July Aquaculture Production Management Measures
Due to this year's climate anomalies, drought and less rain, the water level in the rivers has decreased significantly compared with the same period of last year, and the water quality of the aquaculture waters has generally been poor. Many farmers have considered that the water quality is poor and no water is added, resulting in a generally low water level in the ponds. At present, due to the continuous high temperature, the pond water temperature has risen to 28°C-30°C, and the risk of breeding has gradually increased. Especially in the Meiyu period, the weather is still changing. It may happen during thunderstorms and the weather is hot. If not, prevent it as soon as possible. Countermeasures will seriously affect current water production. In order to ensure the safety of water production during the summer hot season, the following measures are proposed: 1. To improve the breeding environment. 1. Raise the water level in the pond. In view of the fact that the water level in the ponds is low, and the water sources outside the river are poor, the method of gradually adding pool water three times in a short period of time is used to gradually increase the water level of the pond to more than 1.2 meters. Each time you add water, select the weather from 10 a.m. to the afternoon. 2 times. 2, increase water dissolved oxygen. Oxygen-increasing equipment can insist on turning on the oxygen aerator for more than 2 hours at noon on sunny days. In case of overcast or rainy weather or sudden changes in the weather, it is necessary to open the aerator in time. If there is no aerator, a submersible pump can be used to make the circulating water in the pool (the time should not be in the evening before 3 pm) to enhance the convection and exchange of the water body. 3, biological regulation of water quality. At present, all types of cultured species have entered a golden period of growth, but at the same time as they are eating well, their excretion has also increased significantly, accelerating the deterioration of water quality. For this reason, it is recommended to choose a variety of microbial preparations of biological preparations spilled, regulate water quality, specific usage and dosage and precautions in accordance with the instructions to use correctly. 4. The use of river nets for raising crabs should be used to shave shades of water and grass, reduce direct sunlight, and reduce the water temperature. If there is an oxygen deficiency phenomenon, the propeller can be used to push water to increase oxygen and increase the flow of water. Second, strict scientific management of feeding. 1, according to the nutritional needs of different cultured objects, feeding a comprehensive nutrition feed, should not be fed mildew bad feed. 2. It is advisable to control the amount of feed to be fed within 2 hours to prevent the residual bait from corrupting the water quality. 3. One of the fish feeds to be fed in crab culture should be fresh, in order to prevent internal organs disease and pollute the water quality. Third, actively work on disease prevention. 1. Use chlorine dioxide, dibromohydantoin, bleaching powder or quicklime to conduct regular disinfection of water bodies to prevent and control the occurrence of diseases. 2. Add appropriate amount of Vc, immune polysaccharide or internal medicine in the feed at intervals to enhance the disease resistance of the cultured objects. 3. When diseases are found, diagnosis and treatment should be promptly taken to avoid complications. When using drugs, follow the instructions of the aquatic technicians, select high-quality, high-efficiency, and low-toxic drugs, and reduce the amount of medication, so that reasonable use can be made and care should be taken to prevent drug accidents caused by overdose.
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