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First, external agents, generally choose bleach, chlorinated sea or diterpene, zinc sulfate, carapace, etc. can be. l. Bleaching powder: bleaching powder has the lowest effective chlorine in all chlorine preparations. Prior to maturation, the use of high-chlorinated preparations such as strong chlorinated chlorine (about 90% of available chlorine) will cause irritation to crab tissues and cause adverse reactions, leading to premature hole-opening or escape, and even death. Recovery rate. 2. Bromochlorohydantoin (or dichlorohydantoin): Hydantoin disinfectant can maintain the balance of available chlorine in the water body, maintain the sterilizing state of the water body for a long time, its bactericidal power is strong, the spectrum is high-efficient, and the efficacy is not affected by the water body environment. , And the irritating to the crab, so it can effectively control the pathogens of crabs in the late growth stage, so that the river crab is safe and mature. 3. Zinc sulphate: Zinc sulfate crystal common name 皓矾. There is a strong ability to kill pathogens and astringency. It can effectively kill the protozoans such as worms and polychaetes. Zinc sulphate contains various mineral elements such as iron, copper, boron and magnesium. These mineral elements can effectively regulate the intracellular and extracellular osmotic pressure of crabs in water bodies. Because the crab matures, the osmotic pressure in the precursor cells increases. Frequently in a freshwater environment with low DPT, it is easy to die. The use of zinc sulphate prior to the marketing of crabs can make the surface of the crab clear. At the same time maintaining osmotic pressure, thereby increasing the commodity rate and the rate of withdrawal. 4. Carapace Net: For some body hairy crabs. The use of carapace nets before net fishing for shellfish or temporary conservation can effectively remove surface litter.
Second, the oral administration of drugs, the general choice of furazolidone, norfloxacin, calcium hydrogen phosphate, auxin, multivitamins and so on. 1. Furling: Before crabs are eaten, they eat a lot of high-protein animal foods, which are easy to cause indigestion. Causes gastroenteritis, so you need to take furazolidone regularly. 2. Norfloxacin: It has the advantages of wide antibacterial spectrum, strong antibacterial activity, and killing effect on bacteria. For the prevention and treatment of late seedling disease effect. Such as the prevention of carapace ulcer disease effect. 3. Auxin: Auxin enriches the sterols necessary for the extraction of ecdysone and synthetic hormones from wild plants to prevent crab shell clam shell disease. Therefore, it is necessary to take auxin at this time in order to improve the ability of oyster shells. 4. Calcium Hydrogen Phosphate: The internal use of calcium hydrogen phosphate can effectively supplement calcium and phosphorus. When calcium and phosphorus are deficient, the growth of crabs is slowed down, thereby affecting the rate of weight gain before crab maturity. 5. Multivitamin: It is rich in various vitamins and biological active substances necessary for growth of crabs, which can effectively promote the growth of crabs. To avoid the occurrence of nutritional deficiencies, the lack of vitamins can cause the crabs to lose appetite, prolong the crust cycle, and the crust can not be calcified.
Third, banned agents, such as malachite green, copper sulfate and other heavy metal salts. The late use of copper citrate can easily lead to severed limbs, and it also hinders the action of intestinal trypsin and amylase affecting the feeding and growth of aquatic animals. Malachite green has a carcinogenic effect and later use affects the quality of crabs and cannot be used as an export commodity. Impedes the action of intestinal enzymes and affects the feeding and growth of aquatic animals.
Drug selection before listing
Before the crabs are listed on the market, the selection of pesticides should be done properly. Otherwise, the catch rate and commodity rate of crabs will be affected, which will seriously affect the breeding efficiency.
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