Satoshi Nagai is currently a chief scientist at the Japan Fisheries Research and Education in Japan. He has studied molecular detection and population genetics, targeting mainly HAB species. In recent 10 years, he has had research projects to evaluate eukaryotic biodiversity utilizing metabarcoding techniques among different marine ecosystems, i.e., sea ice, aquaculture and fish grounds, coral reef, macroalgal seedbed ecosystems from the northernmost to the southernmost area of Japan (from coastal waters to offshore and deep-sea). The study area has recently expanded worldwide by international collaborations in Asian and Chilean coastal waters, Black Sea and Baltic Sea.