Although the temperature has dropped slightly in autumn, the water temperature in breeding ponds is still high. In this case, according to the characteristics of large temperature difference between the upper and lower parts of the pond water body, rapid changes in water quality, etc., flexible measures are taken to stabilize the annual aquaculture production and ensure the yield and benefit of aquaculture.

I. Strengthen water quality regulation

As the amount of fish on ponds gradually increases, the organic metabolites of fish, shrimp, crabs and crabs increase accordingly, and water quality deteriorates due to lack of timely decomposition. Therefore, observation and monitoring of pond water quality should be strengthened and water quality should be adjusted timely. Specific methods: 1 Inject new water to increase the total volume of pond water. 2 Adjust water quality with quicklime, microbial preparations, etc. in a timely manner. The pond water color is yellow-green and yellow-brown; the transparency is about 30cm; the water quality meets the fishery water quality standards.

Second, rational fertilization, increase investment concentrates, fertility and promote strong

In autumn, the content of organic matter in ponds is usually high, and fertilization is generally dominated by inorganic fertilizers. Inorganic fertilizers are dominated by phosphate fertilizers and supplemented by nitrogen fertilizers. In autumn, the growth of aquaculture objects is relatively slow. At this time, the increase of feed for the concentrate feed not only increases the yield, but also effectively improves the specifications of the aquatic products and the breeding efficiency.

Third, timely increase oxygen

Large temperature difference between morning and evening after the fall, easily lead to lack of oxygen floating head, or even pan. In order to effectively increase dissolved oxygen in the water and reduce the content of toxic and harmful substances such as ammonia nitrogen and nitrite in the water body, an aerator can be generally opened at 1 to 2 o'clock in the middle of the night, and shut down after 7 to 8 o'clock in the next morning. The principle of opening two is not open.

Fourth, reasonably control the amount of pond grass

Excessive amounts of ponds and grasses are likely to cause insufficient illumination at the bottom and cause severe oxygen deprivation, resulting in the death and decay of aquatic grasses and benthic organisms, thereby damaging the water quality. Therefore, the density of aquatic weeds should be reasonably controlled so that gaps of 3 to 4 meters are left between plants. Shrimp crab pond water control coverage of 40%.

Fifth, combining internal and external, scientific disease prevention

The main diseases in autumn are ectoparasites and bacterial diseases. It is advisable that Prussian 1-2 times insecticides and bactericides, or microbial agents and sediment modifiers, fully degrade ammonia-nitrogen, nitrite and other toxic and hazardous substances and reduce the occurrence of disease.

Sixth, timely listing of fish

The density of ponds is too high and the amount of fish is high. Batch fishing, overall sales. Fishing is selected in the morning; after the net is pulled, avermectin, chlorine dioxide, bromochlorogenic acid and the like are used for disinfection.

Seventh, strengthen the patrol pond and make records

Adhere to the early, middle, and evening patrols, and make records. Weeds, dead grass, dead fish, dead shrimp, and dead crabs are often removed. Always check anti-escape facilities to prevent shrimps and crabs from escaping.

Veterinary Medical Equipment

Veterinary Medical Equipment

Veterinary Medical Equipment

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