Aquaculture fishery in June

As the temperature climbs, summer has arrived. June is a key season for aquaculture production. Temperatures and water temperatures will continue to increase throughout the country, and rainfall will increase, and sunshine hours will increase significantly. Fish, shrimp, crabs, clams, shellfish and other aquaculture animals have obviously increased appetite, increased food intake, and have entered a period of prosperous growth. The majority of farmers must seize it. In the meantime, it will encounter the rainy season, with thunderstorms and typhoons all over the country. Climate change is erratic, and it is easy to form hot, low-pressure hot weather. Therefore, June is also the main season for water quality change, disease outbreak and epidemic, and prevention should be strengthened. Here are some suggestions on the issues that should be noted in the characteristics of aquaculture production in this season for farmers' reference. I. Breeding of conventional freshwater fishes In June and June, fish fry cultivation period began. According to the growth situation, the ponds should be reared in time or sold as seedlings of the summer flowers, and then enter the cultivation period of the fish species. Before the stocking, the seedlings should be disinfected with clear ponds. When they are stocked, they must be sterilized with saline or potassium permanganate before entering the pool to prevent bacterial infection. To purchase seedlings from other places, it is necessary to conduct quarantine, striving to avoid seedlings from infected areas and to avoid the introduction of pathogens. 2. Management of adult fish farming: (1) Fish gradually enter the peak season of growth, and fertilization and feeding should be strengthened. Ponds with mainly fish and fish should be topdressed according to their color and transparency. For ponds or cages that mainly eat fish, feed should be fed in a timely manner, and feeding should be done to “Four Sets”; (2) Pay attention to water quality regulation. According to the weather changes in time to increase oxygen and water. As the food intake of fish increases at this time, excretion also increases, and the water quality tends to deteriorate, resulting in lack of oxygen. Therefore, aerators need to be oxygenated in time every day depending on the weather, water quality, etc. In the event of showers or hot weather, the oxygen aeration time should be extended. At the same time, new water should be frequently refilled, water levels should be raised constantly, and some of the bottom water should be replaced. Advocate the use of beneficial microbial agents to improve water quality. During the Meiyu period, it is best to apply photosynthetic bacteria or EM bacteria every 15 days. The whole pool is sprayed evenly, which can effectively decompose the organic matter in the pool, reduce harmful substances, and stop the reproduction of the bacteria and maintain good water quality; (3) Doing well in disease prevention. June has not entered the real summer high temperature period, the water temperature is relatively appropriate, and various pathogens in the water are prone to breeding, which is the season for fish easy to attack. If neglected, prevention can easily induce fish disease. During the period, major diseases that are prone to be outbreaks and epidemics are saprophytic disease, putrefaction disease, gill disease, enteritis disease, hemorrhage disease, echinococcosis, trichoderma disease, angiosclerosis, and myxosporidiosis. The focus should be on prevention of bacterial and parasitic diseases. Regular use of quicklime, chlorine dioxide, dibromohydantoin, or microbial preparations to disinfect and improve water quality. (4) Strengthen day-to-day management and stick to duty on duty. In June, the weather was changeable and there were frequent thunderstorms and hot days. It was necessary to pay more attention to the observation of fish eating and the lack of oxygen floating heads. It was found that the signs of hypoxia should be promptly injected with new water and aerators, and pans should not be created. Dead fish. Second, the crustacean culture 1, Macrobrachium rosenbergii and white shrimp farming in South America: From late April to May is mainly the stocking season of shrimp. Before the stocking of shrimps, clear pond disinfection and water quality cultivation work must be done. The cultured shrimp should be purchased with high quality, disease-free bacteria. By June, various types of shrimps had been basically stocked and gradually transferred to the shrimp farming stage. However, the time for putting the seedlings into the pond is not long. Most of them enter the pond for only 20-30 days. At this time, attention should be paid to check the quality of the seedlings, the growth and the survival rate, etc., and find that the situation is not good, and the seedlings should be promptly replanted or even replaced. Seedlings, so as not to affect the year's aquaculture production. At the same time, in normal weather, feed as much as possible to feed the shrimp. The main disease of Macrobrachium rosenbergii at this stage is white body disease, also known as whitish turbid disease, which often occurs in late May and early June, that is, within one month after the release, once the disease has occurred, the mortality rate is high and the damage is extremely great. The main method of controlling white body disease is to make a good quarantine when entering the seedlings to prevent the introduction of the white body disease virus into the pool. The same is true for Penaeus vannamei, and inspection and quarantine must be done when entering the seedlings to prevent the introduction of various pathogens. In June, the susceptible species of Penaeus vannamei were white spot disease, red body disease (Tola disease), red leg disease, and black mole disease. Therefore, it is important to prevent viral diseases and bacterial diseases in aquaculture. Production management should take into account changes in the weather in May and June, prone to anoxic pans and diseases, and take comprehensive prevention and control measures to strengthen water quality management, strictly control the amount of feed, attach importance to the detection of the disease, and take timely detection of abnormalities Emergency measures. Green shrimp generally pay attention to water quality management, and it rarely occurs. It is mainly prevention. 2. Crab farming: In June, crabs have been stocked for several months. At this time, attention should be paid to water quality regulation and scientific feeding. The water surface should be timely transplanted with water peanuts or leeches and other shaded plants, and underwater plants should be planted with submerged algae such as Hymenocallis fulva and Vallisneria, so as to create a good ecological environment for the inhabitable growth of crabs. This season is also a period of frequent occurrence of disease in river crabs. The main diseases are trembling disease, scrofula syndrome, and ciliated ciliate disease. We must adhere to the principle of ecological control, supplemented by drug control. Disinfection usually takes lime, bromochlorohydantoin, etc., or regular use of beneficial microbial agents to maintain the microecological balance in crab ponds. Third, the breeding of amphibians / reptiles, soft-shelled turtle (cockroach) breeding. The soft-shelled turtle will start spawning and hatching in May. By June, there will be a large number of juveniles hatching. One should do a good job of collecting and hatching in time, and the other should strengthen the intensive cultivation and disease prevention measures of juveniles. Before entering the pool, juveniles must be sterilized by a medicinal bath to prevent germ infection. When purchasing foreign products in foreign countries, inspection and quarantine shall be strengthened and strict disinfection shall be conducted. As the temperature of greenhouse-raised soft-shelled turtles rises significantly, ventilation and air-conditioning should be taken into account, and the regulation of water quality and reasonable feeding of feed should be strengthened. Turtles raised from the greenhouse to the pond for rearing need to be moved at a water temperature of 25°C or higher. It is best to move them when the weather is fine. Minimize damage and mutual bite during operation to avoid infection after entering the pond. In June, the most common diseases of the soft-shelled turtle include skin perforation, red floor disease, white floor disease, red neck disease, and acne disease. The perforation of perforated skin is more prominent, and preventive measures should be taken actively. Turtles are basically the same species as turtles. Current turtles have tortoises, snapping turtles and other edible turtles, and Brazilian turtles, green turtles and other ornamental turtles. They are good from the development trend and have a certain market, especially South of our country. 2, frog breeding. The frog species currently bred mainly include bullfrogs, American frogs, and spiny-breasted frogs (stone frogs). The culture and breeding methods are basically the same. The spiny-breasted frogs are mountain stream frogs and require higher environmental requirements than bullfrogs and frogs. some. The reproduction periods of the three species of frogs are all from May to June. From late May to June, it is the peak season for breeding and cultivating seedlings. It should actively create a good breeding and ecological environment. Adult frogs do not eat dead baits because of natural frogs. Therefore, in large-scale artificial breeding of frogs, it is very important to start bait domestication from young frogs, and it is also the key to successful breeding. June is a disease-prone season, prone to red-leg disease, enteritis disease and other diseases, should be fed a comprehensive diet of food, regular use of oral antibiotics for external use, timely prevention and treatment. In April and June, it is the main season for pearl aquaculture. Fertilizer should be applied promptly to cultivate good water quality. Quicklime should be applied regularly to adjust PH value. At the same time, it is necessary to strengthen the prevention of diseases. The main diseases of river rafts include rotten gill disease, menopausal ulcers, and rotten axe. The prevention and treatment of different symptoms should be timely.

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