Viral covert mortality disease (VCMD) in cultured shrimp is caused by covert mortality nodavirus (CMNV). The infected shrimp mainly die successively in the deep-water areas at the bottom of farming ponds. which is difficult to observe; as such. the term "covert mortality disease" was coined by local farmers. https://herbsdailyes.shop/product-category/sugar-and-salt-substitutes/