Freshwater lobster is a kind of economical freshwater prawn, which has six major characteristics: First, large and fat; Second, fast growth, high yield; Third, nutrient-rich, tender meat; Fourth, adaptability, in bad weather, Survival in the environment; Fifth, eating habits, can eat animal feed, but also eat artificial feed and humus; six is ​​high economic efficiency. Breeding technology Pond ponds for freshwater lobster culture should be selected where they are well ventilated, have a quiet environment, are convenient for drainage and irrigation, and have no pollution. 1 The pond should be rectangular, with an area of ​​1334 to 3335 per square meter, with a water depth of 0.9 to 1.5 meters. 2 The bottom of the pool is hard earth or sandy, without silt, and the pool wall must have a certain slope. 3 The pond should have a good drainage and irrigation system. The upper part of the pond should be filled with water, one end should be drained at the bottom, and the water inlet and outlet must be protected from enemy fire and escape from the net. 4 There should be a suitable area of ​​submerged plant area at the bottom of the pond, and there are enough artificial concealed objects, such as waste tires, meshes, bamboo rafts, etc., to provide shelter for lobsters. 5 Conditional ponds can be equipped with aerators. 6 Before stocking the shrimp, it is necessary to disinfect the pond. If it is a newly-built shrimp pond, the quick-lime can be used to clean the pond. If the old fish pond is cultured, it must be disinfected by dry ponds. In addition to splashing lime, it is also necessary to completely remove the ponds and cockroaches in the pond. Black fish and predatory predators such as snakes and rats. The water quality requirements mainly use uncontaminated surface waters such as rivers, rivers, lakes, and reservoirs as water sources. Groundwater can also be used as a source of water. Freshwater lobsters have strong adaptability. The pH of the water can survive in the range of 6.10 to 9.33, but it is appropriate to use 6.5 to 9.0, and it is better to use neutral alkali to facilitate the rapid growth of lobsters. Although freshwater lobsters are resistant to hypoxia, long-term exposure to low dissolved oxygen will affect their growth rate and survival rate. Water quality should also be prevented from being contaminated by heavy metals, insecticides, herbicides, oil, methane, etc. Micro-fluidic water or aquaculture should be added to aquaculture to promote growth. Shrimp release and daily management The shrimp seedlings should be placed in the early morning or evening on a sunny day before being put into use. Before putting it on, use a small amount of water to slowly put the seedlings into the container and adjust the water temperature until the water temperature in the container approaches the pool water temperature. The stocking densities range from 7.5 to 9.0 per square meter. The specifications of shrimps stocked in the same pond need to be neat and consistent. Daily management Due to the fast growth of freshwater lobsters, strong metabolism, and high oxygen consumption, shrimp pond water quality should always be kept fresh. Generally, 15 to 20 centimeters of water is added every week to make the water quality live and there is enough dissolved oxygen. The bait feed should be fixed, timed, and quantified. The types should be as diversified as possible. Each day should be fed once in the morning and at night. The bait should be placed on the shallow side of the pond.
Human chorionic gonadotropin is a hormone for the maternal recognition of pregnancy produced by trophoblast cells
Human chorionic gonadotropin (HCG) is a glycoprotein secreted by trophoblast cells of the placenta And β dimer proteins. The molecular weight of glycoprotein hormone 36700, A. Pituitary, FSH, follicle stimulating hormone, LH (luteinizing hormone) and TSH (thyroid stimulating hormone) are basically similar, So they can cross-react with each other, while the structure of β subunit is not similar. In mature women, the fertilized ova move to the uterine cavity for implantation and form embryos. In the process of development and growth into the fetus, the placental syncytiotrophoblast cells produce a large amount of HCG, which can be excreted into urine through the blood circulation of pregnant women. Serum and urine HCG levels rise Rapidly from 1 to 2.5 weeks of gestation, reaching a peak at 8 weeks of gestation and dropping to moderate levels at 4 months of gestation, which remain at the end of gestation. At present, the commonly used detection methods are: latex aggregation inhibition test and hemagglutination inhibition test; Radioimmunoassay (RIA); Enzyme linked immunosorbent assay (ELISA); Monoclonal antibody colloidal gold test
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