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First, to strengthen the feeding of feed
In July, fish, shrimps, and crabs were in an ingestion period and grew rapidly. We must seize the opportunity to increase the feed intake and promote the rapid growth of farmed animals. The number and frequency of specific feedings per day depends on the speed of feeding, shrimp, crabs, weather, water temperature, and water quality. From the point of view of food intake, the average fish is within 0.5 to 1 hour, shrimp and crab are suitable for eating within 1 to 2 hours, and the feeding time of green feed can be appropriately extended. The number of feedings per day should be 2 times, 1 in the afternoon and 1 in the afternoon. When the weather is fine and the dissolved oxygen in the water is high, feed more; when the weather is hot or raining, and when the water quality deteriorates, the oxygen content of the water drops, the appetite of fish, shrimp and crabs decreases, and the feeding rate slows down. Stop eating. The feed fish fed in shrimp and crab breeding should be kept fresh to prevent visceral diseases and pollute the water quality.
Second, a reasonable fertilization to farm fish, oysters, tilapia and other fertilized fish-based ponds, to maintain a certain degree of fat. In July hot season, we should pay attention to reasonable fertilization. We must constantly supplement fertilizers to maintain the fertility, but also to prevent excessive fertilization, resulting in deterioration of water quality. The specific amount of fertilization should be based on transparency, weather, water color, and water quality. The transparency is too large, the water color is light, and the amount of plankton is small, which is detrimental to the growth of the fish; the transparency is too small, the water color is too thick, and it is prone to lack of oxygen. The transparency is preferably 25 to 30 cm; the water color is yellowish green, greenish brown and dark brown. If the weather is clear, fertilization may be appropriately increased. Otherwise, fertilization should be stopped. Specific fertilization should be carried out in accordance with the principle of “few timesâ€. The types of fertilizer are divided into organic fertilizers and inorganic fertilizers. Organic fertilizers have long performance, but they consume a lot of oxygen when they are decomposed. When the water temperature is low, some organic fertilizers may be added. When the water temperature is high, in order to prevent the increase of oxygen consumption, some inorganic fertilizers may be added. Generally, 5 to 7 days are used once.
Third, strengthen water quality management
In July, the water temperature is high, the weather changes rapidly, feed is fed more, and the water quality is not easy to control. Therefore, we must pay great attention to changes in water quality, prevent the occurrence of anoxic floating heads, and even the occurrence of dead fish accidents. To constantly raise new water, constantly raise the water level, shrimp and crab ponds to raise the water level to more than 1.5 meters, high-yield fish pond water level should be deepened to more than 2 meters. The old water in the pool should be replaced regularly and new water should be replenished timely. Generally 5 to 7 days for a water, first row after the increase, a change of 10 to 15 cm. When the water quality deteriorates, it is necessary to increase the amount of water to be changed, and one-fourth to one-third of the water can be changed at a time Timely removal of residual feed and other contaminants from fish, shrimp, and crab in ponds will prevent deterioration of water quality. Every day depends on the weather, water quality and other conditions in a timely manner to increase the oxygen aerator, if you encounter showers or hot weather, you should extend the boot oxygen time. At the same time, the lime concentration of 2010-6 concentration may be applied once every 15 to 20 days. Where conditions permit, promote the use of beneficial microbial preparations to improve water quality. Especially in shrimp and crab ponds, it is best to apply photosynthetic bacteria or EM bacteria once every 15 to 20 days. The whole pool is sprayed evenly, which can effectively decompose the organic matter in the pool, reduce harmful substances, and stop the propagation of germs and keep the water quality good.
Fourth, pay attention to disease prevention
In July, fish, shrimp, and crab diseases have a high incidence of diseases. A variety of bacterial, viral, and parasitic diseases can occur. Inadequate preventive measures can lead to widespread epidemics. The disease is mainly prevention. The main measure is to regularly disinfect the body of water, usually 15 to 20 days to disinfect it once. Use chlorine dioxide, dibromohydantoin, bleach powder or quicklime for regular disinfection of water bodies to prevent the occurrence of diseases. At the same time, vitamin C, immune polysaccharides, and viral additives should be added to the feed regularly to enhance the body's resistance to disease. To seriously check the disease, and strive to accurately diagnose, use high-quality, high-efficiency, low-toxic drugs, timely and accurate medication, so that reasonable use, beware of overdose caused by drug accidents. Possible diseases of fish include viral hemorrhagic disease, bacterial septicemia, enteritis disease, erythroderma disease, gill disease, print disease, white dermatosis, etc., parasitism head disease, Chinese sturgeon disease, etc. The diseases that may occur in crabs include black shank disease and ciliate disease, etc. The diseases that may occur in shrimps include gill disease and red body disease. The diseases that might occur in turtles include red floor disease, skin disease and acne disease.
In summer, the high temperature begins, and the water temperature gradually increases with the temperature. Most aquaculture species enter the upper limit of the suitable water temperature. Therefore, it is the growing season for aquatic animals such as farmed fish, shrimps, crabs, and clams, but at the same time it is a breeding ground for diseases. During the period of spreading, frequent typhoons (or tropical cyclones) and droughts and other disastrous weather, and often strong convective thunderstorms occur, which also have adverse effects on fishery production, is the focus and difficult period of aquaculture management. The quality of feeding and management at this time will directly affect the annual output and economic efficiency. In order to ensure the healthy growth of aquatic animals, and to ensure the stability of high-yield production during the summer season, the aquatic animals are now reminded of the following management tasks and precautions based on the characteristics of climate and aquaculture production in July.