Five Key Points of the Nutritional Program for River Crab Farming

1. Protecting the liver. The liver is an important metabolic organ of the river crab, serving functions such as detoxification, blood production and oxygen transport, secretion of digestive enzymes, and absorption of nutrients. As the river crab molts and grows, the load on the liver increases, making it prone to pathological changes, which leads to a decline in constitution and immunity, thereby triggering bacterial diseases. Therefore, for routine prevention, regularly administer orally “Pinggan Bao + Yingyang Kuaixian + yeast cell wall polysaccharide” or “Ganlikang + Yingyang Kuaixian + yeast cell wall polysaccharide”.

2. Aiding digestion. The river crab is a poikilothermic animal that fears heat but not cold, and its body temperature is often close to the farming water temperature of 20~25°C. This temperature is lower than the optimal temperature of 35~40°C for the digestive enzymes in the river crab's body, so endogenous enzymes are insufficient; moreover, the river crab has a large stomach and a short digestive tract, so overeating most easily causes indigestion. For routine prevention of enteritis diseases, regularly administer orally “Xiaoshi Jianwei Bao + Yingyang Kuaixian + Geli'an”. 3. Calcium supplementation. The river crab's ability to absorb calcium ions in the water body is stronger than its ability to absorb calcium from compound feed. When the river crab molts, it must absorb the calcium ions on the shell into its body (which is why the crab shell appears to turn yellow during the molting period), and it can only molt smoothly when the total amount of calcium in the shell equals the total amount of calcium in the body. After molting, the “soft crab” must fully absorb water, especially calcium and phosphorus from the water body, to promote the hardening of its shell. Therefore, one week before molting, regularly administer orally “AD calcium + Yingyang Kuaixian” to supplement energy and nutrition and enhance vitality. At the peak of molting, splash ”ribonucleic acid calcium + Jiedu Yingjiling” to promote shell hardening and recovery. 4. Promoting growth and fattening. As the saying goes, “July and August grow the shell, September and October grow the fat.” In the high-temperature summer season, river crabs are frequently active and their appetite increases greatly, making it a critical period for river crab growth. River crabs are fed “fine at both ends and coarse in the middle.” In the later stage, feed fine feed to fatten and promote fattening, and feed enough. However, the river crab itself has a large stomach and a short intestine and is greedy, so its ability to digest high-protein feed is relatively poor. In summer, high temperatures also make bait prone to spoilage. Therefore, in the later stage of feeding, regularly add the product that promotes the absorption of fat and protein, “Zhizhuang Bao”. 5. AD calcium, nutritional binder. Generally, farmers like to feed dry feed directly, but with dry feed feeding, there will always be a small amount of powder, and the palatability is poor. The powder scattered in the water both pollutes the water quality and wastes feed, and may even sink to the bottom of the pond, spoiling the substrate and water quality. Moreover, dry feed easily absorbs water, especially in ponds with poor water quality. River crabs may develop diseases after ingesting bait carrying bacteria, viruses, or high nitrite. Therefore, when feeding, add a small amount of clean water to mix the feed before feeding, to reduce risk. It is best to appropriately mix an environmentally friendly nutritional binder into the feed and feed it after coating the feed, which can not only attract feeding but also enhance nutritional digestion, and can further prevent bottom sludge seepage from contaminating the feed. AD calcium is a new generation of emulsified calcium. It is not only rich in highly active ionic calcium, vitamin A, D and other nutrients, but also supplements calcium quickly, has a high absorption rate, and hardens the shell rapidly. It also has good viscosity and can dissolve in water in any proportion, maintaining viscosity while not causing secondary pollution to water quality and substrate. It is perhaps the best binding product currently available.