Huang Yu, a highly profitable crop, has attracted many farmers due to its high market value. However, numerous failures have occurred due to improper techniques. These issues mainly arise from the following aspects.
First, farmers often purchase seeds without proper knowledge. In China, artificial propagation of Huang Yu is still not mature enough for mass production. Many so-called "artificially bred" or "high-quality" seedlings sold to farmers are actually wild-collected. The handling and transportation processes are usually unscientific, leading to a mortality rate as high as 90% to 100%. Therefore, it's crucial to be cautious when buying seeds. It's recommended to source high-quality seeds locally from reliable suppliers.
Second, variety mismatch is another common issue. Huang Yu comes in different types based on appearance—deep yellow spots, red spots, light yellow spots, and fine green spots. Among these, only the first two varieties grow quickly and can yield good economic returns through artificial breeding.
Third, size mixing in the same pool or cage leads to problems. When young and large individuals are kept together, smaller ones often struggle to compete for food, weakening over time or even dying. If food is scarce, they may start cannibalizing each other. Although this might lead to faster growth of some individuals, overall yield remains low.
Fourth, water depth is also a critical factor. Huang Yu cannot float freely in different water layers and must surface to breathe. If the water is too deep, they have to swim up frequently, which drains their energy and affects normal growth. The ideal water depth should range between 5 to 20 cm. Cages should be filled with water and covered with aquatic plants to create a suitable habitat and breathing environment.
Fifth, improper use of manure can harm water quality and cause diseases, especially in small bodies of water like Dianchi Lake.
Sixth, neglecting the cultivation of aquatic plants is another mistake. Aquatic grass helps regulate temperature, purify water, and provide shelter for Huang Yu. Without it, the ecological environment becomes poor, making it difficult to achieve high yields and profits.
Seventh, improper feeding practices can lead to serious issues. Some farmers feed Huang Yu with wheat bran, vegetable cakes, bean dregs, rice, or vegetables, but this diet lacks sufficient nutrition. As a result, the fish become weak and eventually die. Since Huang Yu is a carnivorous species, it should be fed animal-based feeds or high-quality compound feed.
Lastly, frequent changes in feed can cause stress. Huang Yu tends to eat the same type of food consistently. Sudden changes can lead to refusal to eat, affecting their health. If a change is necessary, it should be done gradually by reducing the old feed while increasing the new one step by step.
By addressing these issues, farmers can significantly improve their success rate in cultivating Huang Yu.
Pharmaceutical Grade
Pharmaceutical grade is the classification of use, not purity. Pharmaceutical grade is a kind of reagent used in medicine respectively. The purity of pharmaceutical grade may not be higher than that of chemical grade, but the key point is that the reagent can be used in medicine first, without harm to human health; Secondly, it should not contain impurities harmful to human body. Even some impurities that are difficult to remove must be lower than the national standard for the residue of the substance in medicine or food. Some pharmaceutical grade reagents may not have very high purity, many of them only reach industrial purity, but the harmful impurities must be very low or none.
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