Haijing Liu graduated from Neijiang Normal University with a bachelor's degree in biotechnology. His research focuses on antibiotic-free culture technology and the application of medicinal plant extracts as functional ingredients in fish feed. He is currently studying for a master's degree in fisheries at Dalian Ocean University, researching aquatic animal nutrition and feed. He was interested in exploring the effects of feed water-soluble vitamin levels on sea urchin growth, gonadal texture, and collagen content and synthesis.