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First, raise the water level and increase the volume of the aquaculture water body. After entering June, due to the gradual increase of the water temperature, the surface of the water body has a large amount of evaporation, and the water level drops. In addition, the tilapia culture has a small specification at the early stage, and the pond load is not high, but it reaches a high temperature period. Tilapia really entered a period of rapid growth and the fish load in ponds increased. Therefore, in this period of time to raise the breeding water level, increase the volume of aquaculture water, the pond water level should be maintained at 2m ~ 3m, and fresh water at any time, to reduce the impact of water resistance tilapia growth, delayed the time to market.
Second, reduce the water quality, improve the dissolved oxygen content of water Tilapia fish fed natural food organisms at seedling stage, require water quality more fertilizer, and the combination of fertilization and feeding combined farming methods. Once entering the hot season, it is necessary to reduce fertilization, especially in high density ponds. Due to the high water temperature and large water body fat, the dissolved oxygen in the water will decrease, which will cause water quality deterioration. Therefore, in the high temperature period must control the amount of fertilizer, keep the water fresh, the transparency of the water control in the 25cm ~ 30cm or so, keep the pond water quality live, tender, water can be filled with fresh water, to flush freshwater fertilizer, or use quicklime Adjust water quality and increase dissolved oxygen content in water.
Third, the use of physical and chemical measures, reasonable use of oxygen machine water temperature, increased oxygen consumption of organic, high breeding density will result in reduced dissolved oxygen, in addition to the use of new water to adjust the water, but also reasonable use of oxygen aerator, with Increase the dissolved oxygen content in the water. In the hot season, insist on starting the aerator for 1 hour to 2 hours in the sunny afternoon. Stir the water body and make the dissolved oxygen in the upper and lower layers of the water reach saturation. You can postpone the time of nocturnal hypoxic floating in the night. For high-density culture ponds, normally start at night. Oxygen generators, especially in the case of rainy days or sudden changes in the weather, should pay more attention to the boot and prevent flooding.
Fourth, strengthen management, timely prevention and treatment of fish diseases in the hot season, because tilapia grows most vigorously, but also fish disease-prone season, in addition to stepping ponds to observe the water quality, fish growth, etc., but also pay attention to prevention and treatment of fish diseases happened. Generally, every 15 days to 20 days, about 15kg/mu ~ 20kg/mu of quicklime is used to water in Quanchiposa to regulate water quality and kill bacteria; chlorine dioxide is used to sterilize aquaculture water and feed stations every month. Secondly, the concentration is 0.25 ppm to 0.3 ppm, and Chinese herbal medicine is regularly added to the feed to prevent fish diseases. For pellet feed or extruded pellet feed, the protein content is required to be about 28% to 30%, which is fed twice a day. The feeding time should be controlled at about 40 minutes to 60 minutes, and the feeding time should be uniform. Most of the fish can eat feed, feeding the amount of 3% to 3.5% of the total weight of the fish, and according to the growth of the fish, feeding conditions at any time to ensure that the normal growth of tilapia and improve feed utilization. In the hot season, due to the changeable weather, more attention should be paid to the weather forecast. For example, if the air pressure is low and thunderstorms occur, feeding or non-feeding should be reduced to avoid wasting feed and contaminating the water and affecting the growth of tilapia.
V. Timely emergence of ponds to reduce pond volume Because the growth of tilapia is limited by the water temperature, during the cultivation period (especially during the high temperature period), some of the listed tilapia ponds will be exported to reduce the pond density. , so that small-scale species of fish can grow as soon as possible, can improve the economic benefits of the entire culture. During the high temperature period, tilapia should be selected for fishing on a sunny day, and feeds should be stopped and fresh water should be added to the pond. It is better to carry out a pull-net exercise before going out of the pond, which can reduce the difficulty of adult fish transportation.
Problems to be Noted in High-density Farmed Tilapia
The high-temperature season from June to September each year is a period of vigorous growth of tilapia. In the case of high-density farming, how to make good use of this period of high temperature to promote tilapia to market specifications as soon as possible, the author believes that the following should pay attention to the following: aspect.
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