In general, aquaculture animals such as shrimp and crab during the seedling period have relatively low mortality due to weak resistance to various pathogenic microorganisms. In order to prevent diseases and reduce the hazards of aquatic animals at the seeding stage, timely disinfection of nursery sites and seedlings of aquatic animals is necessary. In the past, disinfectants used to disinfect breeding sites and seeds of aquatic animals were mainly lime, bleach, malachite green, and formalin. It is well known that these disinfectants have problems with large amounts (eg, quicklime), residuals (eg, trihalomethanes (THMs) after the action of chlorine agents), and high toxicity (eg, malachite green and formalin have a distorting effect). . Therefore, the use of chlorine preparations, malachite green, and formalin as pharmaceutical disinfectants has been considered untimely. In order to seek disinfectant for aquatic products with good disinfection effect, little toxicity, no residue and no pollution, we use the stable chlorine dioxide produced by Kangda Disinfectant Co., Ltd. of Xinxiang City, Henan Province (the main component is the stability of 6.6% Powdered chlorine dioxide) was tested as a disinfectant and a very good result was obtained. Here only the methods for the disinfection of stable chlorine dioxide shrimp, crab nursery sites and their seeds are described below.
I. Disinfection of Stabilized Chlorine Dioxide, Prawn Seedlings, and Reproduction Appliances Different disinfection methods are used depending on the target
1. For disinfection of dry ponds of broodstock and pro-crabs, the stable chlorine dioxide may be diluted with water to a one-tenth concentration aqueous solution, and the whole pool may be sprayed evenly. When disinfected with water, the stable chlorine dioxide can be diluted with a small amount of water (30 kilograms of water per 100 grams of drug) and diluted with water. The entire pool is sprayed evenly so that the drug concentration in the water reaches a concentration of 3 mg/l.
2. For reproductive devices, soaking and disinfection can be used. First, dilute the stabilized chlorine dioxide solution with water to a concentration of one-hundredth of a concentration of the aqueous solution, and then immerse the netware, fishing utensils, and other propagation tools in a stable solution of chlorine dioxide for 5 hours to 6 hours or more.
3. For disinfection of broodstock and pro-crab, you can dilute the stability of chlorine dioxide with a small amount of water, the whole pool evenly spilled, so that the concentration of the drug in the water to reach a concentration of 0.3 mg / l can be, or use a stable solution of chlorine dioxide Immersion method, that is, in a suitable sized container, containing a fixed amount of fresh water, diluting the stabilized chlorine dioxide therein so that the concentration of the drug in the body of water reaches 50 mg/L, directly immersing the broodstock and the crabs therein. 5 Minutes to 10 minutes.
Second, according to the specifications of shrimp, crab seed can be disinfected with different concentrations of stable aqueous solution of chlorine dioxide
1. Immerse the shrimp seedlings with stable chlorine dioxide solution and the crab seedlings to dilute the stable amount of chlorine dioxide in water. Prepare an aqueous solution with a drug concentration of 0.5 mg/L. Soak the shrimp and crab seedlings in it. 10 minutes.
2. Immerse the juvenile and juvenile crabs with a stable solution of chlorine dioxide to dilute the stable amount of chlorine dioxide in water. Prepare a solution with a drug concentration of 2.0 mg/L. Place the juvenile and juvenile crabs in the solution. Soak for 15 minutes to 20 minutes.
3. Periodically, a stable chlorine dioxide solution shall be splashed with a stable solution of chlorine dioxide in a pool of shrimps and crabs so that the concentration of the drug in the water of the rearing pond reaches 0.2 mg/L to 0.3 mg/L. Sprinkle once every 4 days to 5 days. As long as the stable use of chlorine dioxide is properly performed in accordance with the above method, it is possible to effectively prevent the damage of various infectious diseases that shrimp and crab seed may suffer during cultivation.
I. Disinfection of Stabilized Chlorine Dioxide, Prawn Seedlings, and Reproduction Appliances Different disinfection methods are used depending on the target
1. For disinfection of dry ponds of broodstock and pro-crabs, the stable chlorine dioxide may be diluted with water to a one-tenth concentration aqueous solution, and the whole pool may be sprayed evenly. When disinfected with water, the stable chlorine dioxide can be diluted with a small amount of water (30 kilograms of water per 100 grams of drug) and diluted with water. The entire pool is sprayed evenly so that the drug concentration in the water reaches a concentration of 3 mg/l.
2. For reproductive devices, soaking and disinfection can be used. First, dilute the stabilized chlorine dioxide solution with water to a concentration of one-hundredth of a concentration of the aqueous solution, and then immerse the netware, fishing utensils, and other propagation tools in a stable solution of chlorine dioxide for 5 hours to 6 hours or more.
3. For disinfection of broodstock and pro-crab, you can dilute the stability of chlorine dioxide with a small amount of water, the whole pool evenly spilled, so that the concentration of the drug in the water to reach a concentration of 0.3 mg / l can be, or use a stable solution of chlorine dioxide Immersion method, that is, in a suitable sized container, containing a fixed amount of fresh water, diluting the stabilized chlorine dioxide therein so that the concentration of the drug in the body of water reaches 50 mg/L, directly immersing the broodstock and the crabs therein. 5 Minutes to 10 minutes.
Second, according to the specifications of shrimp, crab seed can be disinfected with different concentrations of stable aqueous solution of chlorine dioxide
1. Immerse the shrimp seedlings with stable chlorine dioxide solution and the crab seedlings to dilute the stable amount of chlorine dioxide in water. Prepare an aqueous solution with a drug concentration of 0.5 mg/L. Soak the shrimp and crab seedlings in it. 10 minutes.
2. Immerse the juvenile and juvenile crabs with a stable solution of chlorine dioxide to dilute the stable amount of chlorine dioxide in water. Prepare a solution with a drug concentration of 2.0 mg/L. Place the juvenile and juvenile crabs in the solution. Soak for 15 minutes to 20 minutes.
3. Periodically, a stable chlorine dioxide solution shall be splashed with a stable solution of chlorine dioxide in a pool of shrimps and crabs so that the concentration of the drug in the water of the rearing pond reaches 0.2 mg/L to 0.3 mg/L. Sprinkle once every 4 days to 5 days. As long as the stable use of chlorine dioxide is properly performed in accordance with the above method, it is possible to effectively prevent the damage of various infectious diseases that shrimp and crab seed may suffer during cultivation.
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