Abstract
This sampling-event dataset documents Antarctic krill, Euphausia superba Dana, 1850, collected using ROV SuBastian aboard R/V Falkor (too) during expedition FKt241214. Sampling took place at a hydrothermal vent site at Hook Ridge in Bransfield Strait (dive S0770) and a comparative non-vent site in Antarctic Sound (dive S0767). The expedition interval reported in the Supplementary Materials is 15 December 2024–3 January 2025.The dataset contains 39 individually identified krill: four from Hook Ridge and 35 from Antarctic Sound. Specimen measurements comprise body length, sex/developmental stage, carbon and nitrogen mass fractions, stable isotope values (δ13C and δ15N), and elemental concentrations for subsets of individuals. Four event-level environmental temperature summaries from the paper describe mean bottom temperatures at both sites, the maximum near-vent water temperature at Hook Ridge, and a lower bound for Hook Ridge vent-fluid temperature.The data are organized into three Event records (one parent cruise and two sampling dives), 39 Occurrence records and 325 eMoF records. They support comparison of krill demographics and biochemical signatures between vent and non-vent habitats. They accompany the study “Deep Sea hydrothermal vent habitats support gravid Antarctic krill” (Bernard et al. 2026). Microbial sequence data, Quest Caldera observations and video-based abundance estimates are not included in this dataset.Please follow the guidelines from the SCAR Data Policy (SCAR, 2023) when using the data.