In the field of amino acid application in livestock and poultry, there are still many areas that need improvement, but the technology is gradually maturing. However, the research on amino acids in aquatic products remains limited. As China is the world's largest producer of aquatic products, effectively utilizing amino acids in aquaculture holds great significance. This seminar was fortunate to have Dr. Gao Wen, Manager of the Aquatic Nutrition Program at Evonik Degussa (China) Investment Co., Ltd., deliver a keynote speech titled "Progress in the Study of Methionine in Fish and Shrimp Feed." The content presented below was compiled from Dr. Gao’s lecture and has not been verified by me.
The use of amino acids in aquaculture feed has become an essential strategy for improving feed efficiency and sustainability. Despite the high cost of aquatic feed, adding exogenous amino acids has proven to be an effective solution. Historical data shows that the use of fishmeal in aquafeed increased from 10% in 1988 to 35% in 2000, and its price rose more than fivefold between 1988 and 2012. To reduce costs and meet sustainable development goals, modern salmon feed has significantly decreased the use of fishmeal. Two main approaches are used to compensate for this reduction: either by directly adding plant-based protein sources or by incorporating synthesized amino acids. Among these, the direct addition of crystalline amino acids offers significant advantages under the "amino acid balance principle."
Methionine, in particular, has shown great potential as a substitute for fishmeal in aquaculture feed. Experimental studies conducted on various species, including salmon, southern Chinese tilapia, northern squid, and South American shrimp, confirmed the substitution value of methionine in conventional feeds. These experiments provided specific substitution ratios for each type of feed. The benefits of using methionine instead of fishmeal are twofold: first, it can help reduce feed costs while maintaining the same level of growth performance; second, it can significantly enhance the growth performance of aquatic species when used within the same cost range.
This approach not only supports economic efficiency but also promotes environmental sustainability by reducing reliance on fishmeal, which is a finite resource. With continued research and innovation, the role of amino acids like methionine in aquaculture will likely expand further, offering promising solutions for the future of the industry.
Photo: Evonik Degussa (China) Investment Co., Ltd. - Dr. Gao Wen
lithium batteries are a class of batteries made of lithium metal or lithium alloy as positive/negative electrode materials and using a non-aqueous electrolyte solution. lithium batteries can be broadly divided into two categories: lithium metal batteries and lithium ion batteries.
Lithium metal batteries: These batteries contain lithium in the metallic state and are usually non-rechargeable. Due to the very active chemical properties of lithium metal, its processing, preservation and use have very high environmental requirements.
Lithium-ion batteries: These batteries do not contain lithium in the metallic state and can be recharged. Lithium-ion batteries mainly rely on the movement of lithium ions between the positive and negative electrodes to work, and when charging, lithium ions are removed from the positive electrode and embedded into the negative electrode through the electrolyte; The opposite is true for electrical discharge. Lithium-ion batteries have a voltage range of 2.8V to 4.2V, typical voltage is 3.7V, lower than 2.8V or higher than 4.2V will cause damage to the battery risk.
The invention of the lithium battery can be traced back to 1912, by Gilbert N. Lewis proposed and studied lithium metal batteries. Lithium-ion batteries, on the other hand, were started in the 1970s by M. S. Whittingham. With the development of science and technology, lithium battery has become the mainstream, especially in portable electronic equipment widely used.
Rechargeable Lithium Battery, Li-ion Battery, 18650 Lithium Battery
Guangdong Dp Co., Ltd. , https://www.dp-light.com