Why does crab compound premix feed significantly improve river crab survival rates?
Publish Time: 2025-09-29
River crab farming is a vital component of my country's freshwater aquaculture industry, and its economic benefits and quality are directly linked to farmers' profits. However, traditional aquaculture models often struggle to ensure survival due to nutritional imbalances, deteriorating water quality, and frequent diseases. Mortality is particularly high during critical stages such as juvenile rearing, molting, and high temperatures. In recent years, with the advancement of aquatic nutrition, the widespread use of crab compound premix feed has significantly improved river crab survival rates. This is the result of the synergistic effects of scientific formulations, precision nutrition, and biotechnology.1. Comprehensive and balanced nutrition to meet key growth needsRiver crabs have varying requirements for nutrients such as protein, fat, vitamins, and minerals at different stages of growth. Juvenile crabs require high levels of protein to promote tissue development, while large amounts of calcium and phosphorus are needed to support shell hardening during molting. A moderate amount of fat is needed to accumulate roe and roe during the fattening period. Traditional feeding of small fish, snails, or single grains often results in incomplete or unbalanced nutrition, easily leading to nutrient deficiencies or excesses. Crab compound premix feed, however, incorporates a scientifically formulated blend of plant and animal protein, energy sources, and micronutrients tailored to the crab's physiological characteristics. This ensures comprehensive and balanced nutritional support at every stage, fundamentally strengthening its health and reducing mortality from malnutrition.2. Strengthening the Immune System and Improving Disease ResistancePremix feed incorporates a variety of immune enhancers, such as β-glucan, yeast polysaccharide, vitamin C, vitamin E, and organic selenium. These ingredients activate the crab's nonspecific immune system, enhance the phagocytic capacity of blood cells, and increase the activity of lysozyme and antioxidant enzymes. When attacked by pathogens, parasites, or environmental stressors, crabs are more quickly able to activate their defense mechanisms, reducing the risk of infection. Crabs fed a high-quality premix feed regularly exhibit vibrant coloration, increased vitality, and enhanced disease resistance, significantly reducing the incidence of common diseases such as bacterial enteritis, black gill disease, and limb rot, thereby improving survival rates.3. Promote smooth molting and reduce mortality during moltingMolting is a critical stage in crab growth and one of the periods with the highest mortality. Deficiencies in calcium, phosphorus, vitamin D3, and chitin precursors can lead to molting difficulties, soft shells, deformities, and even death. Crab compound premix feed is specially formulated with a fortified mineral profile, using soluble calcium sources and organic trace elements to ensure efficient absorption and utilization by crabs. Furthermore, the feed contains molting hormone analogs or natural molting-promoting ingredients to help regulate endocrine function, promote synchronized molting, shorten the critical period, and significantly reduce the risk of stuck shells and cannibalism.4. Improve intestinal health and reduce digestive system diseasesPremix feed is produced using an extrusion process, resulting in a stable granule structure, strong solubility in water, and resistance to disintegration, thus preventing water contamination. Furthermore, the extrusion process fully gelatinizes starch and denatures proteins, making it easier for crabs to digest and absorb. Some high-end feeds also contain probiotics and prebiotics to regulate the intestinal microbiome, inhibit the growth of harmful bacteria, and prevent enteritis and white stool disease. A healthy digestive system means higher feed utilization and greater stress tolerance, indirectly improving survival rates.5. Reduce environmental pollution and optimize aquaculture water qualityTraditional feeding methods often cause high levels of ammonia, nitrogen, and nitrite in the water, leading to hypoxia and poisoning due to excessive bait residue and rapid dissolution. Premixed feed, on the other hand, is highly stable and does not disintegrate within two hours of entry into the water, resulting in high feeding rates and minimal residual feed. Furthermore, a precise protein ratio reduces nitrogen emissions and mitigates the risk of eutrophication. Good water quality is essential for the healthy growth of river crabs. Water with stable dissolved oxygen and low toxin levels significantly reduces mass mortality due to hypoxia and poisoning.6. Enhance stress tolerance and cope with extreme climatesRiver crabs are prone to stress reactions under stressful conditions such as high temperatures, heavy rain, and large diurnal temperature swings, leading to decreased immunity, reduced food intake, and even death. The vitamin C, B vitamins, and electrolytes added to premixed feed can effectively alleviate stress reactions and maintain physiological balance. Furthermore, a stable feed supply prevents food scrambles and self-harm caused by food shortages.Crab compound premix feed, through its scientific formula, precise nutrition, and functional additives, significantly reduces the risk of crab mortality during aquaculture by enhancing physical fitness, boosting immunity, ensuring molting, improving intestinal function, and optimizing water quality. It's more than just "feed"; it's "a guarantee of health." For modern, ecologically sound, intensive crab farming, selecting high-quality premix feed is a key measure to improve survival rates, yields, and economic returns.
