Control measures of White spot Syndrome of cultured Penaeus vannamei
1. Main symptoms.
In the later stage of the disease, white spots appeared in the subcutaneous carapace and appendages of the shrimp, and the softening of the carapace was also more common. the head and chest carapace was easy to peel off, the shell was separated from the dermis, and the body color was dark or reddish. The hepatopancreas is brownish yellow and fragile. The disease is fulminant and the mortality is high.
2. Prevention and control methods.
① chooses and buys disease-free shrimp seedlings.
② adds "Xianbikang" to the feed all the year round and bioactive substances containing nucleosides, amino acids, peptides, enzymes and sugars, such as "Baogantai", "Xiankang Su" and so on. The main function is to stimulate the immune system of shrimp and stimulate the phagocytosis of macrophages in the body so as to improve the ability of disease resistance. It is helpful for shrimp enzyme system to adapt to the changes of internal and external environment and enhance the anti-stress ability of shrimp. Repair the damage of hepatopancreas caused by virus infection and restore the vitality of hepatocytes.
During the epidemic season of ③ disease, sprinkle 75,150kg / ha of raw lime water or "strong disinfectant water" every 15 days, or sprinkle it once a week with "shrimp disinfectant", "white shrimp methotrexate" and "Baoxiangding" in the whole pond to adjust the water quality.
In the whole culture cycle, ④ often sprinkles "Lvshuibao", "live water bacteria", "compound photosynthetic bacteria", "Shuangshuibao" and so on to regulate the water quality.
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Techniques of hoarding and raising river crabs in winter
River crabs are generally concentrated on the market from the beginning of October to the end of November every year, so the quantity is large and the price is low, and the breeding benefit is not high. Hoarding and raising river crabs in winter is beneficial to stagger the season of centralized listing and increase the listing price of river crabs, so as to obtain the best economic benefits. 1. The pond needs
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Control of carapace canker (Brown spot) of cultured Shrimp
The main results are as follows: (1) the bacteria that can be isolated from the focus are Vibrio, Pseudomonas and Flavohacterium. It is a gram-negative bacilli. (2) there are dark brown or black spot ulcers on the body surface carapace and appendages of shrimp with symptomatic ① disease.
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