Prevention and treatment of filamentous bacterial disease of cultured shrimp
(1) the pathogens are Leucothrix mucor, TAiothrix, Flexibacter and so on. The shining bacteria are filamentous, unbranched, slightly thicker at the base and thinner at the end, with a length of more than 5 μ m and 500 μ m. The conidia method was used to propagate and develop into new bacteria.
(2) in the diseased shrimp whose symptoms were seriously affected, the Gill of the head, chest nail became dark brown, lost appetite, grew slowly, and molted hard. Shrimp ponds without aerators often lead to suffocation and death of severe patients on the eve of dawn due to the low content of dissolved oxygen in the pond.
(3) the infection of shrimp eggs and larvae and overwintering parent shrimp is mainly diagnosed. The eggs or larvae and the Gill tissues of parent shrimp are made into water seal film, and a large number of filamentous bacteria can be found under microscope.
(4) the prevalence of Mucor is a common microorganism in estuaries and oceans. It can live independently or on the surface of marine animals or algae. Therefore, it may appear in all stages of shrimp life cycle, but only in the case of high density of disease prevention and control, pond water and fertilizer will be a large number of fixed. The cumulative mortality rate of injured shrimp can be as high as 60%. Bright Mucor is widely distributed in shrimp nursery and disease prevention and control fields along the coast of China, especially in the middle and later stage of disease prevention or in the parent shrimp ponds with poor water exchange conditions, closed and semi-closed.
(5) Prevention and control of ① thoroughly clear the pond, disinfect and disinfect, keep the sediment clean and the water quality clean and good. ② is fed with high quality feed to reduce residual bait and prevent organic debris pollution. ③ is sprinkled with chelated copper in the whole pool with a concentration of 0.5 × 0.000001 ~ 0.8 × 0.000001. ④ was bathed with potassium permanganate 2.5 × 0.000001 × 5 × 0.000001 for 4 hours.
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Feed Saving method of raising Penaeus vannamei
Pellet formula feed is generally used in the culture of Penaeus vannamei. Because this kind of feed is sold at a high price (usually 4000 million yuan / ton), the feed cost is its main expenditure, which generally accounts for more than 70%. Therefore, it is reasonable to save feed and reduce the feed coefficient in culture.
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Symptoms and control of mycosis of cultured sea cucumbers
The period from April to August is the high incidence period of mycosis, both young ginseng and adult ginseng will get sick, but the disease did not occur in the seedling stage. At present, no cases of mass death of sea cucumbers caused by mycosis have been found. The typical appearance symptoms are edema of the ginseng body or decay of the skin. An individual with edema.
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