Prediction and forecast of aquaculture diseases in Hebei Province in April 2021
By: Date: 2021-03-25 Categories: foodtechnology Tags: ,
  In April,HebeiThe provincial air temperature and water temperature began to rise, but the water temperature was still low. After overwintering, aquatic animals are weak in physique and are easily attacked by diseased organisms, so feeding and management should be strengthened. According to the monitoring data of the province’s aquaculture disease monitoring and reporting in the same period in recent yearsHebei, the following aquatic animal diseases need to be focused on in April.

  1. Illness prediction

   (1) Infectious hematopoietic necrosis:The pathogen is infectious hematopoietic necrosis virus, which mainly harms rainbow trout, especially juveniles within 3 months of age. The water temperature of the disease is 8℃~15℃, and the circulation of virus-carrying seedlings is the main reason for the rapid spread of the disease. Focus on the main rainbow trout breeding areas of Taihang Mountain and Yanshan Mountain in Hebei Province.

   (2) Carp edema disease:the pathogen is carp edema virus, which mainly harms carp and koi. The water temperature of the disease is 7℃~30℃, especially at 22℃~28 ℃ is prone to disease. Symptoms are similar to those of Koi herpes virus disease. Focus on the inland areas of Hebei Province.

  (3) Saprolegniasis:The main harm species are carp, grass, silver carp, bighead and other freshwater fish. 10~15℃ is more suitable for the breeding of water mold. After overwintering, the fish will lose their physical fitness and loose scales. The fish may be injured and infected with water mold due to the transfer of ponds, pools or parasites. Focus on the inland areas of Hebei Province.

   In addition, we also need to pay attention to freshwater fish red skin disease, marine fish enteritis disease, soft-shelled turtle red neck disease, soft-shelled turtle red floor disease, etc.

   2. Prevention measures

   (1) Preventive measures

  1. The fish body is relatively weak after overwintering, so the water level should be kept as high as possible, and the water quality should be adjusted or new water should be added to maintain good water quality and dissolved oxygen demand. . Add or change water in small amounts and multiple times. Avoid large-scale irrigation. Chlorine or iodine preparations should be used to prevent and disinfect the breeding ponds, water inlet and drainage pipes, and production tools regularly to reduce the pathogen density in the water body and avoid cross-infection.

  2. Before stocking, disinfect the pond, tools and seedlings to prevent the seedlings from introducing pathogenic microorganisms; the imported seedlings should be quarantined to control the pathogens from the source; keep Reasonable breeding density; when pulling the net to transport and stock fish, operate carefully, try to avoid fish body injury, and reduce stress stimulation.

  3. To improve the quality of feed, immune enhancers can be added to the feed regularly to improve the disease resistance of fish.

  (2) Treatment measures

  1. For rainbow trout infectious hematopoietic organ necrosis, the diseased pond and adjacent ponds should be isolated and reared, the dead fish should be treated harmlessly, and the breeding tail water should be disinfected It can be discharged after treatment. The breeding tools are dedicated and disinfected in time. Turn on the aerator to increase oxygen, suspend or reduce the feeding of feed, maintain high dissolved oxygen in the water body, and do not abuse drugs or fall into the pond when the fish is sick to reduce stress; can be in the feed Adding rhubarb and other antiviral Chinese medicines for treatment; raising the water temperature to 16 ℃ ~ 20 ℃ is also one of the effective methods. Report the illness to the superior department in a timely manner.

  2. For carp edema disease, the diseased pond and adjacent ponds should be isolated and reared, dead fish should be treated harmlessly, and breeding equipment should be dedicated and disinfected. The tail water can be discharged after disinfection treatment to limit the movement and transportation of diseased fish in the diseased farm; for the ponds that are diseased, stop changing the water, start the oxygenation, maintain sufficient dissolved oxygen, reduce stress stimulation, and stop feeding the bait; Stop the medication at the initial stage, and sprinkle antiviral Chinese medicine such as Sanhuang powder on the whole pond 4 to 5 days after the onset of illness, with a dose of 10 g/cubic body of water. Report the illness to the superior department in time.

  3. For water mold disease, avoiding fish body injury is the key to prevention and treatment. The feed can be reduced by half, and Vc and immune polysaccharides are added to the feed to improve Fish body immunity, and soak in 3%to 5%salt water for 5 to 10 minutes and other methods for treatment. At the same time, use chlorine preparations to disinfect the water at intervals.

  4. For other related aquatic animal disease prevention and control methods, please refer to”www.adds.org.cn (aquatic animal disease remote auxiliary diagnosis service network)”.