One year's plan is spring. The management of spring fish ponds can not only promote the fish to eat earlier, restore constitution, extend the growth period, increase yield, enhance disease resistance and increase survival rate. Moreover, due to the low temperature in early spring and less fry activity, it is not easy to be injured during fishing, transportation, and delivery. The survival rate of fry is high. In the specific operation, we must pay attention to the following points:
First, fish ponds should be reasonable
According to the local food and water conditions, determine the main breeding species. If grasses and dry grass are abundant, grass carp and carp should be raised. If the fat source is sufficient, you can raise squid, squid, squid, and tilapia. The area where there are many snails and clams can raise herring and mackerel. The amount of stocking depends on the conditions of the pond and the level of feeding and management. Intensive culture of fish ponds generally put 1,500 to 2,000 tails per acre, and rough fish ponds have 500 to 1,000 tails per acre. In the stocking process, the following issues should be addressed:
1. Clear disinfection of the pond. The pond must be thoroughly remedied before stocking. Pumping dry ponds, removing excess silt, trimming the pond base, and entering and leaving the sluice, so that the cultured fish have a good growing environment. After that, 100kg of lime and 60kg of tea bran were used for the mu, and the whole pool was splashed with water after breaking and soaking for 48 hours. The role of quick lime in addition to kill wild fish and pathogens in vitro, but also improve the soil, and acidity. While tea bran can cultivate plankton-rich plankton, the disappearance of medicinal properties is also a nutritional feed for fish seedlings.
2. Fish disinfection. Disinfection of fingerlings is a practical and effective method of cutting off pathogens and preventing fish diseases. Before the fish species is under the pond, it should be washed with 10ppm bleaching powder or 8ppm copper sulfate for about 20 minutes, or the two drugs can be used simultaneously. If the above-mentioned drugs are lacking in remote mountain areas, fish bodies can be soaked with 4% saline solution for 20-30 minutes, and the disinfection effect is also good.
3. Raising fish stocks. The stocking of fish species should be selected when the weather is high on sunny days, and avoid rain, snow, and windy weather. The place of stocking should be chosen to be sheltered from the wind and place fish containers (pots, buckets, etc.) into the water so that they can slowly tilt and allow the fry to swim into the pond.
Second, improve the water temperature in time
Within the appropriate temperature range, fish will increase food intake and increase growth as the water temperature rises. Therefore, the water level of fish ponds in early spring should be controlled at 0.6 to 0.8 meters, so that the water temperature can be raised quickly to facilitate the full play of the fertilizer effect and promote the fish to eat earlier. After the spring, inject water. When adding new water, do not inject a large amount of water each time to prevent the temperature of the water from dropping. At the same time, appropriate organic fertilizers should be applied to improve the water temperature. In case of continuous rainy weather, the depth of pool water should be increased to prevent the water temperature in the pool from changing too much.
Third, water quality regulation should be appropriate
After the spring, as the temperature and water temperature gradually increased, the fish's biological feed began to breed. If water quality is found to be aging and acidic, 20 cm deep new water can be injected and 20 kg to 30 kg lime can be splashed into the water per acre. When the water quality is lean, appropriate decomposition of organic fertilizer is applied to maintain the medium-grade fertilizer quality. The water quality transparency is preferably 30 to 40 cm.
Fourth, investment and fertilization should be scientific
Fish species should mainly perform the following two tasks when they eat:
1. Fertilization: fish seedlings in the first 7 days under the pond (after 3 days in the clear pond disinfection), Mushi 250 kg ~ 350 kg of human feces and urine that has been fermented and fermented; or 2.5 kg of urea, 5 kg of calcium perchlorate , cultivate plankton so that there is plenty of natural food behind the pond.
2. Feeding: Feed the nutritious artificial compound feed in time to enhance the body composition of the fish and accelerate its growth. When the surface temperature of the fish ponds rises to about 10°C, the fish begin to eat small amounts of food and they sometimes have large food intake. If there are multiple small areas of muddy water appearing on the bottom of the pool and fish activities are frequent, then the fish are in a state of starvation. The specific practice of opening food is: when the surface water temperature of the fish pond reaches 3°C, feed once a week; when the water temperature of the surface of the fish pond rises to 10°C in sunny weather, it is necessary to feed once a day or every other day. Each feeding amount is about 1/6 of the feeding amount in summer and autumn, or 3 hours to 5 hours. At the same time, it can be introduced and domesticated. The method is:
First use 3 days to 5 days to sprinkle a small amount of fine material on the edge of the food table near the pool to lure, and then gradually reduce the spread range, until the designated feeding on the table, which can improve food utilization.
Fifth, attention should be paid to the prevention and treatment of fish diseases
Long-term starvation of fish causes stagnant growth and increased disease. Therefore, strengthening the early feeding and management of fish is an effective way to increase fish disease resistance. We must implement the principle of “prevention from prevention and combination of prevention and controlâ€. In the spring of each spring, 20 kilograms of quicklime should be sprinkled with water in order to regulate water quality, enhance the buffer capacity of the water body, or be sterilized and sterilized with 1ppm bleaching powder. If parasites occur, 0.7ppm copper sulphate and ferrous sulphate (5:2) water can be spilled to give the fish a good ecological environment. In addition, when the fish pond is filled with water in early spring, it should be injected as much as possible into the winter water storage. Because of this small number of water-borne pathogens, it is beneficial to reduce the occurrence of fish diseases. The fish disease that often occurs in spring fish ponds is mainly watery mildew. This is a fungal disease. It is caused by injury caused by careless operation in management. Salt and baking soda mixture can be used, Quanchiposa or dipping fish to prevent and control. In addition, worms such as trichophae and parasitosis also occur from time to time, and can be treated with 0.7ppm copper sulfate and ferrous sulfate (5:2) mixture, and Quanchiposa.
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