Rice-field shrimp farming in winter is a model for winter shrimp farming using paddy fields to cultivate harvested winter fish ditch. The breeding techniques are introduced as follows:
First, timely stocking. After the paddy field has been harvested, some paddy fields with deep water and good conditions are selected immediately. Excessive silt in the fish ditch will be excavated, and the field will be repaired and strengthened to inject fresh river water. For example, if rape or wheat is to be planted in the paddy field, the water level in the fish ditch should be kept at 1.2 meters; if no rape or wheat is planted, the whole paddy field can be used to grow the shrimp. Two to twenty-five thousand and twenty-five thousand prawns of 2-2.5 cm length can be stocked on the surface of a fish ditch. Restocking time is better at the beginning of December.
Second, cast enough food. Green shrimp can ingest growth throughout the winter, and feeding should be carried out with two feedings. The first 15-20 days after catching and rearing should be used to concentrate the shrimp. The amount of daily feeding can be calculated in the field. Calculate 5% of shrimp body weight; in January-February, feed some bait in moderately warm weather at noon; in March, food intake of green shrimp gradually increases, and daily feeding amount is 3%-5%; 4 The monthly value increased to 6%; in May it is the stage of crustacean spawning and is also the fastest growing season for shrimp. The amount of daily feeding can be increased to 8%, and it can be fed 3-4 times a day, striving for fresh shrimp in May. The body length reaches 5 cm or more in the late period.
Third, strengthen management. In cold weather in January-February, it is necessary to step up field inspections. If ice is found on the water surface, it is necessary to break ice and increase oxygen in time. From 3-5 months, the number of water changes and the amount of water to be replaced are determined based on the concentration of water. When water is injected, it should be selected at about 11 o'clock in the sunny and warm weather, when the temperature of the river and the temperature of the shrimp pond are close to each other. At the same time, shrimp ditch water temperature and water level should be kept stable.
Fourth, timely harvest. Shrimp is usually harvested in the late May. At this time, most of the females whose body length is longer than 5 cm have already hung eggs, and some of them can be reserved for the parent of breeding shrimps, and the others can be sold.
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