Effective measures to prevent floating head of fish
Discharge an appropriate amount of pond water and inject new water, and the suitable time for adding water is about 2-3 o'clock in the afternoon. Rational use of aerator, stop fertilization, control the eating of fish.
Sprinkle a small amount of quicklime water many times to regulate the pH of the water body. Chlorine dioxide was used twice to disinfect the water body, and an appropriate amount of oxygenator and microecological preparation could be applied before disinfection.
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Selection and conservation of carp species
Any good variety, if not pay attention to seed selection and seed conservation work, often will cause seed quality degradation, yield decline and other traits worse. Jian carp has stable genetic characters and can pass on the excellent dangerous state of this breed to the offspring through self-population breeding. However, different carp breeds are easy to mate and mix with each other, and there are differences among individuals of the same breed. Living environment will also have a greater impact on the traits of the breed. Therefore, we must pay attention to the breeding of improved varieties, according to the variety index, select the fish with good characteristics as parent fish breeding, and let them reproduce.
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How to raise shrimp well in midsummer
In the high temperature season in midsummer, hot weather, strong light, high water temperature and poor water quality affect the foraging and molting growth of shrimp, which can easily lead to disease and death of shrimp. Farmers should do a good job in the following management work in the high temperature season: with the increase of water temperature and the growth of shrimp, the water depth should be continuously increased, especially in the middle and later stages of culture, the water level must be increased to 1.8m~2m, and the high temperature period should be kept above 2.2m. During the high temperature period, full drainage and full irrigation should be carried out, and the water temperature should be controlled within 30 ℃, so that the transparency of the water can reach 35cm.
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