In the first half of this year, the price of tilapia was appreciable. The enthusiasm of breeding households in Guangdong was high and the enthusiasm for investment increased. There was a time when seedlings were in short supply. However, with the arrival of the hot season, tilapia streptococcosis is raging, and many fish ponds have also experienced rapid dead fish. Even in the case of heavy use of drugs, it is unavoidable to cause large losses. Tilapia is year-round. The "first hurdle" of breeding has caused a large number of people to stumble. Then the next "second pass" - how should we respond to the winter? Specially invited senior experts in tilapia production areas to help you tackle the problem of tilapia rearing and disease prevention.
Invited to recruit people: Li Jiang, general manager of Boluo County Xin Weikang Aquatic Products Co., Ltd., member of the South China Sea Disease Prevention and Control Alliance.
Huizhou region is one of the main producing areas for tilapia cultivation. The breeding mode is generally polyculture, and feeding is not carried out in full. In the early stage, organic fertilizer was mainly used as the source of fertilizer and water and bait, and centralized feed was provided 1-2 months before the centralized listing. In this mode, it is easy to cause early nutritional deficiencies, excess nutrients in the later period, and the digestive system is overburdened to cause various diseases.
It is recommended that farmers raise tilapia using the whole feeding method, select high-quality feed, feed the feed in proportion according to the changes in the fish's body weight, do not use organic fertilizer, and do scientific feeding. This model can not only meet the nutritional needs of tilapia at the early stage, enhance physical fitness and disease resistance, but also avoid liver overload caused by excessive feeding at later stages, reducing metabolic and stress problems, and can also effectively improve Water body self-purification capability. Feeding not only can reduce the risk of tilapia disease, but also avoid feed waste and water pollution caused by centralized feeding. The overall input-output ratio should be superior to the traditional centralized feed model. After the tilapia tilapia is raised to the pre-winter stage, the three tasks of bottom reform, detoxification, anti-stress, and hepatoprotection should be taken care of:
Regularly improve the sediment quality of the pond and use a particle-type oxidative disinfection product every 15 days (such as "Beijuan" of Beijing Xinyang Company).
In autumn and winter, the weather changes, and the temperature changes greatly. A detoxification anti-stress product (such as Beijing Xinyang's “stress detoxificationâ€) can be used regularly (every 15 days). At the same time, insect pests (mainly trichomonas) should be regularly tested, especially in weather with a large temperature difference, and the trichomonads can easily multiply. Every 15 days to 20 days, spices are fed to protect liver products, such as "Heidankang" + multidimensional, 3 days at a time, feed 1 meal a day.
During the winter, it is necessary to pay attention to changes in weather at any time, and do a good job of anti-stress related work before weather changes. If you experience a sudden drop in temperature, you can sprinkle salt and then use a disinfectant (such as Beijing Xin Yang's "new germicidal red") to disinfect. Use 1 day - 2 days, once a day to avoid frostbite. In addition to the above points, fish farmers still adopting the latter-stage centralized feeding mode must pay special attention to strengthening water body regulation and protection of liver and gallbladder during the 1 month to 2 months of centralized feeding.
Invited person: Liang Yuewen, head of Zhuhai Liye Aquatic Products Co., Ltd., member of the South China Sea Disease Prevention and Control Alliance.
At the seedling stage (within one month after the seedlings are injected), tilapia farmers must pay attention to controlling water quality and killing parasites (mainly trichoides). Due to the fall and winter season, the weather turns cold and detoxification must be done before killing insects. Usually more multidimensional and lactic acid bacteria products can be fed to enhance the fish's constitution, and it is usually appropriate to use it once a week.
After winter, pay attention to the control material so that no material is left. Regularly change the bottom, change the fish to be more willing to stay at the bottom of the pond, not easy to frostbite, generally 15 days once, use oxygen-enriching and detoxification-based reform products, such as the Hengxing company's production of "pool bottom detoxification Dan" + Calcium peroxide. In addition, appropriate amounts of spices can be fed to protect liver medicines, such as five yellow powder.
When the feeding is started after the beginning of spring, care should be taken not to add the ingredients too fast and regular feeding of liver-protective Chinese herbal products, such as “Hepatic Gallbladder Shu†from Shanxi Kangjie Company, is generally used once every 10 days. When the rain begins to rise, pay attention to disinfection and use iodine preparations to prevent rot.
Weapons: Rong Zhichao, head of Chaoyang Aquatic Clinic, Baitu Township, Gaoyao, member of the South China Sea Disease Prevention and Control Alliance.
The tail batch of tilapia culture is mainly to do the following routine work: to adjust the water quality (not fat and not dirty); to improve the bottom quality, to avoid the toxic substances produced in the fermentation of the pond bottom; one month before the winter to stop the material, avoid Luo Non-fish is too fat or too thin. In addition to the above-mentioned routine work, the cold-proof work during the winter is the most important task in the cultivation of the fall seedlings. According to previous years’ experience, the cold wave generally comes before and after the almanac and the banyan solar terms. It is recommended that the farmers open the aerator every night during the period from Osamu to the beginning of spring. If the cold wave occurs day and night, it will take a long time (3) More than a day's low temperature and rainy weather, together with the use of particulate oxygen.
It was observed that the continued opening of the aerator in the winter fish ponds will cause the water temperature to drop relatively quickly at the beginning, but as the temperature drops to a critical value (about 12°C to 13°C), it will not continue to decrease, but instead it will be in geothermal energy. As a result, it maintains a stable level. The above-mentioned practice of opening the aerator can effectively create continuous convection in the upper and lower water layers, avoid the formation of a temperature difference layer between the surface water and the bottom water, and reduce the possibility of frostbite in the tilapia. Continuous opening of the aerator can also effectively prevent the tilapia from floating. To further reduce the chance of frostbite. In addition, qualified fish farmers can also migrate tilapia to winter shrimp ponds that have been equipped with winter sheds to further increase the antifreeze coefficient.
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