Artificial culture method of Procambarus clarkii

Prevention and treatment of common shrimp disease shrimp septicemia caused by Aeromonas aeruginosa, the disease comes ferociously, the incidence is high. The body surface of the diseased shrimp is covered with bleeding spots of different sizes, especially the appendages and abdomen, and the anus is red and swollen. Once the crayfish is infected with bleeding disease, it will die soon. Prevention and treatment: if ① found sick shrimp, timely isolation, and pond water disinfection, every 6677m2 water depth 1 meter with quicklime 25kg ~ 30kg chemical water whole pool sprinkle; ② every 667m2 take 750g tobacco leaves soaked in warm water for 5 ~ 8 hours and then sprinkled in the whole pool, at the same time, ciprofloxacin hydrochloride raw material 1.25g ~ 1.5g was added to every kilogram feed for 5 days.

Water mildew is caused by water mold. The initial symptoms of the disease are not obvious, when the symptoms are obvious, the hyphae have invaded the shrimp epidermis and produced cotton-like hyphae, forming "white hairs" visible to the naked eye. Diseased shrimp emaciated, restless, decreased food intake, serious cases lead to death. Prevention and control: ① should operate carefully in the process of fishing, transportation and stocking to avoid shrimp damage; ② uses 1%-2% salt water to bathe diseased shrimp for a long time, and the effect is better; ③ is sprinkled with salt and baking soda each 400g in each cubic meter of water.

Gill rot disease is caused by bacteria, the Gill filaments of diseased shrimp are black and locally mildew. Prevention and treatment: ① often removes residual bait and dirt from shrimp ponds to keep the breeding environment clean; ② is sprinkled with 2 grams of bleach per cubic meter of water in the whole pond.

Smut is caused by serious water pollution and Gill filament contaminated by mold. The gills of diseased shrimps change from red to brown or light brown until they turn black completely, causing Gill atrophy. Sick shrimps often lie motionless on the shore and eventually die of difficulty breathing. Prevention and control: ① keeps the aquaculture water clean and has sufficient dissolved oxygen; ② soaks the diseased shrimp with 3% 5% salt water for 2 ~ 3 times, each time for 3 ~ 5 minutes; ③ is sprinkled with 10 grams of methylene blue in the whole pool per cubic meter of water.

Rotten tail disease is caused by shrimp injury, cannibalism or infection by chitin-decomposing bacteria. In the early stage, there are blisters in the tail of the diseased shrimp, resulting in festering, necrotic or incomplete at the edge of the tail. With the deterioration of the disease, the ulceration of the tail develops from the edge to the middle, and the whole tail of the diseased shrimp is swallowed up when it is seriously infected. Prevention and treatment: when ① seedlings are transported and released, do not pile up and damage shrimp; ② feeding should be adequate and uniform to prevent shrimp from killing each other due to lack of bait; ③ should be sprinkled with 15 ~ 20 grams of tea meal soaking solution per cubic meter of water.

Polycondensation disease is caused by the parasite parasitic on shrimp carapace. There were more dirt on the body surface of diseased shrimp, and the ability of feeding and activity gradually weakened, and the serious ones died before dawn. Both larvae and adult shrimp can occur, which do serious harm to young shrimp. Prevention and treatment: ① thoroughly disinfects and kills the pathogen; ② can often change a large amount of water and reduce condensation.

The number of worms could reduce the harm to crayfish, and ③ was immersed in a mixture of bromogeramine and potassium permanganate at the concentration of 0.5mg / L and 5mg / L.

The most common pathogens of ciliosis are cumulus and acicular worms. Ciliates are attached to the body surface, appendages and gills of adult shrimp and shrimp seedlings. When attached in large quantities, it will hinder the function of respiration, swimming, activity, feeding and molting of shrimp, and affect the growth and development of shrimp. Especially when a large number of gills are attached, it will affect the gas exchange of Gill filaments, and even cause anoxia and suffocation of shrimp. The larvae are covered with a layer of white floc during the disease, which weakens the activity of the larvae and affects the development and metamorphosis of the larvae. Prevention and cure: ① keep reasonable density, pay attention to environmental sanitation of shrimp ponds, change water frequently, keep water fresh; ② soak diseased shrimp with 25 g ~ 30 g formalin solution per cubic meter of water for 4 ~ 6 hours, continuous 2 ~ 3 times, the effect is better.