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Spring fish pond feeding and management points
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, but also due to low temperature in early spring and less fry activity. During fishing, transportation and delivery, fish are not easily injured and the survival rate of fry is high. In the specific operations should pay attention to the following points: First, a reasonable stocking If the aquatic plants are abundant, it is advisable to raise the grass carp and carp; if the fat source is sufficient, the carp, catfish, carp, tilapia can be raised; More than enough water can support 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 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 issues should be taken into account: 1. The clear pond pond must be thoroughly remedied before the fish species are stocked. After that, 100 kilograms of lime and 60 kilograms of tea bran were used per acre, and after 48 hours of water soaking, Quanchiposa was splashed. The role of quick lime in addition to kill wild fish and pathogens in vitro, but also improve the soil, and acidity, increase the pH, release nutrients, ensure the benign circulation of organic matter, increase the water's fatness. The tea bran can be used to cultivate plankton-rich plankton, and the disappearance of medicinal properties is also a nutrient feed for fish seedlings. 2. As for the quality of fingerlings, as the saying goes, “Cultivate half a pond fishâ€. This shows 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 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 drugs are lacking in remote mountain areas, fish bodies can be soaked in 4% saline solution for 20 minutes to 30 minutes, and the disinfection effect is also good. 4. The transportation of fingerlings should not be delayed as soon as possible. Generally, it is better to finish the transportation before the water temperature below 15°C and end of March. Tilapia is a tropical fish and it will have to be stocked in May. The length of transportation is one of the key factors that determine the success or failure of transportation. Under normal circumstances, the transportation time is inversely proportional to the shipping density and the transportation 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 stocks of fingerlings 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 swim into the pond. Second, raise the water temperature within the appropriate temperature range, the fish will increase food intake as the water temperature rises, and accelerate growth. Therefore, the water level in the early spring fish pond 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. 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 As the temperature and water temperature rise gradually after the spring begins, the fish's biological baits begin 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 of lime can be splashed into the water per acre. When the water quality is lean, appropriate organic fertilizer is applied to maintain the medium-fertilizer quality. The water transparency is suitable for 30 cm to 40 cm. Fourth, timely start eating fish species should mainly do the following two aspects: 1. Fertilizer fish seedlings before the next pond 7 days (3 days after clear pond disinfection), Mushi 250 kg to 350 kg fattened The human excrement, or acres of urea 2.5 kg, 5 kg of calcium hypercaloric, to cultivate plankton, so that there is ample natural food after the fish pond feeding. 2. Feed timely feeding of nutritious artificial compound feeds to enhance the body composition of fish and accelerate their 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 a small area of ​​turbidity from the bottom to the surface of the pool is found and fish activity is frequent, it means that the fish are hungry. The specific practice of opening food is to feed the fish once a week when the surface water temperature of the fish pond reaches 3°C. When the surface water temperature of the fish pond rises to 10°C in sunny weather, it is necessary to feed it 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 to use 3 to 5 days to sprinkle a small amount of fine material on the edge of the table near the pool for food, then gradually reduce the spread range, until the designated feeding on the table. V. Prevention and control of diseases The principle of “prevention from prevention and combination of prevention and treatment†should be implemented. In spring, 20 kg of quicklime per acre should be poured every spring to regulate water quality and enhance the buffering capacity of the water body; or use 1ppm bleach to sterilize and disinfect. If parasites occur, 0.7ppm copper sulphate and ferrous sulfate mixture (5:2) can be sputtered to 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. 400 mg/kg salt and 400 mg/kg baking soda mixture can be used to control the whole pool by splashing or dipping fish. 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.