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First, vote for food
The bait is mainly concentrated, and the green is supplemented. Concentrates are fish full-grain pellet feed, bean cakes, cakes, wheat bran, rice bran and so on. The daily feeding amount is 8% to 10% of the weight of the pond. In order to increase the utilization of bait, the number of feedings per day should not be less than 4 times. The bait requires fresh, mildew-free, rot, and its size is appropriate to the size of the fish. Concentrates must be placed in the food court, and various green materials can be placed in floating frames. In summer, the water temperature is high and the weather is changeable. To prevent the fish from floating, you can make more investment in the morning and at noon, and you should invest less in the evening, and do not eat night food for fish.
Second, rational fertilization
In order to promote the continuous growth and reproduction of natural food organisms in fish ponds and improve the production capacity of fish ponds, fertilization should be paid attention to in summer fish ponds. Due to the high temperature in the summer and rapid changes in water quality, fertilization should be based on the principle of less quantity and more times, and it should be applied once every 5 days to 7 days. Fertilizer is mainly inorganic fertilizer and photosynthetic bacteria, supplemented by organic fertilizer. Each time nitrogen is applied per acre, phosphorus is from 2 kg to 4 kg, or photosynthetic bacteria is 10 mg/kg, 50 kg to 60 kg of swine manure and chicken manure are fully fermented. When the transparency of the fish pond is too large and the weather is normal, it can be applied more than necessary. When the fish pond is muddy and the weather is abnormal, fertilization should be stopped and the water must be changed in time.
Third, to adjust water quality
In summer, the water temperature is high, the food intake of fish is large, and the amount of excrement is large. In addition, the feeding and the amount of fertilizer are large, which may cause the fish pond to lack oxygen and affect the growth of fish. Control measures: 1. Increase the water depth of the fish pond to keep it at 2 meters or more, and frequently add new water to increase the dissolved oxygen in the water; 2. Sprinkle lime regularly every 7 days to 10 days. Inject 1 lime per acre. 15 kg to 20 kg. Quicklime has the function of clarification of water quality, prevention of water quality aging, and increase of water body calcium. 3. Configuration of aerators for aerators has the effect of water agitation, aeration, and oxygenation. When using, according to the actual situation, flexible boot.
Fourth, prevent floating head
The pool is usually patrolled three times a day, that is, at dawn, to observe whether there are floating heads of fish; at noon, check the fish eating and activities; at dusk, check the food conditions throughout the day and signs of floating head. We must always remove the leftover grass, dirt and weeds in the pond to avoid polluting the water and affecting the dissolved oxygen in the water. The high temperature of hot water in the sky, feeding and fertilizer, large amounts of organic matter in the water, increased oxygen consumption, fish floating head easily due to lack of oxygen, especially when it is hot nights or thunderstorm weather. In addition to the regular adjustment of water quality, when it is predicted that a floating head may occur, new water should be added in a timely manner or aerobic machine should be started to increase oxygen, and at the same time, stop fertilizing and control the amount of feeding and shorten the feeding time. If it is estimated that a serious floating head will occur, the feeding should be stopped; when the floating head occurs, oxygenation measures should be taken immediately, and yellow muddy water can be added to the pond to add salt water, that is, 10 kg of yellow mud water per acre pond, plus 10 kg of salt Convert to an aqueous solution and mix well and splash it in the whole pool.
Fifth, catch round
To reduce the fish density, more than 1 kg of chain, squid and more than 1.5 kg of grass carp can be sold in mid-late July. At the same time, 0.1 kg to 0.2 kg of carp species, including 150 to 200 fish species and 100 to 150 fishes of summer carp, will be added in each acre pond as a species for the coming year. At the end of August and early September, a group of fish that reached the sale standard were also caught. Fishing should be carried out in the cool morning. This round of fishing can not only bring some fresh fish to market during the off-season to increase economic efficiency, but also reduce fish density, make fish density reasonable, and make full use of the bait.
Six, comprehensive disease prevention
Summer is the peak season for fish growth and it is also the peak season for fish disease. There are mainly bleeding, enteritis, gill disease, Chinese sturgeon and so on. Routine management work should be done to disinfect bait, tools, and water. Each half of the month was sterilized on the food field with 0.5 mg/kg of strong chlorine extract, and the treatment was soaked with 3% saline solution every 20 days for one course of treatment for 5 days.
July-September is an important season for feeding fish and it is an important season for fish production. Therefore, it is necessary to strengthen the management of feeding. The main measures are: