There are many kinds of fry breeding methods. According to the production practice experience, there are mainly the following methods. Soymilk cultivation method This is a traditional method of cultivating fish fry. Usually, the first time the fish is put into the pond after 5 hours to 6 hours in the lower pond. Soybean milk production method is: first soaked in water soaked in water at a water temperature of 25 °C ~ 30 °C about soaked for about 6 hours to 7 hours, to the gap between the Douban fullness prevail, soaking time is too long or insufficient will affect the quality of milk . Generally 1 kg soybeans can be refined 15 kg, 1 kg soybean cake can be refined 10 kg to 12 kg. When grinding, add soybeans and water at the same time. Do not grind them and then add diluted water to avoid precipitation. Milled soybean milk should be fed in time to prevent deterioration. Feed 2 to 3 times a day, about 9:00 am and 3 pm. Within 10 days after fry feeding, 1.5kg to 2kg soybeans or 2kg to 2.5kg soybean cake are fed every mu. After 10 days, increase according to the color of the water and the growth of the fish. General development of 10,000 summer flowers need 6 kilograms to 7.5 kilograms of soybeans or 8 kilograms of soybean cake.
Organic fertilizer cultivation method This method is to use organic fertilizer in the fry pool to cultivate plankton, and provide rich food for fry. There are three main types. The first is composting of green grass. In the first 5 days to 10 days before the fish fry, 200 to 400 kilograms of grass are placed per mu, which are piled up on the edge of the pool and cultivate plankton after rotting. After the fry of the fish pond, 6 to 8 days after the grass, 150 kg to 200 kg of green grass was added as top dressing. The second is the method of straw culture. The use of water peanuts, water lettuce and other high-yield aquatic plants labeled as grass pulp to raise fry, the effect is very good. Feeding is done twice a day at Quanchiposa. Every mu of grass pulp 50 kg to 70 kg per day, depending on the number of specific colors. The fry can directly ingest part of the pomace particles in the straw, and the rest of the straw pulp quickly decomposes and fertilizes in the water. The key to improving the utilization rate of straw pulp is to play fine, because water peanuts contain saponin, use 2% ~ 5% of salt when used, can only feed after rotating for a few hours, and use a small quantity and more evenly spilled method. The third is manure breeding method. Before the fish fry are not applied to the pond, the basal fertilizer is first applied to fertilize the water. After the fry are in the pond, the amount of fertilizer is determined according to the water quality, the weather, the water temperature and the growth of the fry. Generally, 50 kg to 70 kg of fermented manure is applied per mu. Quanchiposa.
Fertilizer cultivation method commonly used nitrogen fertilizers are ammonium sulfate, urea, ammonium nitrate and ammonium bicarbonate; phosphate fertilizers such as superphosphate. In the first 20 days before the fish ponds under the first base fertilizer, ammonium sulfate 3 kg to 5 kg per mu, superphosphate 2.5 kg. The method is to directly sprinkle the chemical fertilizer in the pond. After the fish is under the pond, the amount of fertilizer should be determined according to the water quality, the weather, and the growth and activity of the fish. For a small amount of ground handling, generally 1.5 kg of ammonium sulfate and 0.25 kg of superphosphate are applied every 2 to 3 days. Fertilizer should be applied fertilizer dissolved in water after the whole pool are spilled to prevent the fish fry pellet fertilizer mistakenly swallowed.
The mixed cultivation method adopts the mixed cultivation method of fertilizing and feeding soybean milk and can exert various characteristics of bait fertilizer to make up for the deficiency of single fertilization. The method is: a. fish seedlings before the pond 3 days to 4 days per acre applied organic fertilizer 250 kg to 300 kg, the cultivation of rotifers and other natural food, such as water quality can not be fertilizer can be part of the fertilizer, so that the fish after the pond has enough delicious The bait; b. The next few days after the pond is the key moment to raise the survival rate of the seedlings. It is best to feed some fine feeds. Each kilogram can feed 1 kilogram to 2 kilograms of soybean milk every day to assist the lack of natural food. After every 3 days to 5 days, fertilize 150 to 200 kg of decomposed manure per acre. c. Plankton in fry pool, especially plankton which can be digested and used by fry, grows with fry. Demand for supply, especially grass carp, herring, and carp seedlings, after feeding for 5 days to 7 days, the amount of large plankton in the pool can hardly meet the needs. At this time, besides the pulp, it is better to use thicker bean dregs or bean cake residue. Ping and so on stacked in the shallow water around the pond for feeding fry, so as not to cause race horse disease.
The above four methods can be carried out separately, or they can be mixed or cross-processed. They must be adapted to local conditions and applied flexibly according to the bait conditions.
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