Treatment method: Thoroughly sterilize with chlorine dioxide before putting the seedlings. Regularly added to the feed
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