Sustained high temperatures in the summer, resulting in pond water temperature is too high, the water body lacks oxygen, oxidation and decomposition functions decline, water quality deteriorates, fish and shrimp ponds frequent floating heads, once improper management, it is easy to cause fish and shrimp death, Yan Yan, shrimp will be all death. For this reason, Zhou Yongcai, a science and technology demonstrator of the Dongtai City Shunda Aquatic Development Co., Ltd., after years of polyculture of fish and shrimp, summarized summer management measures for fish and shrimp polyculture for reference by the majority of farmers. First, strengthen water quality regulation and management 1. The requirements for water quality of transplanted water-planting and green-crusted shrimps are relatively high. The transparency should be within 30-40 cm, the dissolved oxygen should be above 5 mg/l, the pH should be 7-8, the water quality should be fresh, and it should be fat, live, tender and cool. Requirements, the method is along the edge of the pond around the appropriate transplant growth 1-2 meters wide water peanuts and other aquatic plants. 2. The timely addition of fresh water is the peak season for the growth of fish and shrimp. Generally, every 10 days or so, new water should be filled once. Each time water is added to 20-30 cm, if the water quality is too fat, the transparency is low, or the old water, it should be taken. Water is added to the inlet and the bottom outlet. 3. Control the transparency of the water body. Summer should reduce or stop the application of organic fertilizer. Appropriate amount of additional fertilizer can keep the plankton at a suitable density and a strong growth state. Use a small number of fertilization methods, and pay attention to the pond at any time, observe the water color, and control the top dressing amount according to the body's fatness. If the pool water is yellow-brown or soy sauce, and the transparency is above 40 cm, the amount of fertilizer should be increased. If the water is dark, the transparency is below 25 cm, the water has a bad smell, or the fish and shrimp have a serious floating head phenomenon, it means that the water quality is too fat or When the water quality deteriorates, it is necessary to stop fertilizing and inject new water in time to improve water quality. 4. The principle of flexible starting oxygen increase aerators is: sunny noon boot, cloudy days the next morning boot, rainy days or night before and after the water and fat fish boot, does not boot in the evening, appear floating head immediately boot. 5. Application of purified water regularly Quanchiposa lime water purification, generally 15-20 kg of lime per acre of water. Improves and precipitates turbidity and organic matter in the water, which acts to purify the water. 6. Diligent patrol ponds do a "three look" to check: look at the weather, see the color of the water, and watch how the fish eat. According to the weather, water quality, changes in fish eating and drinking activities, timely adjustment of water quality. Second, timely catch hot water fish and shrimp After August, the density of fish in ponds will increase, and the fish load will be high. If fish that have reached the food specifications are not caught and listed in time, it will affect the growth of fish of smaller size and postpone the next time of arrest. Affects annual production. Fishing should pay attention to fishing methods and weather changes to avoid death. When fishing, please note the following: 1. Before catching, it is necessary to stop feeding for one day and the water temperature is high in summer. The fish eat well, have strong activity, increase oxygen consumption after ingestion, increase activity capacity, consume physical strength, and have high mortality during transportation. 2. Proper drainage prior to harvesting generally drains 1/3-1/2 of the pond water, which facilitates net fishing. 3. Time to catch when catching Summer fishing is required when the dissolved oxygen is high. In order to adapt to the "morning market" supply and need to catch fish in the middle of the night, you should choose sunny and cool climate. However, when there are signs of floating heads and floating heads, it is forbidden to pull fishing nets. In order to avoid early convection in the upper and lower water layers and to increase the oxygen consumption factor of night water, it is easy to cause floating heads. 4. After catching fresh water after catching, new water should be added after catching, and water should be added to the original position to allow the fish to have a period of countercurrent flow of the top water. This can wash off the mucus secreted from the fish, especially the attachments on the fish larvae. It is good for fish to restore physique and increase dissolved oxygen in pool water. 5. Disinfect the water in time after catching, and promptly disinfect the body of water after fishing. Generally, dibromohydantoin 0.2g/m3 or chlorine dioxide 0.3g/m3 or bleaching powder 1g/m3 can be used for Quanchiposa. Third, scientific and rational feeding Scientific feeding and management are the key to raising the survival rate of shrimp. First of all, we must do the bait feeding work. When feeding, it is mainly formulated feed, supplemented by green feed, pay attention to coarse and fine collocation, adhere to the principle of "two fine, medium thick, with vegetarian, fixed feeding." The number of feedings is also a small number of times. Generally, the concentrate feed is fed 2-3 times a day, and the feeding is performed every day. The amount of feeding is 3%-5% of the body weight of the pond, and the feed is fed for about 3 hours. For the best amount of bait, 30%-40% of the total daily amount is fed during the day, and 60%-70% of the full-day amount is added during the evening. The bait should be placed in the shallow water area around the shrimp pond to allow the shrimp to feed. Fish feeding should adhere to the "four principles" principle. 1. Feeds that are fed directly by quality require fresh, palatable, undamaged and nutritionally complete. And after choosing a good feed, do not change the feed frequently, because changing the feed can also cause the food intake of the fish to decrease. 2. Quantitative fishes are variable-temperature animals. Seasonality, climate, water temperature, whether floating head, size of fish body, and feeding and digestion methods are different, which have a great impact on food intake. Under normal circumstances, the amount of bait is calculated based on the water temperature and the size of the fish body (in May and June, 2%-3% of fish body weight, and in July, August and September, 3%-5% of fish body weight). Feeding by quantity is not enough when you are hungry. However, if the weather is abnormal, you must reduce or stop feeding. 3. Timing timing is to have a relatively fixed time, usually 2-3 times in the morning from 9 am to 4 pm. Also, according to the fish size, climate and water temperature, the number of feedings should be controlled flexibly. Once time is selected, it must be relatively stable. 4. Positioning and feeding the feed must have a fixed food field, so that the fish is used to eating food in a fixed food field, which is conducive to observing fish activities and eating conditions, and is also conducive to disease prevention. The method is to set up a feed food table in a pond or use a bait feeder to feed at a fixed position, and it is required to feed in a convenient, sunny, open, and quiet place. Fourth, adhere to fish disease prevention and treatment Sustained high temperatures can easily lead to the proliferation of bacterial pathogens, deterioration of water quality, and the outbreak of disease. Therefore, we must adhere to the principle of “prevention and health managementâ€. Special attention should be paid to the occurrence of disease and prevent disease. 1. Adherence to sterilization of sterilized bait, aquatic plants are generally soaked in 3% saline for 30 minutes, manure is added after mixing with 500 kg of bleach and 120 g of bleached powder; used tools are scrubbed with a 5% bleach solution before use; Regularly use 0.2 g/m3 of dibromohydantoin or 0.3 g/m3 of chlorine dioxide to sterilize food and water bodies. 2. Adhere to the patrol ponds to adhere to each patrol pond every morning, evening and night, observe pool fish activities, food intake, floating heads, etc., master the fish physiological activities, and timely adjust the feed feeding plan and measures, and find problems in a timely manner to take effective The method is processed. 3. While persisting in the prevention of high temperatures during disease prevention, it is prone to develop black bark disease and bacterial bacterial bleeding and enteritis in fishes. The prevention and control measures are as follows: 1 Regularly throwing lime at a rate of 20 g/m 3 or 0.3-0.5 g/m 3 chlorine dioxide or 1 g/m3 bleach for 2-3 consecutive days; 2 mix 2-5 g of siloxacin or allicin per kilogram of feed per month for 4-6 consecutive days A treatment. JRT OEM Digital Laser Range Finder can measure faster, easier, and more effectively! Our Professional R&D team has over 16 years of experience on the laser and measurement field , so we can supply perfect OEM/ODM service according to user requirement ,and we have made out the mini size module in the world. Handheld Laser Meter,Handheld Laser Distance Meter,Laser Range Meter,Laser Distance Measurer Chengdu JRT Meter Technology Co., Ltd , https://www.infrareddistancesensor.com
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Summer management measures for fish and shrimp polyculture ponds