Polyketosis
Depigmentation and activity affecting the zoea larvae severely results in the death of the zoea.
Incidence: It often occurs repeatedly and is susceptible to drug resistance.
Prevention: Water Po (300 cubic meters to 500 cubic meters of water) Quanchiposa, used in conjunction for 2 days.
Vibriosis
Mainly for the back of the spine red, backstab broken and so on.
Onset: Deterioration of water quality, prevention of Vibrio spp. Proliferation: Maintain good water quality, protect water conservancy, and rejuvenate the whole pool with good water.
Treatment: sprinkling with Hundred grams of Pulsation (300 cubic meters of water), once every 3 days to 5 days.
Filamentous bacteria
Filamentous bacteria mainly attach to the body surface of the larvae, and mainly damage the crab eggs, zoea larvae, and big eye larvae. Due to the gravitational action of the filamentous bacterium, the swimming ability of the wavy larvae weakens, and finally it dies. No pathological damage or nutritional insult was found, but the harm was fatal. .
Incidence: The main manifestations are acute types and long epidemics. The eco-environmental factors of the occurrence of filamentous bacteria are mainly related to the organic concentration, water temperature, and salinity in the nursery system.
Prevention: Regular use of Lushui No. 1 + water conservancy factors in the sunny morning water sprinkling, directed cultivation of single cells and keep the dominant population of beneficial bacteria. In addition, the density of seedlings should be properly reduced, and reasonable feeding can effectively reduce the content of organic matter, reduce the nutritional sources of filamentous bacteria, and ensure good water quality for nursery.
Treatment: There is no special effect method after the onset of the disease. In particular, filamentous bacteria are often mixed with other diseases. The water can be changed first, and then water is used (300 cubic meters to 500 cubic meters of water) Quanchiposa, used for 2 days, can be greatly reduced mortality rate.
Ammonia nitrogen nitrite exceeded
Onset: Abnormal water color, a large number of dead crabs, laboratory water quality will find ammonia or nitrite exceeded.
Prevention: Change the water 1/2, and then Quanchiposa Nitrification No. 1 0.5ppm ~ 1ppm, use 2 consecutive days, do not use disinfectant when this happens.
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