Last year, Zhang, a fish farmer in Yifeng Town, Yancheng City, Jiangsu Province, used a first-year-old fish pond to raise ducks. During the rearing process, they discovered that fish fry below 4 cm did not move quickly. As a result, ducks ate too much because of water. Ducks are caused by omnivorous waterfowl and partial eclipsed animal feeds. There are also specialized ducks in the town where ducks use polyculture in paddy fields. It is not worth the candle. This is due to the fact that the ditch is shallow and can only be used to raise fry and cultivate fish. When feeding, it was harmed by ducks. At the same time, feeding by ducks also damaged the growth of rice plants and affected rice production. Practice has proved that ducks in fishery ponds are fish and duck polyculture using adult fish ponds and second-instar fingerling pools. Generally without increasing the amount of feed and fertilizer, every 667 square meters of water can produce 100 to 250 kilograms of fish, increase production by 15% to 35%, and can also produce duck eggs and duck meat. Its feeding and management techniques are as follows. 1. Choose the right surface. The surface of the water is generally selected from an adult pond with an area of ​​667 square meters or more and a water depth of 1.5-2 meters or more, and a suitable river ditch, a small lake, or a reservoir. Slope protection shall be provided for sand rakes, loose soil ridges and duck ponds on newly excavated fish ponds. In addition, the first-year fish ponds are generally not suitable for ducks, and rice fields are not suitable for polyculture. 2. Select the appropriate method. At present, there are mainly three ways to implement comprehensive management of fish and ducks: First, grazing. That is, the ducks are scattered on the surface of ponds or lakes and are returned to the duck shed in the evening. This method is conducive to large-surface fish breeding, but also can save a duck feed, but the effect of increasing the yield of fish is not. The second is the duck outside the pond. That is, a duck canopy is built near the fishing pond, and a cement activity site and activity pool are set up. The duck manure and residual feed at the activity site are washed into the fish pond every day. This approach facilitates management in duck clusters, but it does not give full play to the symbiotic benefits of fish and ducks. The third is fish and duck polyculture. That is, a duck shed is built on the dike of the fishing pond, and a part of the pool pond is used as a playground to store the ducks directly on the fishing pond. In this way, the ecological effects of symbiosis and mutual benefit between fish and ducks can be brought into full play. Farmers can choose the appropriate mode of operation according to local conditions and can maximize their effectiveness. 3. Make a reasonable match. Duck ponds generally use 100 to 150 ducks per 667 square meters. If more than 200 ducks are to be fed, fish-feeding and omnivorous fishes, such as eel, cockroach, tilapia, or pupa, cockroach, etc., should be dominant, and grasses, cockroaches, or herrings should not be used. In addition, we must pay attention to changing water and oxygen. The number of ducks per 667 m2 of fish ponds should not exceed 250, otherwise fish production will decline significantly. With an annual output of 40-50 kilograms per duck, the duck pond will be increased by 4,800-7,500 kilograms per 667 square meters compared to non-duck, effectively fertilize the pond water, and reproduce a large number of plankton, which will grow barramundi and mackerel. Provide enough feed. Duck ponds can be bred, squid-based, per 667 square meters can be put 50 ~ 75 kg of fish, 1000 ~ 1500 tail. In order to raise grasses and herrings, 75 to 1500 kilograms and 1,000 to 1,500 tails are placed on every 6,667 square meters. Well-fed, 667 square meters, net fish production up to 400 kilograms or more. 4. Strengthen feeding management. In order to facilitate the management of the duck cluster, a part of the fishing pond can be used as a duck activity pool by using old mesh, screens, and other materials. It is better to raise 2 to 4 ducks per square meter of water. The mesh height is 40 to 50 on the surface of the water. Centimeters so that the fish can come in and out freely. Every morning and evening, ducks are fed at the Ikeji event venue. After the ducks enter the shed in the early evening, the duck droppings and residual food are swept into the pool. In the morning, the ducks were released from the shed and the duck droppings in the shed were swept into the pool after the eggs were quailed. In summer, the ducks have a large amount of dejecta and the water quality is too fat. It is necessary to add new water and reduce the amount of fertilizer. (Wang Shulin)
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