http://swrc.ontoware.org/ontology#Article Marine ecosystem monitoring in the sea-ice region of Lützow-Holm Bay, off Syowa Station, during the icebreaker Shirase cruise of the 60th Japanese Antarctic Research Expedition en Marine ecosystem monitoring As part of the monitoring program of the Japanese Antarctic Research Expedition (JARE), marine ecosystem survey in the sea-ice region of Lützow-Holm Bay, off Syowa Station, has been routinely carried out since JARE-52 (2010/11 season) to understand biological production and mechanisms in relation to sea-ice. Water temperature, salinity, chlorophyll-a concentration, macro-nutrients (nitrate, nitrite, phosphate, and silicate), and zooplankton data were collected at six stations in various sea-ice environments: fast-ice, pack-ice, and ice-free open ocean. The use of an “ice-fence” protected observation equipment (e.g., plankton nets and CTDs) from damage due to sea-ice. This report provides the data obtained during the icebreaker Shirase cruise of the 60th Japanese Antarctic Research Expedition in the 2018/19 season, and is the third report for the marine ecosystem monitoring in the sea-ice region from the first report of the 2016/17 season in this journal. Polar Data Journal 9 1-13 2025-04 National Institute of Polar Research 2432-6771 https://doi.org/10.17592/001.2024110517|Original Data Marine biology