Winter crab breeding technique

Winter crab breeding technique

First, stocking ready to choose fresh water, sunny, rich aquatic plants, snails more water areas, where there are few plants can be artificially planted or part of the water plants to make up, so that the river crab can get enough animal and vegetable food, is conducive to meet And promote the growth of crabs. At the same time, nets and wooden stakes are used to enclose double layers of aquaculture waters, and it is advisable that the height be higher than the average annual water level by more than 1 meter. Before juvenile crabs are stocked, wild fish in the waters should also be removed to reduce natural enemies. Second, the choice of seedling breeding efficiency is good or bad, seedling is essential. First of all, we should purchase young crabs with neat specifications, strong physique, and no disease or injury. From the results of breeding for many years, the ecological soil pond nursery is more suitable for natural stocking than the industrial cement pool nursery, especially for large water surface stocking. Third, stocking time Water surface stocking should be based on winter and spring bloom, the annual December and March next year - April is the best stocking season, cold, freezing is generally not suitable for stocking, in order to avoid frostbite, influence Survival rate. 4. Scientifically put in 200/kg-300/kg crab species at a density of 400/mu-600/mu. Areas with large areas, adequate feed, good water quality, and guaranteed funds can also be appropriately increased, but they must not exceed the natural feeding capacity of the water area. Before stocking, the crabs should be put on a temporary basis and the range should be larger. If the dehydration time of purchased crab species is longer, it should be soaked in water for 1 minute to 2 minutes together with the net bag, and then removed and placed for 3 minutes to 5 minutes. This is repeated 2 times to 3 times until the young crab is fully absorbed and adapted. Re-enable the environment. Fifth, feeding and managing large areas of water plants rich, generally do not have to feed feed in the early period, June-September is a vigorous period of crab growth, for the continuation and protection of aquatic plants, this time should be fed in time snails, river clams, fish and meat and cereals , beans, pumpkin silk and so on. Usually two times a day feeding, 8 am -9 o'clock and 17 o'clock - 18 o'clock each feeding 1, the daily feeding amount should be calculated by 5% -7% of crab body weight. It should be fed in the deep water area of ​​aquatic plants in the morning and in the shallow water area of ​​aquatic plants in the afternoon. In the meantime, the aquatic plants that have been bitten off by the crabs should be removed in time to prevent them from spoiling the water quality. Usually, the combination of quicklime and mixed baits for internal medicine is regularly used to minimize the occurrence of diseases. Common internal medicines include norfloxacin, heparin, and FRC vitality sources. Sixth, crabs to catch large water surface cultured crabs are different from ponds to raise crabs, should be timely fishing. Generally selected in early September, catch crabs before the natural reproduction of the upstream fishing, usually using cages and ecstasy array fixed arrest, the effect is good.

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