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Macrobrachium rosenbergii and freshwater shrimp cross breeding mode
In recent years, the development of Macrobrachium rosenbergii has advanced by leaps and bounds. However, its pond was not fully utilized during the idle period from November of that year to mid-May of the following year. In order to tap the production potential of the shrimp ponds and improve the unit benefits of the ponds, our field has explored a model of circular cross-breeding of Macrobrachium rosenbergii and freshwater shrimps through years of experiments. Using this farming model, the farm harvested 147 kg of Macrobrachium rosenbergii per acre for the whole year, and the production value per mu reached 7,180 yuan. 1. Pond clearing: In the end of April, the pool water is drained and exposed, and a drainage shrimp trap is dug in the pool. At the beginning of May, the first clear pond was made with pentachlorophenol, and after 3 days, the second clear pond was treated with lime and trichlorfon. After 5 days, the pond was again drained and exposed for drying. One week before stocking, the shrimps were filtered with 80-100 mesh nylon gauze, and 100-300 kilograms of livestock manure was applied per acre to cultivate plankton so that there was ample palatability feed after the shrimp ponds. II. Stocking and seedling management of Macrobrachium rosenbergii In mid-May, when the pond water temperature reaches 20°C or above, clear weather should be used to plant seedlings in good time. A total of 15,000 Macrobrachium rosenbergii is stocked per acre. After 25 days of seedling, the seedling period is managed. Milk and powder can be fed daily. Soymilk is mainly used in the early stage, powder and Fish Meal are fed in the later stage, and the daily investment is 4 times. The daily dosage is 0.25-per million. 0.75 kg. Third, holding egg shrimp stocking and shrimp management Macrobrachium rosenberga stocking a month later, generally can reach 1.5 cm or more, this time can be held in the shrimp pond 0.5 acres per acre holding eggs, shrimp breeding. From the third day after the release of the eggs, shrimps were fed with soy milk, 1.5 kg of soymilk per acre, and they were fed continuously for 3-5 days. Afterwards, the residual bait of Macrobrachium rosenbergii is a good food for the shrimp, and there is no need for supplementary feeding. IV. Key measures for post-production management Macrobrachium rosenbergii has gradually transferred shrimp feed since it was seeded. Three times daily, 300 kg of feed will be fed per acre throughout the year. Managing good water quality, preventing and controlling diseases, and preventing floating heads are another key aspect of raising shrimp in ponds. Shrimp pools must constantly regulate water quality so that they are “fat, live, tender and coolâ€. In the early stage, water was mainly used, and a small amount of water was changed in the middle period, and the water was changed frequently during the later period. The water quality was found to be changed in time to prevent the hot weather from floating. Add water to change the water to use a gauze filter to prevent the enemy from entering the pond. V. Harvest of Macrobrachium praecox and retention of green shrimp In late September, when Macrobrachium rosenbergii grew to 60-80 kg per kg, it began to be listed one after another. At the beginning of the month, the net was caught in the clear pond. After catching the net, the water should be returned in time, and 10 kilograms of fresh shrimp can be kept in the pool for aquaculture every other acre. The shrimp feed should be thrown every other day and 0.5-1 kilogram per day for each mu. In late December, when the water temperature is below 5°C, the pond will use 300kg of cow dung per acre to make the shrimp safe for the winter. When the water temperature rises to 10°C in the next year, it starts to feed and the daily amount accounts for 2% of the shrimp weight. According to the market conditions, we will catch up with small businesses and market them in batches, until the dry pool in the late Qing Dynasty. Each acre chooses to stay 0.5-1 kg of small green shrimp as a species of shrimp and begin the second year cycle.