As mentioned above, the risk of various aquatic diseases decreases in winter compared to summer.
However, this does not mean that the disease can be completely ignored.
To this end, this paper especially sorted out the December prone aquatic diseases and corresponding prevention and control measures for reference.
I. Overview of disease prediction
In December, it is important to focus on and prevent diseases such as water mildew, erythroderma and vertical scale. For details, please refer to the following chart:
2. Prevention and control measures
Strengthen wintering management:
In winter, the temperature difference between day and night is large, and the aquaculture aquatic animals are easy to produce stress reaction, so the aquaculture water level should be properly deepened to reduce the temperature difference of water.
The varieties that need to overwinter should be prepared in advance for the insulation shed or warming equipment, and the cultured varieties should be transferred to the overwinter pond in time, and the work of heat preservation, oxygen enhancement, water quality control and feeding should be done.
Daily management:
Regularly inspect the mouth of the pond, monitor the water quality index, and keep the water quality up to standard.
After catching the dry pond, the pond should be strengthened and desilted in time, and the whole pond environment should be regulated.
Use the pond idle period for effective exposure to sunlight, and thoroughly clean the pond disinfection, can use quick lime all the pond liquor, the specific operation: dry pond 75 kg/mu, with water 150 kg/mu.
Avoid mechanical damage:
In the operation process of fishing, transportation and stocking, try to avoid fish body injury, and timely disinfection after pulling the net.
Optimize the breeding environment:
Water quality can be regulated by sprinkling microbial preparations and substrate improver to maintain excellent water phase.
Multidimensional and immune enhancers were added to feed to enhance nutrition and improve the disease resistance of cultured varieties.
Medication:
Water mildew: In the early stage of the disease, you can choose povidone iodine and other iodine disinfectant bath, or use 8mg/L salt and baking soda mixture (1:1) to splash the whole pool of wine; At the same time, take antibacterial drugs (such as sulfonamides, etc.) internally to prevent bacterial infection.
Red skin disease: It can be treated with Chinese herbs such as Shuanghuang Kushen powder, Shanqing Wuhuang Powder, Genlian Jiedu powder, Jiaxiaohuang powder and Qinglian Baiguan powder. Treatment with sulfonamides, mixed bait and feed aquaculture antibiotics.
Vertical scale disease: can choose green plate Huangbai powder and other Chinese herbs, sulfonamides for treatment, mixed bait feed aquaculture antibacterial drugs.
Others:
Before using drugs in winter, you need to look at the weather forecast in advance, if the recent weather changes, it is best not to use drugs. Generally, the efficacy of the low-temperature pond is less affected by various microorganisms, the efficacy lasts longer, and the dosage is relatively reduced when the drug is used compared to the summer.