Disease Prevention and Control of Swimming Crabs Launched

During the incubation period of the crab, due to various reasons, the larvae are often affected by disease and affect the survival rate. How to prevent the larvae from getting infected and find that the larvae have taken measures to rescue the disease after the invasion of the larvae is a crucial part of the cultivation work of the crabs. Comprehensive prevention and control techniques for disease during the cultivation of the crab, for reference.

First, choose a good crab, pay attention to pro-crab disinfection First, choose a healthy, disease-free, large amount of pro-crabs, each pro crab weight 180 grams or more, pro-crabs must be immersed in the sterilized 30 ~ 40 minutes to kill the polypworm on the crab body. During the cultivation of crabs, they often check to see if there is any disease invasion, and if problems are found, promptly take effective measures to kill them. At the same time, antibiotics are regularly used to sterilize pro-crab ponds to prevent disease. Before raising the seedlings, catch the crabs, wash the sludge, and then immerse them in a solution of benzalkonium chloride for 30-45 minutes.

Second, adjust the water quality, the use of fresh water breeding seedlings need to accept the tide water, and then after the second precipitation, can be used. After the water is contained, the sedimentation tank is treated with quicklime to disinfect the plankton and pathogenic bacteria. If the salinity is not suitable, the salinity adjustment in the distribution pool is required. The salinity is adjusted to 26 to 28 inches. When the water enters the nursery pond, it is strictly filtered with a dense sieve to prevent entry of bacteria into the pond. The breeding pond water must also be treated with edta sodium salt to complex heavy metal ions in the water. During the nursery, depending on the water quality and the different stages of the larvae, pay attention to changing the water, change 20-30% in the early stage and 100-150% in the later stage to keep the water fresh.

Third, the nursery ponds, tools, etc. for thorough disinfection seedlings, the reservoir, nursery ponds, feed pools and other strict cleaning, the dirt, sludge and other clean and rinse with water, then use 100ppm bleaching ***, 100ppm formaldehyde Disinfect them one by one to kill pathogens in the crevices on the pool walls. In addition, the tools and supplies used, such as crab cages, cages, buckets, pumps, etc., are often strictly washed and disinfected with 100 ppm potassium permanganate or 100 ppm bleached *** to prevent bacteria from entering the pool.

Fourth, the use of a reasonable seedling density Density is too large, larvae nutrition is difficult to ensure, vulnerable to weak seedlings, in addition, the water quality is also difficult to control, larvae are vulnerable to disease. Therefore, we should pay attention to the use of a reasonable seedling density, the general density of seedlings can be flexible according to the supply conditions of the bait, changing the water and so on, in general, should not exceed 100,000 / cubic meter.

Fifth, to ensure the quality of food, reasonable feeding

1. Use multiple live baits: The use of a suitable amount of live bait feeding can reduce the pollution of the pool water, keep the pool water fresh, and can ensure the nutritional supply of larvae, improve the larvae immunity and reduce the incidence of disease.

Live baits mainly include: single-cell algae, rotifers, Artemia, etc. They are supplied on time and in sufficient quantities according to the needs of each period.

2. Pay attention to the disinfection of the bait: First of all, sometimes the rotifers and Artemia that are cultivated by oneself are not enough, and it is necessary to purchase the growth of the natural world. After the shipment, potassium permanganate and formaldehyde should be disinfected and sterilized.

Second, it needs to be fed with substitute bait, which can be sterilized by high-temperature, potassium permanganate soaking before use.

In addition, Artemia eggs are soaked with 150-200 ppm bleaching solution for 15-20 minutes before hatching.

3. Adhere to a small number of principles of feeding: In the specific feeding, we should adhere to the principle of a small number of times, depending on the different stages of the larvae, the number of the number of reasonable feeding, prevent hunger meal full meal.

Six, to strengthen drug prevention During the nursery, the regular Quanchiposa drugs can play a role in sterilization, antibacterial, prevent disease.

The main use is to use oxytetracycline 1 to 2 ppm or dibromohydantoin 0.3 ppm regularly, and use potassium permanganate 0.5 to 1.0 ppm to prevent polyposis later. It is generally possible to use a single drug to prevent disease every time you clamshell. Do not abuse it.

VII. Use of Microbial Preparations Microbial preparations can degrade organic substances in water, inhibit the growth of harmful microorganisms and pathogens, maintain good water quality, and reduce the incidence of larval diseases. Therefore, they should be used during the seedling raising process. The commonly used microbial preparations mainly include: photosynthetic bacteria, Bacillus, and nitrobacteria. During the use of microbial preparations, bactericidal drugs should be used with caution in order to avoid killing microbial preparations and not achieve the desired effect.

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