A Full Analysis of Key Management Points for Pond Fish Farming in the Rainy Season

Recently, there has been a lot of heavy rain, thunderstorms and prolonged rainy weather, which can easily have a major impact on pond fish farming. To ensure stable and high yields in pond fish farming, the following points should be noted in pond fish management during the rainy season:

I. Fish Disease Prevention and Control

Regularly splash quicklime, chlorine dioxide or dibromohydantoin for disinfection, or use microecological preparations to improve water quality. Properly regulating water quality can prevent bacterial fish diseases and improve fish feeding and immune function. VC, immune enhancers, microecological preparations, etc. can be appropriately added to the feed to enhance the fish's constitution. Feed that is moldy, rotten or spoiled, as well as toxic substances, must be strictly prohibited from entering the pond. When applying medication, note that when the average water depth of the fish pond is less than 80 cm and the water temperature is above 30°C, the medication must not be splashed over the entire pond; when the water is relatively fertile and the temperature is relatively low, the dosage should be increased, and vice versa; splashing should generally be done in the afternoon or evening, and medication must not be applied at noon. In addition, when fish are gasping at the surface or have just stopped gasping, it is also not appropriate to splash medication over the entire pond; when applying medication in windy conditions, splash from the upwind side toward the downwind side; feed must not be given at the same time as splashing medication. Generally, medication is applied after feeding, but before feeding oral medication, feeding should be stopped for 1 to 2 days. Within 1 to 2 days after splashing medication, do not pull a seine net.

II. Water Quality Regulation

Fish are more prone to oxygen deficiency during the rainy season, so regulating water quality is especially important. The water is required to be sufficient in quantity, clean, free of pathogenic organisms and free of man-made pollution, and suitable for the production requirements of farmed fish. According to water quality conditions, discharge old water in a timely manner and add new water to increase dissolved oxygen in the water body and effectively improve water quality. If conditions permit, water can be added 4 to 5 times per month to increase the fish's activity space, improve water quality and promote fish growth. Turn on the aerator at the appropriate time, and the operating time can be appropriately extended. Adding new water can increase dissolved oxygen and nutrient salts and dilute organic matter and toxic substances in the pond water. Generally, add water once every 7 to 10 days, adding 15 to 20 cm of new water each time. Regularly splash quicklime water, generally about once every half month, with a dosage of 20 to 30 kg per mu per meter of water depth.

III. Feeding

The feed used for feeding must have good physical properties, including being fresh and palatable, nutritionally complete, and having good stability in water; the feed should be stored in a cool, dry, shaded place, and the produced feed should be used up within 30 to 60 days; feed that has been stored too long, has become damp, has been exposed to heat, is moldy or spoiled, or has been downgraded due to other factors must no longer be fed; feed should be given according to the principles of fixed time, fixed location, fixed quality and fixed quantity, while also flexibly adjusting the feeding amount according to actual conditions.

In addition, during rainy or heavy rain weather, oxygen deficiency and gasping at the surface in fish ponds increase, so pond inspection should be strengthened every day. Especially during thunderstorms or sultry weather, appropriately reduce the day's feeding amount. If fish are found gasping at the surface, stop feeding and fertilizing, promptly add new water and turn on the aerator to increase the oxygen content in the water, regulate water quality, and avoid the occurrence of pond turnover and fish deaths.

Lu Jiashi