1, the food should be mixed variety of crab food, partial animal feed, and bulimia, feed on the bait. It is necessary to satisfy the nutrient demand of river crabs, speed up the growth of oyster shells, and also to reduce the cost of breeding and raise the breeding efficiency. Local conditions can be adopted to solve the sources of bait. First, transplant enough crab plants to cover more than 60%. Aquatic grass is not only a botanical bait for eating crabs, but also can purify the water quality. Crab ponds and aquatic grasses are also conducive to the growth and reproduction of natural food organisms such as small trash fish, shrimps and snails, and crab pond water plants are mainly submerged plants. Floating plants and emerged plants are supplemented. The second is to put snails to allow them to reproduce naturally, for crabs to feed freely. Snail meat is rich in nutrients, high fat content, good taste, crabs like to eat. Crab pond put snails. Not only does it provide high-quality natural foods to reduce the cost of farming, but it also improves crab quality. The third is to actively promote the use of pellet feed to raise crabs. According to the different developmental stages of crabs on the nutritional needs. According to a certain ratio of animal and vegetable diets, it can be used as a granular food with complete nutrition, good palatability, high protein content, long stability in water, and high utilization rate. The use of granular food to raise crabs, can reduce water pollution, reduce disease, reduce feed coefficient, promote rapid growth of crab shells, especially autumn feed pellet feed, can promote rapid fattening crab weight gain effect is particularly obvious, the fourth is based on local conditions. Open up food sources. Animal diets include small trash fish, shrimp snails, silkworm gizzard pig blood, livestock and poultry organs, frog meat, etc., plant foods are wheat, bean cakes, aquatic plants, etc., and the fifth is to regularly add shell powder, poultry egg shells, Fishmeal, bone meal, etc. Increasing the calcium and iron content in the diet is beneficial to the crab shell. Sixth, timely application of phosphate fertilizers, potassium fertilizers to increase phosphorus, potassium and other elements in the water to meet the nutrient needs of various trace elements in river crabs. 2 Feeding should be scientific 2.1 Animal and plant sex should be properly matched with the crab diet. In the bait mix, feed is fed throughout the year, animal feed accounts for 60%, and plant feed accounts for 40%. 2.2 According to the general principle of Li Shu's science and technology at the time of fishing, "two fine and medium green. The spring and autumn seasons are mainly based on animal foods and supplemented with plant foods. The summer foods are mainly based on plant foods. 2.3 According to the living habits of crabs. The life style of bastard crabs should be categorized as bailing and feeding at night and the amount of bait should account for 70% of the amount of bait throughout the day. 2.4 The bait should be palatable. The bait size should be consistent with crab size. Suitable for large individuals should be cut into chunks, plant food should be made into a group.2.5 Change the deep water area for shallow water feeding bait put in shallow water areas with water plants. The distribution should be uniform, and adhere to the four to determine the vote Bait principle: 2.6 Changing raw food into cooked food, feeding various raw grains to be fully soaked, cooked and then fed is conducive to digestion and absorption by crabs. To promote crabs during the growing period, on the other hand, to promote crabs to synchronize shells, reduce the probability of killing each other, and second, to prevent crab disease, the bait should be fresh. Pacancy, can not be turned into a moldy, rotten, and spoiled Remove in time Avoid corruption of bad water, and regularly soak the feed with 30% salt water, 30 to 40 minutes each time, and then disinfect and sterilize.Thirdly, in the prevention of crab disease and crab disease, add some disease-preventing medicines to the bait to prevent and control the roach disease. The combination of rotten limb disease, rot shell disease, shivering disease, and oral and external use is more effective.Four is the combination of scientific investment and water quality regulation, regular disinfection, pay attention to this year due to the higher ammonium nitrogen, it is best not to use lime, and Bleach disinfection can be used with some water purifying agent or water body disinfectant.
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