目的 为指导水产养殖户更好地高效利用甜菜碱，提高水产养殖效益。 方法 通过查阅相关文献，对甜菜碱的生物学功能及其在水产养殖中的应用情况进行总结概括。 结果 甜菜碱是一种季胺类生物碱，具有转甲基功能、抗氧化、调节渗透压和改善脂质代谢等作用。在水产养殖生产中，甜菜碱可促进水产动物生长、改善肉品质及提高抗应激能力，现已广泛应用于水产养殖生产中。 结论 甜菜碱作为饲料添加剂在水产养殖中具有显著的作用，但其生物学功能的作用机制及应用仍处于初级阶段，为实现其高效利用还需进一步深入探索和研究。

Objectives Aquaculture farmers were guided to better and efficiently utilize betaine to improve the efficiency of aquaculture. Methods The biological functions of betaine and its application in aquaculture were summarized by reviewing relevant literature. Results Betaine is a quaternary amine alkaloid with functions including transmethylation, antioxidation, regulating osmotic pressure, and improving lipid metabolism. Betaine can promote the growth of aquatic animals, improve meat quality, and enhance stress resistance in the production of aquaculture. It has been widely used in the production of aquaculture. Conclusions Betaine, as a feed additive, plays a significant role in aquaculture, but its biological mechanisms and applications are still in the primary stage. Further exploration and studies are needed to achieve its efficient utilization.