After the cold wave, local governments still need to prevent "cold springs."

In April, national aquaculture began to enter the production period. As the weather gradually warms, the southern region begins to enter the breeding period of aquatic species; in the northern region, with the end of the ice-sealing period, it gradually enters the aquaculture production period from the end of winter, and the aquatic animals are relatively prone to viral diseases due to their relatively weak constitution. Fungal diseases and so on. During the “Qingming” solar season, localities must pay attention to the impact of increased rainwater on aquaculture; the “cold rain” has basically ended the cold wave after the end of the year, and local governments still need to guard against the “cold spring” phenomenon.

Disease prediction

1. Spring haemorrhagic disease: The main target is salmon, koi, goldfish, etc. The onset water temperature is 8°C-20°C, especially in 15°C-17°C. Focus on the "Three North" region and Chongqing, Henan, Shandong, Jiangsu, Anhui, Jiangxi eel main area.

2. Grass carp hemorrhage: The main target is grass carp fingerlings and 1 foot old herring. The onset water temperature is 20°C to 30°C. When the water temperature is higher than 20 °C popular, 25 °C -28 °C as a popular peak. Focus on the Yangtze River basin and grass carp and bluefish main areas south of the Yangtze River.

3. Infectious hematopoietic organ necrosis: The main target is rainbow trout. The onset water temperature is 8°C-15°C. The smaller the fish age, the more sensitive the disease is. The focus areas are concentrated aquaculture areas such as Hebei, Liaoning and Gansu.

4. White Spot Syndrome: The main subjects of interest are white shrimp, prawns, and juvenile prawn, focusing on the coastal aquaculture areas of Fujian, Guangdong, and Hainan.

5. Macrobrachium rosenbergii white tail disease: easy to occur in the breeding stage of Macrobrachium rosenbergii, focusing on the Fujian and Guangdong shrimp breeding area.

6. Scrub mycorrhizal disease: There is no selectivity to the host, various freshwater fish, migratory fish, and ornamental fish can be parasitized. The suitable water temperature for breeding is 15°C-25°C, focusing on Beijing, Chongqing, Henan and Jiangxi. , Fujian, Guangxi, small water bodies, high density farming areas.

7. The ringworm disease: the main hazards of earthworms, cockroaches, grass carp, earthworms, cockroaches, etc., focus on areas such as Zhejiang, Jiangxi, Fujian, Hubei, Guangdong, Guangxi and so on.

8. The third generation of worms: The optimum temperature for the reproduction of the third generation of worms is about 20°C. The disease is easily obtained in brackish water ponds and indoor wintering ponds, focusing on the region of Henan.

In addition, watery mildew is also a disease that occurs frequently in April. Especially in areas north of the Yangtze River, the water quality of the pond after winter is thinner, and the transparency is higher, which is suitable for the reproduction and growth of water mold.

Control measures

1. Strengthen seed quarantine. Strengthen the quarantine of the aquatic product seedlings, ensure the control of the source, and eliminate the introduction of pathogens that carry pathogens. In order to ensure the quality of seedlings, on the one hand, attention should be paid to not introducing pathogens that carry pathogens. On the other hand, if the seedlings for production or for sale continue to remain after wintering, they should be sent to the inspection department for quarantine.

2. Do a good job of scientific disinfection. Disinfect ponds as much as possible to remove the pathogenic microorganisms in the pond's silt; disinfect the seedlings to prevent the seedlings from carrying pathogenic microorganisms; and disinfect the live food to prevent its transmission.

3. Avoid fish injuries. When spring seedlings are put in and transferred to ponds, the fish body should be avoided as far as possible to avoid pathogen infection and cause diseases.

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