The fish and polyculture can make full use of the pond water space, exert the comprehensive advantages of the pond, and improve the economic benefits of breeding. It is a good breeding mode. In the fall, although the temperature has decreased, but the morning and evening temperatures change greatly. At this time, the management of ponds should be strengthened. According to the changes in water quality, corresponding measures should be taken to stabilize the annual farming results and ensure the high yield and efficiency of breeding. Summarize the management points of several pond polyculture ponds in the autumn for the reference of the various department model households:
First, strengthen water quality regulation
After the fall, the temperature difference between morning and evening changes greatly, and it is easy to cause hypoxia in the pond, resulting in flooding ponds. In the case of polyculture ponds in the fall season, water quality should be regulated to keep the water quality fertile, tender, live, and cool, with a transparency of 30-35 cm, a pH of 7.5-8.5, and dissolved oxygen of 4-5 mg/L.
During the aquaculture process, according to the water level of the pond, the quality of the water, and the growth of the fish gills in combination with weather changes, new water and water should be added at a proper time. Each time new water is added, it is 10-15cm, and each time the water is changed is about 1/3 of the water.
Because of the large amount of calcium required for earthworms during their growth and development, quicklime must be applied to the pond regularly to meet the growth needs of earthworms and improve water quality. In the fall, lime is applied once every 20 days for a dose of 15 kg/mu.
Second, scientific and reasonable feeding
In the process of polyculture, the cockroach is the key to feeding, and it can feed artificial compound feed with a protein content of more than 40%, and implement the “four-fixed†feeding principle of “timing, fixed-point, qualitative, quantitativeâ€. Feeding amount should be controlled flexibly according to the size and water temperature of the earthworm and the feeding situation. The daily feeding amount is 3-4% of the total weight of the earthworm. The feed should be fed once a day every evening and the corn, soybeans and other plants should be appropriately increased every 3 days. Feeding of food. After the food was fed for 2 hours, the food table was inspected in time, and the amount of food left on the food table was adjusted in time. When the water temperature drops to 16°C no feed is given.
Third, do a good job of disease prevention
Autumn is a period of high incidence of aquaculture diseases. It must be prevented and combined. In the high season of disease, it is necessary to diligently disinfect the culture tools. Disinfect the food table with bleaching powder once every two months and sprinkling with bleaching powder or quicklime once every 20 days to disinfect, sterilize and adjust the water quality of the pond.
Take ecological preventive measures, alternately use nitrifying bacteria, EM bacteria, photosynthetic bacteria and other micro-ecological preparations and sediment modifiers, degrade the ammonia nitrogen, nitrite and other harmful substances in the water, purify the pond water quality, kill or inhibit the pathogenic microorganisms, Reduce the incidence of disease.
Regularly adding proper amounts of aquatic products, such as multi-dimensional, immune polysaccharides to improve the disease resistance of fish gills and reduce the occurrence of diseases. During the aquaculture process, weeds are removed in time to keep the pond’s water environment and surrounding environment clean and sanitary.
Fourth, strengthen the patrol pond management
In the fall, it is necessary to step up the patrol pond and adhere to the morning, mid-night and evening patrol ponds. When observing the patrol pond, observe the fish's feeding, activities and pond water quality, remove the residual baits in time, and clean the food table. In the juvenile breeding stage, rats, snakes, and other predator organisms should be eradicated in time to reduce the damage to juveniles. Pay attention to check whether there are loopholes in the anti-escape facilities and pools, find loopholes, and deal with them in time to prevent them from escaping. At night, it is necessary to strengthen anti-escape and anti-theft inspections.
V. Precautions
Overcast and rainy days, precautions should be taken to prevent fish from floating. Oxygen can be used for oxygenation. Polyculture of fish gizzards should pay special attention to the concentration of drugs used, balance the needs of fish gill disease control, select appropriate drugs, and rational use of drugs.
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