Antarctic Krill Use 2 Vent Fields for Feeding and Residence at Depths Beyond 1,000 Meters
Updated
Updated · Nature.com · Sep 14
Antarctic Krill Use 2 Vent Fields for Feeding and Residence at Depths Beyond 1,000 Meters
1 articles · Updated · Nature.com · Sep 14
Summary
Researchers found reproductively active female Antarctic krill feeding and residing at deep-sea hydrothermal vents, overturning the long-held view that the species mainly occupies the upper 150–200 meters.
Four gravid females collected at Hook Ridge around 1,100 meters carried spermatophores and showed gut microbes, carbon-isotope signatures, and trace-metal profiles consistent with repeated feeding on chemosynthetic vent microbes.
ROV footage from Quest Caldera confirmed the behavior was not isolated, recording gravid females across a 2.57-km survey grid and estimating 1,991 individuals near vents at 690–990 meters.
The study says vent habitats may offer warmer water, year-round food, and essential metals such as zinc and manganese that could aid reproduction and embryo development.
Because Antarctic krill underpin Southern Ocean food webs and support a major fishery, the authors say vent-associated regions should be considered in Antarctic marine protected area planning.
Are surface climate changes driving pregnant Antarctic krill into the toxic depths of hydrothermal vents, or is this an ancient survival strategy?
Could the secret to Antarctic krill survival and the booming krill oil industry actually lie hidden within extreme deep-sea hydrothermal vents?
Antarctic Krill Found Thriving at Deep-Sea Hydrothermal Vents: The 2026 Discovery That Redefines Southern Ocean Ecology, Fisheries, and Conservation
Overview
In September 2026, scientists used advanced deep-sea technology to discover Antarctic krill living and feeding over 3,000 feet deep at hydrothermal vents. These vents provide warmth and chemosynthetic bacteria, allowing gravid female krill to gain vital nutrients and an energetic boost for egg development. Krill move between these deep-sea habitats and shallower waters, creating a nutrient loop that supports surface phytoplankton and connects deep-sea energy to marine mammals and seabirds. However, rapid climate change and commercial fishing threaten these newly discovered reproductive habitats, highlighting urgent challenges for conservation and the need for better deep-sea protection and monitoring.