Control of Fusarium Disease in Shrimp Culture
(1)Fusarium solani, F.oxysporum, F.tricinctum and F. graminearum were the pathogens. Thalli are filamentous branches, often separated. The reproductive mode is to form megaspores, microspores and pachyspores. The megaspores are sickle-shaped, hence the name Fusarium.
(2)Symptom Fusarium parasitizes in the tissues of head, chest, gill, appendages, body wall and eyeball of diseased shrimp, and the tissues of parasitized places have melanin precipitation and are black. Parasitism in the gills caused by gills tissue necrosis and blackening. Some people call it "black gill disease."
(3)Diagnosis Because the main symptoms of fusarium disease are often similar to brown spot disease and black gill disease caused by bacteria, samples must be taken from the focus for observation under a microscope. If hyphae and conidia are found, the diagnosis can be made.
(4)Epidemic Situation This disease is a kind of prawn, crab kind harm very big disease. All kinds of prawns, lobsters and crabs can be infected in seawater, the infection rate is as high as 70%, and the accumulated mortality rate is 90%(such as California prawns). At present, it mainly occurs in artificial overwintering parent shrimp in China. Shrimp disease control period rarely seen.
(5)Control ① Disinfection treatment with 6.0× 0.00001 sodium dichloroisocyanurate before stocking can effectively kill conidia in the pond. (2) Wash the parent shrimp with 300× 0.00001 potassium permanganate for 5 minutes before entering the overwintering pond, and prevent the shrimp from being injured. (3) The parent shrimp was cultured in disinfected and filtered water without Fusarium contamination.
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Preparation of cultured Penaeus vannamei before stocking
The preparation work before stocking of Penaeus vannamei is mainly to renovate shrimp ponds, drainage and irrigation systems and other production facilities, drug cleaning ponds and culture basic bait, etc. First, shrimp pond finishing (1) the purpose of the drying pond is to restore the bottom of the pond. In general, shrimp ponds should drain water after harvest.
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The disease mostly occurs in the late stage of big ear larvae, and it is more likely to occur during the high temperature period from June to July every year and when the larval culture density is high. The disease has been found in Shandong and Liaoning provinces, and the incidence is increasing year by year. The main symptoms of death are as follows: increase of gastric wall in larvae.
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