Grasping the rearing and 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. It is generally appropriate to put it in the months of 2-4 months. The following points should be paid attention to in the specific operations: 1. Reasonable stocking: According to the local food and water quality conditions, determine the main breeding species. If there is abundant water grass, it is advisable to raise grass and squid; if there is sufficient fat source, it can raise squid, squid, squid, and tilapia; in areas with many snails and fleas, it can raise herring and squid. 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 crude fish ponds have 500 to 1,000 tails per mu. In order to increase the output per unit area, rational polyculture of multi-species and multi-species fish species should be implemented. In the stocking process, the following points should be followed: (1) Clearance of clear ponds: Thorough remediation of ponds must be performed before the fish species are stocked. Pumping dry ponds, removing excess silt, repairing pond bases, entering and exiting sluice gates, and providing a good growing environment for farmed fish. After that, 100kg of lime and 60kg of tea bran were used for the mu, and the whole pool was splashed after breaking the water 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, increase pH, release nutrients, maintain the benign circulation of organic matter, increase the water's fatness. While tea bran can cultivate plankton-rich plankton, the disappearance of medicinal properties is also a nutritious feed for fish seedlings. (2) The quality of fingerlings: As the saying goes, “Cultivate a half pond fish†means the importance of the quality of fingerlings. The fish species of the same age should strive for orderliness, good development, bright color, strong physique, active swimming, strong reverse water, and intact scales on the body surface. There should be no fish diseases or parasites. (3) Disinfection of fingerlings: Disinfection of fingerlings is an effective method for 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 in 4% saline solution for 20-30 minutes, and the disinfection effect is also good. (4) Fish species clearance: It is advised that fish species should be transported sooner rather than later. Generally, it is better to finish the transportation before the end of March when the water temperature is below 15°C. If tilapia is a tropical fish, it will have to be stocked by the month. The length of transportation is one of the key factors that determine the success or failure of transportation. Under normal circumstances, transportation time and shipping density are inversely proportional to the transport survival rate, which is proportional to the transportation cost. Therefore, under the conditions permitting, we should do everything possible to shorten the transport time and improve the survival rate of transport. (5) Raising fish stocks: Fish stocking should be selected when the weather is high on sunny days. 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 go by themselves in the pond. Second, raise the water temperature: In the appropriate temperature range, fish will increase food intake as the water temperature rises, and accelerate growth. Therefore, the water level of the fish pond in early spring should be controlled at 0.6-0.8m, 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. For ponds with poor water retention, when filling with fresh water, do not inject large amounts of water each time to prevent the temperature of the water from dipping. 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, adjust the water quality: After the spring, as the temperature, water temperature gradually increased, the fish's biological feed began to breed. If the water quality is found to be aging and acidic, 20cm deep new water can be injected, and 20-30kg limestone can be splashed into the whole water per acre. When the water quality is lean, appropriate organic fertilizer is applied to maintain the medium-grade fertilizer and water quality. The transparency of water quality is 30-40cm. Fourth, in time to eat: fish species should mainly eat the following two aspects of work: (1) fertilization: fish seedlings before the next pond 7 days (clear pond disinfection after 3 days), Mushi 250-350kg made of fermented rot cooked The manure excretion; or acres of urea 2.5kg, 5kg of calcium hypercaloric acid, to cultivate plankton, so that there are enough natural food after the fish pond pond feeding. (2) Feeding: Feed the nutritious artificial compound feed in time to enhance the fish's constitution 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 many small areas of muddy water appear on the bottom of the pond and fish activity is 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 fish pond surface rises to 10°C when the weather is warm and sunny. Need to feed once a day or every other day. Each feeding amount is about 1/6 of the amount of feeding in summer and autumn, or eating in 3-5 hours. At the same time, it can be introduced and domesticated. The method is: first use 3-5 days to sprinkle a small amount of fine material in the pool near the food table to attract food, and then gradually reduce the spread range, until fixed-point feeding on the food table, which can improve food utilization. Fifth, early prevention of disease: fish, such as long-term hunger, will cause growth stagnation, 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 prevention from combiningâ€. In the spring of each spring, 20kg of quicklime water is poured on the Mu to regulate water quality and enhance the buffer capacity of the water body; or use 1ppm bleach to sterilize and disinfect. If there are parasites, the use of O.7ppm copper sulphate and ferrous sulphate (5:2) water may spill and give the fish a good ecological environment. In addition, in the pond early spring water injection, it should be injected as much as possible winter water storage, because of this water with less bacteria, which will help reduce the occurrence of fish disease. 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. Available 400mg/kg salt and 400mg/kg baking soda mixture, Quanchiposa or dipped in fish for prevention. In addition, parasitic diseases such as trichomonads and slugs also occur from time to time, and can be treated with 0.7 Ppm copper sulfate and ferrous sulfate (5:2) in combination with Quanchiposa.
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