Five Key Points of the Nutritional Plan for River Crab Farming
1. Liver protection
The liver is an important metabolic organ of the river crab, serving functions such as detoxification, blood production and oxygen carrying, 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 lesions, which leads to a decline in constitution and immunity, thereby triggering bacterial diseases. Therefore, for routine prevention, regularly feed orally “Pingganbao + Nutrition Express + Yeast Cell Wall Polysaccharide” or “Ganlikang + Nutrition Express + 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 and disease, regularly feed orally “Xiaoshi Jianweibao + Nutrition Express + Geli'an”.
3. Calcium supplementation
The river crab's ability to absorb calcium ions from 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 from its 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 feed orally “AD Calcium + Nutrition Express” 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, “shells grow in the seventh and eighth months, fat is put on in the ninth and tenth months.” 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 crab feeding follows “fine at both ends, coarse in the middle.” In the later stage, feed fine feed to fatten and promote fattening, and feed sufficient material. 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, bait is also prone to spoilage. Therefore, in the later stage of feeding, regularly add a product that promotes the absorption of fat and protein, “Zhizhuangbao.”
5. AD Calcium, nutritional binder
Generally, farmers like to feed dry feed directly, but when dry feed is fed, there will always be a small amount of powder, and the palatability is poor. The powder disperses in the water, both polluting the water quality and wasting feed, and may even sink to the bottom of the pond, spoiling the bottom quality and water quality. Moreover, dry feed easily absorbs water, especially in ponds with relatively poor water quality. After the river crab ingests bait that may carry bacteria, viruses, or high nitrite levels, it can trigger disease. Therefore, when feeding, add a small amount of clean water to mix the feed before feeding, to reduce risk. It is best to properly 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 the bottom silt seepage water 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 provides fast calcium supplementation, high absorption rate, and rapid shell hardening. It also has good viscosity and can dissolve in water in any proportion. While maintaining viscosity, it will not cause secondary pollution to water quality and bottom quality. It may be the best binding product currently available.