The three-dimensional fish farming in the semi-flowing pond is a new type of pond fish culture that was successfully tested by Comrade Yang Changrong, a fishery expert from Sichuan Province. More than 10 years of practice has proved that the semi-fluid-water pond has a high density of three-dimensional fish, a high survival rate, and easy management. This technique is described below. First, the pond construction of semi-flow ponds Three-dimensional fish farming area of ​​1 to 10 acres (667 m 2), water depth of 1.5 to 2.5 meters is appropriate, all year round to have a certain flow of water (preferably natural water). If you plan to produce 1000 to 1500 kilograms of adult fish at 667 m2, the natural flow at the inlet section must ensure that every 667 m2 of area can obtain 30 m3 of water in one hour. For this reason, the number of inlets should be large and the width should be large. The drainage system is to build a water blocking wall in front of the drain pipe at the bottom of the pool, and install a barrage near the bottom of the wall in the middle of the wall. Walls can be made of bricks, stones, and cement. The two ends are closely connected with the pool embankment, and the height is flush with the pool embankment to prevent fish from escaping. It is best to use a wire mesh or steel bar to fasten the fish grille on the wooden frame, and the size of the grid hole can not run out with the smallest fish species. The area of ​​the barb is preferably 0.5 to 1 times larger than the total inlet section. In this way, water is injected at any time during the entire breeding period. Excess water (mainly bottom water) in the pond will pass through the fish trap and flow out from the drainage hole that reaches the holding water level and flows into the drainage ditch outside the pond through the culvert. Second, the fish stocking stocks before the release of 10 to 15 days before draining pond water, every 667 m 2 with lime 60 to 75 kg thoroughly disinfected, 6 to 7 days after irrigation fertilization. Generally, every 667m2 is used to excrete 500-800kg of manure. Three-dimensional flow of ponds in the three-dimensional culture, generally 1 to 3 kinds of fish can be used as the main fish, and the other with a small amount of other fish species, so that water and all kinds of feed to make full use of. In order to raise fish, the ratio of 667 m2 to net production of 1,000 kilograms of fish is mainly fish, silver carp 100-200 g/tail, 50 g/tail, 350 to 380 tails and 400 tails, respectively. Carp 150 to 250 g / tail, 50 g / tail stocking 120 to 150 and 180 tails respectively; grass carp 150 to 300 g/tail, 50 g/tail stocking 40 to 60 and 180 tails respectively; carp 50 to 100 g/tail stocking 300 ~ 400 tails; 50 grams of silver carp / tail stocking of 800 to 1000 tails, totaling 2270 to 2650 tails. With grass carp as the main fish, the stocking rate of 667 m2 net production of 1000 kg is as follows: grass carp 150 to 300 g/tail, 50 g/tail stocking 400 to 450 and 500 fish respectively; carp 100 g/tail stocking 200 to 250 Tail; carp 150 g / tail stocking 80 to 120 tails; carp 50 to 100 g / tail stocking 200 to 300 tail; 50 g white pheasant tail stocking 300 to 400, total 1680 to 2020 tail. The fish species are required to be free of disease and injury. When stocking, they are sterilized with 3% to 4% saline for 5 to 10 minutes. 1. Feeding In winter and early spring, feed a certain amount of cocoon, bran, etc. at noon on sunny days. From March onwards, it will enter full-fledged feeding. Due to the high stocking density, it is best to use artificial compound feeds to meet various nutrients required for rapid growth of fish. The formula: silkworm meal, blood meal, fish meal and other animal protein feed accounted for 8% to 10%, pea, soybean, rapeseed cake and other plant protein feed accounted for 30% to 40%, corn, wheat bran, rice bran and other energy feed accounted for 50 % ~ 60%, calcium, phosphorus and other mineral additives accounted for 2% to 3%. Usually 3 to 5 times a day, each feeding amount is within 1 hour. At the same time, appropriate amount of fresh and delicious green fodder should also be fed, and tender grass, duckweed etc. should be fed. Afterwards, grass, water hyacinth, sweet potato vine, etc. can be fed, and the amount to be fed is the same as that of the day. The compound feed is placed on a fixed food table, and green feed is placed in a food field made of bamboo or rope. 2, top dressing should be based on the type of fertilizer, weather, water temperature and other flexible application organic fertilizer generally every 10 to 15 days 1, every time every 667 meters 2 150 to 250 kg. Fertilizer every 7 to 10 days 1 time, every 667 meters 2 urea 1 ~ 2 kg, superphosphate 2 ~ 3 kg. Organic fertilizer must be decomposed when topdressing. When the water temperature is lower than 30°C, it can be applied more, and vice versa; when the water color is light, it is applied more, and when the water color is thick, it is less applied. 3. In the spring of water management, replace the pool water thoroughly and reduce the water level of the pond appropriately so as to make full use of sunlight to increase the water temperature so that the fish can enter the optimal growth period as soon as possible. Subsequently, the temperature of the water continued to rise and the body of the fish gradually grew. The water level should be raised in stages until the highest point. Whether it is drained or not, depending on the quality of the water, discharge 20% to 30% of the bottom water if necessary. In the summer, it is necessary to increase the amount of pool water to be replaced, and strive not to raise the pond water temperature too high. In autumn, the water level is added to the highest point, and the replacement of the pool water is reduced, and the rate and rate of decline of the water temperature are slowed down in order to strive for a suitable temperature period for the growth of the fish. The time spent on a day's injection and drainage is best arranged at noon or noon.
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