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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 mainly winter and spring, December and next year every year in March to April is the best stocking season, cold, freezing generally should not be stocked, so as to avoid frostbite, influence Survival rate.
Fourth, the scientific release of crab species should be based on the amount of natural food in the waters and economic strength. The 200/kg to 300/kg crab species are stocked at a density of 400/mu to 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 or 3 times until the young crab is fully absorbed. Re-enable the environment.
Fifth, feeding and managing large areas of water plants are abundant, generally do not need to feed feed in the early period, from June to September is a vigorous period of crab growth, in order to continue and protect aquatic plants, this time should be fed in time snails, river clams, fish and shrimp meat and cereals , beans, pumpkin silk and so on. Usually two times a day feeding, 8 am to 9 o'clock and 17 o'clock to 18 o'clock each feeding 1, the daily feeding amount should be 5% to 7% of crab 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 avoid deterioration of the water. 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.
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 genital migrating fishing, usually using cages and ecstasy array fixed arrest, the effect is good.
Selenium
is an indispensable trace element to maintain the normal function of
the human body. Selenium deficiency in the human body can lead to
various diseases. Modern scientific research
proves that selenium has anti-oxidation, enhances human immunity,
effectively removes harmful garbage, promotes human health, and delays
aging.
In winter and spring, large-surface water-reserve crabs have the advantages of smooth water flow, adequate dissolved oxygen, and abundant natural food, which can significantly reduce production costs and improve the breeding efficiency. Now with my farm years of breeding experience, the technical points are described as follows: