We would like to thank the captains, crews, researchers, and staff who took part in the cruises. In particular, we would like to thank Keiko Yamada for her assistance with the stable isotope analysis. We state that there is no conflict of interest, and the Japanese government granted authorization for all of observations in accordance with the Japanese legislation. This work has been funded by a research and assessment program for fisheries resources from the Fisheries Agency of Japan, grants from the Japan Fisheries Research and Education Agency, and Japan Society for the Promotion of Science grants for Taketoshi Kodama, Yosuke Igeta, and Yoichi Kogure (19K06198).