Gill-rot disease of prawn
[Cause] The disease caused by bacteria.
[Symptoms] The diseased shrimps have black silk and local ulcers. This is the most typical symptom of the disease, and the others have no obvious lesions.
[Popularity and Hazard] Occurrence of Macrobrachium rosenbergii and shrimps in shrimp culture ponds, the onset time is summer and autumn, September is the peak, sick shrimp died due to respiratory obstruction, and when the disease is heavy, the daily mortality rate can reach the stocking amount. 6% to 10%, more serious harm.
[Diagnosis] Visually inspect the larvae and other parts of the diseased shrimp for diagnosis.
[Prevention] 1 scientific stocking, according to local conditions, to maintain a reasonable stocking density, water planting appropriate amount of water to maintain fresh water; 2 regular use of quicklime to disinfect water body, the amount of 15 mg / l Quanchiposa; 3 incidence season, with bleach 1 mg / L Quan Quan spit disinfection, 1-2 times a month.
[Treatment] 1 Disinfect with 0.2 mg/L trichloroisocyanuric acid or 0.3 mg/L Youquan Chloride Quanchipue, once a day, 1 time after the next day, and 1 time after 15 weeks with 15 mg/L lime. .
[Precautions] When using trichloroisocyanuric acid in the shrimp pond, sunny days should be selected. It is advisable from 9:00 to 15:00 to avoid the use of medication in the evening. Otherwise, it may cause shrimp to float at night. Therefore, after application, it is necessary to Strengthen the patrol pond so that timely detection and measures can be taken.
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